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| Aseismic system of medium-span cable-stayed bridge in strong earthquake area |
| HUANG Yongfu, MA Jian, XIA Zhixian |
| Yunnan Transportation Planning and Design Institute Co Ltd, Kunming 650041, China |
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Abstract In high earthquake intensity areas, selecting a reasonable seismic constraint system has good effects on optimizing seismic performance of medium-span cable-stayed bridges. Cable-stayed bridge with a span of 100m+240m+100m is used as engineering case, and modal analysis and nonlinear time-history analysis of four different transverse constraint systems are carried out, then the effects of three constraint schemes of the transition pier on overall seismic performance of bridge are also compared. The results show that the structural seismic response is greatly reduced when elastic-plastic constraint device is installed in the transverse direction of bridge. In addition, the sensitivity analysis of mechanical parameters Fy ,K1 and K2 of elastoplastic constraints is carried out, trend of structural seismic response is obtained and suggestions for parameter design are given. Based on the theoretical analysis, the design idea of three anti-seismic defense lines is proposed for the engineering application of elastoplastic constraint devices under different seismic levels, which provides a reference for the selection of seismic systems for medium-span cable-stayed bridges.
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Received: 10 April 2019
Published: 28 July 2020
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