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2022 Vol. 39, No. 2 Published: 2022-02-15

Main Line: Survey and Design Main Line: Engineering Geology and Subgrade Main Line: Railway and Rail Main Line: Bridge Engineering Main Line: Electrification Engineering Main Line: Research on Railway Networks Terminal, Station yard and Building

Main Line: Research on Railway Networks

	1	Research on the Implementation Plan of the Main Railway Corridor of the New Western Land-sea Corridor
		WEI Changxin, LV Xin
		Research purposes: Accelerating the construction of the new western land-sea corridor is of important realistic and profound historical significance in giving full play to the role of the western region as a link between the Silk Road Economic Belt and the 21st-Century Maritime Silk Road, deepening the land-sea two-way opening-up, strengthening measures to bring about a new pattern of western development, and promoting the quality development of regional economy. To bring full play to the backbone role of railway in land transportation and its green and low-carbon advantages and make it actively integrate into and serve the construction of the new western land-sea corridor, we conducted the research, aiming to better serve the national strategy of the new western land-sea corridor. Research conclusions: (1) The capacity expansion and transformation of Guiyang-Liuzhou railway and Qinzhou-Qinzhou Port railway and the construction of Chongqing-Guiyang high-speed railway will be completed by 2030. (2) After the expansion and reconstruction of the former three railways, the relevant road network will meet the transportation demand in 2035 based on the existing road network. (3) The capacity expansion and transformation of Dazhou-Chengdu railway will be completed before 2045. The orderly implementation of the plan contributes to the construction of the new western land-sea corridor, making the main corridor clear, fast and high-quality. (4) The research can provide useful reference for the planning and implementation of similar backbone corridor in China.
		2022 Vol. 39 (2): 1-6 [Abstract] ( 3383 ) HTML (0 KB) PDF (419 KB) ( 1955 )

	7	Research on the Evaluation of Rail Transit Network Planning in Urban Agglomeration
		HU Bisong, XIAO Chang
		Research purposes: The evaluation of rail transit network planning in urban agglomeration is the main basis for the selection of planning schemes. This paper constructs a scientific, objective and universal evaluation index system and evaluation method to provide theoretical guidance for the development of urban agglomeration rail transit. Through the establishment of an evaluation index system with 5 criterion levels and 23 index levels including line network structure, operational effects, social benefits, urban coordination, and difficulty of implementation, a combination of gray correlation method and information entropy weight method is given to determine the index weight, the gray fuzzy multi-level evaluation model is constructed to comprehensively evaluate the target level, criterion level, and index level. Research conclusions: (1) The case shows that the planning evaluation system and method proposed in this paper are scientific and feasible. (2) The degree of influence of rail transit network planning criteria level is line network structure, urban coordination, operational effects, social benefits and difficulty of implementation. (3) The research results are applicable to the evaluation of the quality of urban agglomeration rail transit network planning, and can provide decision-making reference for urban agglomeration rail transit planning and construction.
		2022 Vol. 39 (2): 7-13 [Abstract] ( 3883 ) HTML (0 KB) PDF (385 KB) ( 1935 )

Main Line: Survey and Design

	14	Research on the Route Selection of High-speed Railway Based on Analytic Hierarchy Process
		TANG Dongdong
		Research purposes: With the rapid development of high-speed railway construction, there are many schemes about route selection of railway and many factors affecting route selection of railway, such as complicated engineering geological conditions and huge investment. The traditional route selection comparison generally takes the economic index as the main influence factor to measure the route selection. This paper analyzes the main factors that affect the route selection based on the Nanning-Shenzhen high-speed railway project, established the index system of decision-making for the route selection of Nanning-Shenzhen high-speed railway based on analytic hierarchy process, and considering the influence of many factors on the decision-making level, establishes the decision-making model of the route selection of high-speed railway based on analytic hierarchy process (AHP). Research conclusions: (1) Comparison and selection of route scheme is an important content of design of railway line selection.When we conduct the comparison and selection of route scheme, the influencing factors such as project investment,difficulty of project implementation, and project risk should be considered synthetically in order to make sure the selected line scheme optimal.(2) The recommended conclusion of using analytic hierarchy process is the same as the route selection recommended scheme of Nanning-Shenzhen high-speed railway. (3) The route selection model of high-speed railway based on analytic hierarchy process can make up for the shortcomings of subjectivity and singleness in general route selection of high-speed railway, and the decision-making model is practical, reasonable and scientific. This paper can provide reference for the route selection of similar projects.
		2022 Vol. 39 (2): 14-18 [Abstract] ( 3878 ) HTML (0 KB) PDF (815 KB) ( 2012 )

