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| The Outer-covered Concrete Construction Scheme Optimization of the Long-span Concrete Arch Bridge with Stiff Skeleton |
| YANG Guo-jing, XU Yong, HUANG Yi |
| （China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China） |
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Abstract Abstract：Research purposes： Long-span concrete arch bridge with stiff skeleton has become the main structure for mountain railway bridges with its high rigidity, strong spanning ability and good adaptability to the mountainous valley. However, the formation of arch ribs needs through a series of system transformation, the mechanical behaviors are very complex. It always needs to control design. Based on the Beipanjiang river bridge on Shanghai-Kunming high-speed railway, the calculation method in construction process of concrete arch bridge and the main influence factors are analyzed, the stress state and control factors of arch rib during construction are studied, the different outsourcing concrete construction schemes are compared and analyzed from the two aspects of horizontal ring and longitudinal section， to provide reference and basis for the design of the similar arch bridge. Research conclusions： (1) With the increasing of section horizontal ring number, the skeleton's stress will be obviously reduced. It shows the number of rings affects the force of arch bridge directly, and we should make sure that the number of rings should not be too little. (2) The longitudinal section number is not the more the better, and the stiff skeleton which is not wrapped by concrete in the working face junction is in a bad condition. (3) The proposed optimization scheme is beneficial to reduce the maximum stress at the top of the upper chord, and avoid the stress mutation at the working face, to achieve the optimization purpose.
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Received: 15 September 2017
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2017, Vol. 34 
