采用拉索减震支座的斜拉桥地震易损性分析
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同济大学,同济大学,同济大学,同济大学

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TU312.1

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国家自然基金(50978194,90915011,51278376);西部交通运输部科技项目(20113185191410)


Seismic Fragility Analysis of Cable stayed Bridges Retrofitted with Cable sliding Friction Aseismic Bearing
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Tongji University,Tongji University,Tongji University,Tongji University

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    摘要:

    利用易损性方法对斜拉桥设置拉索减震支座与否进行了细致的研究,并得到了塔底弯矩和墩梁位移的易损性曲线.通过基于概率的分析研究表明,拉索减震支座能够有效地限制墩梁的相对位移,同时还能够适当地减小塔底的弯矩.对斜拉桥安装拉索减震支座的减震机理进行探讨表明,依靠摩擦增加阻尼以及通过拉索改变地震力的传力路径是减小斜拉桥地震响应的主要方式.

    Abstract:

    Seismic response analysis was carried out for the cable stayed bridge with or without cable sliding friction aseismic bearing (CSFAB) on the basis of the probabilistic seismic demand model (PSDM). Fragility curves were obtained for both the bending moment of the tower and the pier girder relative displacement. A comparative study of the fragility curves shows that the CSFAB can reduce the pier girder relative displacement effectively and mitigate the bending moment at the tower base as well. The investigation result of the aseismic mechanism of the cable stayed bridges reveals that adding damping from friction and changing seismic force transferring path by the elastic cables are two main reasons for reducing seismic response of the cable stayed bridges.

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钟剑,庞于涛,沈国煜,袁万城.采用拉索减震支座的斜拉桥地震易损性分析[J].同济大学学报(自然科学版),2014,42(3):0351~0357

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  • 收稿日期:2013-01-07
  • 最后修改日期:2013-11-23
  • 录用日期:2013-10-28
  • 在线发布日期: 2014-03-10
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