	19	Research on the Scheme of Reserving Double Track for Single Track of Quzhou-Ningde Railway
		QIN Guoqiang
		Research purposes: In order to meet the demand of passenger and freight volume and reserve long-term development conditions, part of the railways will be built as single track in the near future, and double track construction conditions will be reserved. The second track will be built at the right time after the railway is put into operation. The single track reserved double track railway needs to coordinate the short-term and long-term transportation demand of each section, the project and implementation conditions of first track and second track, and reasonably determine the station distribution, reserved line position of second track and the recent simultaneous implementation of the project. Through the study of Quzhou-Ningde railway line scheme, this paper discusses the design method of single track reserved double track railway. Research conclusions: Single track reserved double track railway not only needs to design the first track, but also needs to reserve the conditions of the second track. (1) It is necessary to define the scope of simultaneous implementation of the second track. According to the difficulty degree of tunnel, bridge and station engineering of the first track, the left and right sides of the second track are determined by comprehensive comparison. (2) We should try to reduce the times of side changing, and choose the place of side changing according to the specific situation. (3) During the pre design of reserved second track, it is necessary to minimize the simultaneous implementation of the second track and the project shall be reserved when necessary. (4) This study can provide reference for the design of similar single track reserved double track railway.
		2022 Vol. 39 (2): 19-23 [Abstract] ( 2867 ) HTML (0 KB) PDF (507 KB) ( 1979 )

	24	Disaster-causing Mechanism of Active Faults and Its Application in Route Selection in CZ Railway
		BI Qiang, LI Wei, LIN Shijin
		Research purposes: The plate activity along the CZ railway is intense and the structure is developed. There are 11 Holocene active faults distributed along the section from CZ railway, with 11 lines passing through them. More than 50% of the lines are located in the earthquake intensity area of 8 degrees or above. Seismic activity in the region is frequent and intense, with 354 earthquakes of magnitude 4.7 or above recorded in history, and the largest earthquake was Chayu and Medog earthquakes of magnitude 8.6 in Tibet on August 15, 1950, which brought unprecedented challenges to the selection of route schemes and disaster prevention and mitigation. Therefore, it is necessary to systematically study the disaster-causing mechanism of active faults. Research conclusions: (1) The active faults have five disaster-causing mechanisms such as "upper plate effect, distance effect, terrain effect, persistent effect and follow-up effect". (2) Railway route selection in high-intensity earthquake areas should adopt the countermeasures of "avoiding active plate, away from faults, avoiding dangerous slopes and crossing directly". (3) The engineering setting shall follow the principles of "stabilizing stratum, simplifying engineering, first selecting tunnel and leave some leeway", etc. (4) The conclusion can provide reference for railway survey, design and engineering construction in Yunnan-Tibet, China-Nepal and other complex and dangerous mountainous areas.
		2022 Vol. 39 (2): 24-29 [Abstract] ( 3074 ) HTML (0 KB) PDF (1004 KB) ( 1933 )

