弹性连接失效对大跨斜拉桥地震响应影响

发布时间：2018-05-01 22:38

  本文选题：弹性连接 + 失效　； 参考：《振动.测试与诊断》2017年04期

【摘要】：首先,以附加弹性连接(elastic connection,简称EC)的线性单自由度(single degree of freedom,简称SDOF)系统为例,研究弹性连接的失效对系统动力时域响应的影响;其次,以一座半漂浮体系的大跨斜拉桥在两组地震作用下的地震响应为例,研究塔(墩)梁间弹性连接失效对大跨斜拉桥结构地震响应的影响。研究表明:弹性连接失效对大跨桥梁动力响应存在重要影响,动力响应存在明显差异;考虑弹性连接失效后,如果在地震中弹性连接出现失效,大跨斜拉桥加劲梁地震内力明显小于未考虑弹性连接失效的情况,但加劲梁和塔顶纵桥向位移会有所增加;应当设置合理的弹性连接及其失效限值,保护主体结构在地震中的安全。
[Abstract]:Firstly, the effect of the failure of elastic connection on the dynamic time domain response of the system is studied by taking the linear single degree of freedom-of-freedom (SDOF) system with elastic connection as an example. Taking the seismic response of a long-span cable-stayed bridge with semi-floating system under two groups of earthquakes as an example, the effect of failure of elastic connection between tower (pier) beams on the seismic response of long-span cable-stayed bridge structure is studied. The results show that the failure of elastic connection has an important effect on the dynamic response of long-span bridge, and the dynamic response is obviously different, considering the failure of elastic connection, if the elastic connection fails in earthquake, The seismic internal force of stiffened beam of long-span cable-stayed bridge is obviously smaller than that of the failure of elastic connection, but the displacement of stiffened beam and tower top longitudinal bridge will increase, and the reasonable elastic connection and failure limit value should be set up. To protect the safety of the main structure in the earthquake.
【作者单位】： 上海建工(集团)总公司;东南大学土木工程学院;北京建筑大学土木与交通工程学院;
【基金】：国家自然科学基金资助项目(51408355)
【分类号】：U442.55;U448.27
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本文编号：1831305