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范立础,王君杰.非一致地震激励下大跨度斜拉桥的响应特性[J].计算力学学报,2001,18(3):358~363
非一致地震激励下大跨度斜拉桥的响应特性
Response characteristics of long-span cable-stayed bridgesunder non-uniform seismic action
  修订日期:1999-07-27
DOI:10.7511/jslx20013073
中文关键词:  斜拉桥 地震动 空间变化 随机响应
英文关键词:cable-stayed bridge,seismic ground motion,spatial variation,random response
基金项目:国家自然科学基金重大项目 (5 9895 41 0 )
范立础  王君杰
同济大学桥梁系!上海200092
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中文摘要:
      基于平衡随机地震动场理论,研究了地震动空间变化,包括行波效应,相干损失和局部场地条件,对大跨度斜拉桥地震响应特征的影响,采用拟激励方法计算结构的随机响应,计算的响应量包括塔顶位移,塔底弯矩,辅助墩底弯矩等,得到的主要结论是:与一致地震激励相比,地震动空间变化可以使斜拉桥的地震反应改变 达40%,仅考虑行波效应可以得到响应的偏于保守的估计值,局部土场地条件的对斜拉桥的地震反应有重要影响,当各塔,墩处的土质条件差异较大时需进行详细的抗震分析。
英文摘要:
      The response characteristics of long-span cable-stayed bridges under seismic action with spatial variation, including traveling effect, coherence loss and local site condition, are investigate in this paper. The pseudo-excitation method is employed to calculate the random response of the bridges, and the conclusions are the follows:(1)the response of the cable-stayed bridges under seismic action with spatial variation differ from those under uniform seicmic action up to 40%, therefore it is necessary to take the spatial variation of the seismic ground motion into account in the seismic design of long-span cable-stayed bridges; (2)traveling excitations is to give the conservative values of the response, compared with those by taking the coherence loss into account; (3)the large differences of the site conditions at the bottoms of the towers and piers of the bridges significantly change the response of the bridges, which should be included in the seismic design of the bridges.
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