	30	Research on the Scheme of Line Position and Engineering Countermeasures of Tunnel in High Altitude and Complex Strata
		DUAN Rongcheng
		Research purposes: In recent years, the attention has been paid on the problem of complex strata during the process of railway construction in Western China. The widely distributed Triassic slate and Neogene sandstone strata greatly increase the difficulty of tunnel construction. Based on the newly-built Ganqing tunnel of Xining-Chengdu railway as an example, the scheme of line position and engineering countermeasures of super long tunnel in high-altitude complex stratum were studied, and the stratigraphic distribution model of Guashize basin was built based on detailed geological exploration. Research conclusions: (1) According to geological conditions and similar engineering experience, the principle of site selection is proposed. In this study, the advanvement and disadvancement of different schemes are analyzed and compared in many aspects, i.e., construction difficulty and risk, auxiliary tunnel setting conditions, line setting conditions and project investment, results indicate the bypass scheme is best. (2) Combined with the difficulties in engineering construction, the key engineering problems such as tunnel construction scheme, construction scheme, tunnel structure design in high ground stress and large deformation stratum are studied respectively, and the corresponding engineering countermeasures are proposed. (3) The research results can provide reference for the railway tunnel survey and design in similar complex strata.
		2022 Vol. 39 (2): 30-35 [Abstract] ( 2350 ) HTML (0 KB) PDF (1335 KB) ( 1962 )

Main Line: Engineering Geology and Subgrade

	36	Application of Optimizing Stratigraphic Boundary in Improving the Quality of Soft Foundation Exploration
		PENG Guoxi, JIANG Liangwen, FAN Aimin, ZHA Jun
		Research purposes: Soft ground is one of the most common special rock and soil in the construction of the hill road and railway construction in south China. In construction, if soft ground is treated improperly or not completely, it often leads to the failure of the upper retaining wall, anti-slide pile and other support measures, which affect project construction schedule and late operation safety, and this problem of soft foundation change between hills is becoming increasingly prominent. This paper first analyzes the types of soft foundation between hills and its damage types, discusses the causes of soft foundation change including "exploration equipment, weather" and so on, and establishes a series of principles to optimize the stratigraphic boundary of soft foundation. Research conclusions: (1) According to the organic matter content, porosity ratio, natural water content and other indexes, the soft foundation between hills can be divided into seasonal soft soil and silty soft soil. (2) The comprehensive means of "drilling + static exploration" is adopted to survey. The depth of soft foundation should be determined by drilling, while static exploration is mainly used to determine the mechanical parameters such as the bearing capacity of soft foundation. (3) A series of methods to optimize the layer boundary of soft base, such as the principle of avoiding drawing ′lens′, the principle of maximizing the soft foundation of gully heart, and the principle of the most unfavorable soft foundation of steep slope, are established. (4) It is of guiding significance to improve the survey quality of soft foundation between hills in south China and reduce the change of soft foundation in the construction stage.
		2022 Vol. 39 (2): 36-40 [Abstract] ( 3124 ) HTML (0 KB) PDF (700 KB) ( 1908 )

	41	Exploration on the Key Control Parameters of High Pressure Jet Grouting Rectification Technology
		CHEN Zhan, ZHU Jiangjiang, PENG Zhipeng, ZHOU Yong, CHEN Kan
		Research purposes: A large number of practices have proved that it is a feasible technical measure to rectify the deviation of bridge by high pressure jet grouting. Through the analysis of the principle of bridge correction by foundation treatment, the theoretical model of soil erosion and damage by cement slurry jet was established. Based on the high pressure jet theory, taking maximum correction amount and minimum rebound amount, and the best correction effect as the basic solution conditions, the expression of key control parameters of rectification construction was derived, the best rotation and lifting speed of drill pipe, and the outlet pressure and the water-cement ratio of the cement slurry nozzle were determined, and were verified with the actual correction effect of typical project on site. Research conclusions: (1) When the nozzle diameter is fixed, the cement slurry jet power is proportional to the 3/2 power of the nozzle outlet pressure and inversely proportional to the 1/2 power of the cement slurry density, increasing the grouting pressure can effectively increase the jet power, and achieve a better correction effect; (2) Taking the formation conditions of construction case, the best rotation and lifting speed of drill pipe are 25.1 r/min and 16.3 cm/min respectively, the nozzle outlet pressure of the cement slurry should be 5 MPa, and the water-cement ratio should be controlled at 0.8 ∶1.0; (3) The parameters calculated were used for actual project, a good rectification effect was achieved, which indicates that the theoretical model and calculation parameters established can be used to guide the actual construction; (4) The research results can provide practical parameters for bridge correction by foundation treatment, and achieve the optimal rectification effect.
		2022 Vol. 39 (2): 41-45 [Abstract] ( 2433 ) HTML (0 KB) PDF (828 KB) ( 2140 )

