大跨度上承式钢管混凝土拱桥受力性能分析

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Abstract Research purposes: To methodically master the mechanical performance of deck type concrete-filled steel tube arch bridge under the complex construction conditions of the coexistence of large temperature difference, canyon wind, and high earthquake areas in northwest China, a highway arch bridge of the same type with a clear span of 400 meters is used as an example. Based on present design specifications, a three-dimensional bar system finite element model is established using the unified modulus approach, and a thorough and methodical investigation and computation of the combined working conditions of the static performance, stability, and dynamic characteristics and seismic performance have been carried out in order to provide guidance for the design of comparable bridges.
Research conclusions: (1)The crosswind effect at the arch foot is prominent, and the temperature effect is greater than the car load effect.(2)The combined force of bi-directional eccentric tension and compression is in the control design state of single chord, and the arch crown is the weak position of the truss arch rib bearing capacity.(3)The fatigue performance and bearing capacity are easily met when the components, such as web members, transverse braces, and horizontal connections, have good matching with the chord structure.(4)The temperature and creep camber to lane loadis much larger.(5)Under material, geometric, and dual nonlinearity, the main arch ring's stability drops by 5.5%, 11.9%, and 17.1%, respectively.(6)The frequency value is low and the vibration mode is rather dense. Out of plane bending torsional vibration, which possesses multidirectional and multiangle coupling features, is the primary vibration mode.(7)The time history analysis results show that arch bridges function well seismically since they are higher than the response spectrum analysis results but lower than the static conditions results.(8)The deck type steel tube concrete arch bridge has a good mechanical performance under complex construction conditions.

Key words： CFST arch bridge static performance stability nonlinearity dynamic characteristics earthquake resistance

Received: 26 April 2022

PACS:

U448.17

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	LI Zite
	WANG Genhui
	FAN Jiang
	WU Weihong
	LI Xiaozhong

Cite this article:

LI Zite,WANG Genhui,FAN Jiang, et al. Mechanical Performance Analysis of Long-span Upper-loaded CFST Arch Bridge[J]. Journal of Railway Engineering Society, 2024, 41(1): 32-38.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2024/V41/I1/32

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