Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (5): 84-89.doi: 10.3969/j.issn.1000-565X.2014.05.013

• Traffic & Transportation Engineering • Previous Articles     Next Articles

Influence of Crossbeam Yielding on Transverse Seismic Response of Cable- Supported Bridge

Xia Xiu- shen1,2 Li Jian- zhong1 Xu Yan1 Ji Dong- bing1   

  1. 1.College of Civil Engineering,Tongji University,Shanghai 200092,China; 2.School of Civil Engineering,Lanzhou JiaotongUniversity,Lanzhou 730070,Gansu,China
  • Received:2013-04-03 Revised:2013-12-19 Online:2014-05-25 Published:2014-04-01
  • Contact: 李建中(1963-)，男，博士，教授，主要从事桥梁抗震研究． E-mail:lijianzh@tongji.edu.cn
  • About author:夏修身(1978-)，男，博士后，副教授，主要从事桥梁抗震研究．E-mail:xiaxiushen@mail．lzjtu．cn
  • Supported by:

    国家 “973” 计划项目(2013CB036302);国家自然科学基金资助项目(51278371， 51368033)

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Abstract:

The intensity of future earthquake is unpredictable.The tower in transverse direction of cable- stayedbridge may act in a nonlinear way in ultra- fortified earthquakes.In this paper,by taking a long- span cable- stayedbridge as the research object,a finite element model is established to analyze the transverse seismic response of ca-ble- stayed bridge under the action of strong earthquake.Then,the seismic capacity- to- demand ratio is introduced tojudge whether the crossbeam is yielding.Moreover,a fiber section beam element is employed to simulate the ine-lastic behavior of crossbeam,and the influence of crossbeam yielding on the transverse seismic response of cable-stayed bridge is finally investigated in detail.The results show that (1) as the seismic capacity- to- demand ratio ofcable- stayed bridge crossbeam is relatively small,a ductility design for crossbeam may be more reasonable; (2) theseismic axial force of crossbeam changes significantly,which may greatly affect the yielding moment; and (3) asthe yielded crossbeam greatly affects the transverse seismic response of cable- stayed bridge,the increasing bendingmoment of tower base should be considered in the design process.

Key words: cable- stayed bridge, crossbeam, seismic response, fiber section beam element

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