Main Line: Railway and Rail

	46	Research on the Influence Factors of Expansion and Contraction Force of CWR on 100 m Simply Supported Steel Truss Bridge
		XU Hao, LIN Hongsong, TIAN Chunxiang, CAI Wenfeng
		Research purposes: Ballastless track continuous welded rails (CWR) is used on 100 m simply supported steel truss bridge of a mixed passenger and freight railway. In order to study the expansion and contraction force and influence factors of CWR on 100 m simply supported steel truss bridge, a track-bridge-piers spatial finite element model is established, and the influence of design parameters such as number of bridge spans, the longitudinal stiffness of the pier, the layout of track resistance and bridge support on the expansion and contraction force of CWR are researched. Research conclusions: (1) The rail expansion and contraction force increases with the increase of simply supported steel truss spans. For a multi-span 100 m simply supported steel truss bridge, only 8 spans can be taken for calculation. (2) With the increase of longitudinal stiffness of simply supported steel truss pier, both rail expansion and contraction force and pier force of simply supported steel truss bridge increase. In order to reduce the rail expansion and contraction force and pier force, the longitudinal stiffness of simply supported steel truss should not be too large. (3) The rail expansion and contraction force could be reduced by 52.95% after small resistance fasteners laid on the simply supported steel truss. (4) In order to reduce the rail expansion and contraction force and pier force of simply supported steel truss, the adjacent simply supported concrete box girder and simply supported steel truss should adopt the support arrangement in the same direction. (5) The research results can provide references for the design of continuous welded rail on large-span simply supported steel truss bridge.
		2022 Vol. 39 (2): 46-51 [Abstract] ( 3024 ) HTML (0 KB) PDF (528 KB) ( 1929 )

	52	Research on the Data Cooperative Relationship between Dynamic and Static Inspection of High-speed Railway Operation
		SHI Debin, YANG Huaizhi
		Research purposes: During the operation of high-speed railway, it is necessary to carry out periodic and random track detection and foundation deformation measurement in order to evaluate and grasp the stable and safe state of the line at any time. It is an important part of high-speed railway transport control system. In the field of high-speed railway, opinions on the measurement method, measurement accuracy and evaluation index of track are not consistent all the time, and there are many research projects on track measurement equipment and data processing in the industry. In this paper, the linear properties, linear composition and expression, and the derivation of measurement accuracy of the track are discussed, and the principle and method of using track alignment detection data are presented. Research conclusions: (1) The manifestation, observation method and disease degree control index of foundation deformation are studied, and the principle of "moving inspection as the main and static inspection as the repair" is put forward. On the premise of satisfying the accuracy and range of track control network required by track maintenance, the track control network retest and track static inspection are carried out. (2) The measuring datum of linear coordinate points in orbit space is the track control network with internal and external precision meeting the requirements, and the starting datum can be coordinate control or scale datum + direction datum combined control. (3) To determine the scheme and timing of maintenance of track and infrastructure, it is necessary to reasonably analyze and weigh the degree of impact and primary and secondary factors of high-speed railway lines. (4) The research results have a reference for the track detection and maintenance work.
		2022 Vol. 39 (2): 52-55 [Abstract] ( 3399 ) HTML (0 KB) PDF (340 KB) ( 1956 )

