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| Study of Plastic Hinge Length in High-speed Railway Bridge Piers |
| SHAO Guang-qiang1, LIU Kai1, JIANG Li-zhong2, KANG Jun-tao1 |
| (1. Wuhan University of Technology, Wuhan, Hubei 430070, China; 2. Central South University, Changsha, Hunan 410075, China) |
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Abstract Abstract：Research purposes： Equivalent plastic hinge length, Lp, is usually used to predict the limit displacements at the top of piers in simplified design under earthquake loading. High- speed railway bridge piers have larger section size and less longitudinal reinforcement ratio. At present, code for seismic design of railway engineering in China has no recommendations for the plastic hinge length of piers, engineers can only refer to the existing empirical formula for seismic design and its applicability is not clear. Based on the pseudo static test data of nine rounded type of high speed railway bridge piers, this paper analyzes the parameters of the plastic hinge length of multiple piers, compares with a variety of design specifications, aims to study and put forward the plastic hinge length formula suitable for high-speed railway bridge piers, for seismic design of bridge piers. Research conclusions： (1) The experimental results matched well with the modified Chang-Mander concrete model in the fibre beam-column element. (2) The pier height and axial compression ratio are the most influencing factors for the development of Lp, and the yield strength and diameter of steel rebar have less effect on Lp. (3) Compared to the existing design equations, the proposed equation predicted Lp in high-speed railway bridge piers well. (4) The research results can be applied to the seismic design and analysis in high-speed railway bridges.
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Received: 26 April 2017
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2017, Vol. 34 