	56	Long-term Temperature Gradient Test of Ballastless Track on Bridge-subgrade Transition Section
		SU Chengguang
		Research purposes: In order to reduce the damage of warping and cracking of the ballastless track and ensure the safe and stable operation of the high-speed railway, the one year temperature gradient test of ballastless track on Shanghai-Hangzhou high-speed railway bridge-subgrade transition section was conducted. The temperature gradient distribution and probability distribution of track slab and concrete roadbed are statistically analyzed. Research conclusions: (1) The temperature gradient in the upper track slab is significantly larger than that in the whole track slab. Hence, the temperature gradient in the upper track slab should be chosen for track safety design. (2) The probability of negative temperature gradient in the track slab is greater than the positive temperature gradient. The major temperature gradient range is -30 ℃/m~0 ℃/m for two thirds of one year. (3) The temperature gradient range of concrete roadbed is much smaller than that of the track slab, and its major range is -4 ℃/m~4 ℃/m. (4) The probability distribution of the track slab and the concrete roadbed temperature gradient obeys the exponential function distribution. (5) The research results can provide a theoretical basis for the design, construction and maintenance of ballastless track applied on bridge-subgrade transition section.
		2022 Vol. 39 (2): 56-61 [Abstract] ( 3709 ) HTML (0 KB) PDF (753 KB) ( 1919 )

Main Line: Bridge Engineering

	62	Research on the Design of Extradosed Bridge Using Swivel Construction Method on Small Radius Curve
		ZUO Jiaqiang
		Research purposes: The (120 + 120) m double track extradosed bridge is used to cross over Qingdao-Jinan passenger dedicated line and Dazheng road in a grand bridge of Handan-Jinan railway to Qingdao-Jinan railway connecting line project. The cable-stayed bridge is located on a small radius curve with R=800 m. This bridge adopts swivel construction method, whose swivel tonnage reaches 25 000 tons. In design process, the spatial beam element model, spatial beam lattice model and spatial solid element model are used for structural FEA analysis. The complex spatial stress condition is deeply analyzed, and reasonable structural measures are adopted to ensure the structural safety. Research conclusions: (1) Calculation results reliability of the main girder can be guaranteed by using spatial beam element for FEA analysis and considering the influence of curve and multiple webs uneven stress via spatial beam lattice model. (2) Measures such as setting upper beam in the tower, setting stay cable transverse eccentricity in the tower and setting vertical prestressed tendon at the lower part of the tower are adopted to effectively solve the problem of tower transverse stress condition under stay cable radial force. (3) This bridge adopts the sixth generation cable saddle, which realizes two-way anti-sliding through one-sided bidirectional frictional anchorage device, whose frictional force is much clearer and more convenient for construction. (4) 1.4 m and 1.0 m eccentricities to the inner side of the curve are respectively set for spherical hinge and rotary table, ensuring the structural balance during rotation and improving the stress condition of foundation. (5) The research results have reference significance for similar bridges design in the future.
		2022 Vol. 39 (2): 62-67 [Abstract] ( 3301 ) HTML (0 KB) PDF (622 KB) ( 2054 )

	68	Research on the Design of High-speed Railway Turnout Continuous Beam Bridges Based on Converting Simply Supported Beams into Continuous Beam
		XU Bin
		Research purposes: In order to overcome the shortcomings of the cast-in-place method with full support, the technology of converting simply supported beam into continuous beam was applied for the first time in the construction of high-speed railway turnout continuous beam bridges. By construction simulation with finite element method, and comparing actual cost, construction period of Baoji-Lanzhou High-speed Railway, this paper aimed to verify the mechanical rationality and economic superiority of the proposed construction method, optimize the closing parameters, and give the engineering application suggestions. Research conclusions: (1) Compared with completely simply supported beam system, the passing stiffness of the simply-supported-to-continuous beam system is greatly improved, which can meet the deformation limit of the turnout structure on the bridge. (2) Compared with the completely continuous beam system, the proposed system has completed most of the shrinkage and creep and uneven settlement during the beam erection process. So the additional deformation and secondary internal force caused by creep and settlement are greatly reduced after system conversion, and mechanical properties of the bridge become stronger. (3) The simply-supported-to-continuous construction method can achieve huge benefits in terms of cost and construction period, by moving moulds casting method, precast-in-factory method, and avoid cast-in-place construction. (4) In the simply-supported-to-continuous construction, it is beneficial to reduce structural displacement and secondary internal forces by anchoring the closure steel beam downwards and symmetrical closure of side span first then mid span. (5) The research results can provide an empirical reference for the construction of a large number of high-speed railway turnout continuous beam bridges in the future.
		2022 Vol. 39 (2): 68-72 [Abstract] ( 3747 ) HTML (0 KB) PDF (2068 KB) ( 2116 )

	73	Bending Test and Performance Evaluation of Medium and Low Speed Maglev Standard Box Girder
		ZHAO Zhijun
		Research purposes: Maglev trains have extremely high requirements on the rigidity and strength of the box girder, but there is no relevant test on the crack resistance of the maglev box girder. In order to evaluate the mechanical performance of the medium and low speed maglev box girder, this paper carried out a bending crack resistance static load test on the Changsha 25 m maglev standard box girder. By testing the displacement, stress and crack development of the standard box girder under load, the strength, stiffness and crack resistance of precast beams were evaluated in actual working conditions, to provide test basis for the normal operation of maglev trains, and provide data support for similar projects. Research conclusions: (1) The girder is in the elastic state before the cracking, and the stiffness can meet the design requirements. (2) The measured cracking load is 258.9 kN, which is higher than the theoretical value. It can be evaluated as the crack resistance of the full prestressed girder. (3) The strain distribution of the cross section of the girder before the crack is basically conformed to the assumption of the flat section, and the difference between the measured neutral axis and the theoretical value is very small. (4) The cross-section strain of box girder is obviously redistributed after cracking. With the increasing of the load, the width of cracks in the mid span increases. When loading up to 372.2 kN, the maximum crack width of the box girder is 0.053 mm. (5) The research in this paper shows that the mechanical performance of the 25 m maglev standard box girder meets the requirements of the specification, and its structure and design can be popularized and applied in medium and low speed maglev projects.
		2022 Vol. 39 (2): 73-78 [Abstract] ( 2321 ) HTML (0 KB) PDF (955 KB) ( 1906 )

	79	Reasonable Analysis Method of Steel-concrete Post-pouring Area of Straddle Monorail
		ZHOU Shuai, YU Peng, ZENG Yongping, XU Shengqiao, NIE Jianguo
		Research purposes: A straddle monorail project is the first project using the continuous beam turned from simply supported beam in China. The post-pouring area is the combined cross-section form of "concrete beam with overlying steel plate", and its longitudinal rebars are connected by a kind of "auxiliary short rebar" whose binding length is lower than that required by the specification. The structure above is obviously different from the conventional structure. To clarify the mechanical behavior of this area, the numerical simulations of various related FEM theories were carried out under different parameters. Its bearing capacity and crack resistance were emphatically studied, and reasonable analysis methods were given. Research conclusions: (1) Comparing to the dispersive crack and fracture mechanics model, the discrete crack model is the most reasonable method. (2) Comparing to the model using the rebar-concrete solid element or the simple truss element, the model with implantable interface element is the most reasonable method. (3) The rebar stress decreases with the increase of diameter, but its stress safety factor increases first and then decreases, hence a larger diameter is not necessarily better. (4) The modeling method and crack formula proposed in this paper can guide the design of this kind of structure and reduce the workload of FEM analysis.
		2022 Vol. 39 (2): 79-84 [Abstract] ( 2332 ) HTML (0 KB) PDF (893 KB) ( 1953 )

Main Line: Electrification Engineering

	85	Exploration on the Speed-upgrade Improvement Strategy of High-speed Railway Catenary
		YANG Jia, LU Xiaobing, GUAN Jinfa
		Research purposes: Compared with the newly built high-speed railway, the catenary system of the existing and operational high-speed railway is more difficult and complex in the design, construction and operation of speed-upgrade improvement, with strong system correlation, variable parameters, difficult demonstration, high construction and operation risk, and lack of systematic and standard methods and ideas. Based on the example of the speed-upgrade improvement project from 300 km/h to 350 km/h in the passenger transport line between Chengdu and Chongqing, this paper comprehensively analyzed the difficulties and challenges faced in the project. From the aspects of the feasibility analysis, system performance improvement, equipment performance, construction safety and quality improvement, construction operations process and engineering inspection, the requirements and corresponding strategies of the whole process before, during and after the speed improvement were studied and put forward respectively, forming the technical route of the speed-up improvement of the high-speed catenary, and providing ideas and templates for the formation of the complete technical system of the existing and operational high-speed catenary. Research conclusions: (1) Based on the service characteristics of the catenary, the difficulties and challenges faced are put forward. (2) Based on the target demand and operation status, the technical routes are established for the speed-up improvement of the existing catenary. (3) The improvement strategy is put forward in the design, construction and operation stage. (4) The research results can provide guidance for the speed-upgrade construction of rail transit.
		2022 Vol. 39 (2): 85-89 [Abstract] ( 2309 ) HTML (0 KB) PDF (400 KB) ( 1996 )

	90	Research on the Protection Configuration of Traction Substation in Bilateral Interconnected Power Supply Mode
		WANG Jilai
		Research purposes: In order to solve the problems of train deceleration, power loss, overvoltage and power supply reliability caused by the phase splits of electrified railways, especially mountainous electrified railways, a bilateral interconnected power supply system was proposed, so that two adjacent traction substations can be connected to each other. Through connection between the groups, the in-phase power supply of the catenary within the group range was realized, which provided conditions for canceling the phase splits. However, there were significant differences between the protection configuration scheme of traction substations under the bilateral interconnected power supply mode and the unilateral power supply mode, which had an important impact on the main wiring form and operation mode of the traction substation and the reliability of the traction power supply system. In this paper, relied on the bilateral interconnected power supply test project, by 110 kV traction substation as an example, from the structural characteristics of the bilateral interconnected power supply system, the protection configuration scheme of the traction substation was studied. Research conclusions: (1) In the bilateral interconnected power supply mode, the longitudinal protection was used on the feeder of the traction substation. (2) In the bilateral interconnected power supply mode, an independent 27.5 kV bus differential protection was used in the traction substation. (3) In the bilateral interconnected power supply mode, the incoming line of the traction substation should be combined with the local substation to set up the incoming line optical fiber differential protection. (4) The research conclusions can provide a theoretical basis for the engineering application of bilateral interconnected power supply technology.
		2022 Vol. 39 (2): 90-95 [Abstract] ( 3199 ) HTML (0 KB) PDF (540 KB) ( 1947 )

Terminal, Station yard and Building

	96	Research on the Performance-based Seismic Design and Joint of Single Column Elevated Station
		GAO Xiujian, LIU Qiang
		Research purposes: To ensure the safety, reliability and economic rationality of single-column elevated station structure seismic design, the performance-based seismic design method is systematically studied. Firstly, the Midas-civil model of the structure is established to study its dynamic characteristics, and the seismic checking calculation of the main stressed components under low-level, medium and high-level earthquakes is carried out. Then, the ABAQUS finite element model of key beam-column joint is established, and the stress state of the joint region under normal service stage and high-level earthquake is studied. Research conclusions: (1) According to the structural characteristics, the seismic performance targets under the building structure code and railway code are set respectively. (2) The results of response spectrum and time-procedure analysis under low-level earthquake show that the maximum interlayer displacement angle meets the performance target requirements; under the medium earthquake condition, the checking results of pier column and cap beam meet the performance target requirements. (3) The results of elastic-plastic time-procedure analysis under high-level earthquake show that the section of pier column members is cracked, but the internal reinforcement does not yield and the hysteresis curve is linear. (4) The finite element analysis of beam-column joint shows that the concrete on the upper surface of the joint is cracked slightly, and the internal reinforcement does not yield under the high-level earthquake condition, which meets the requirements of non-yield under high-level earthquake. (5) The research results can provide reference for the seismic design of elevated station structure.
		2022 Vol. 39 (2): 96-102 [Abstract] ( 2173 ) HTML (0 KB) PDF (875 KB) ( 1917 )