基于Pushover的近海隔震桥梁性态指标量化分析
发布时间：2019-06-05 10:32
【摘要】：针对目前我国近海隔震桥梁抗震性态指标量化的研究现状,引入基于性态的抗震设计思想,利用Pushover分析方法建立量化指标限值。给出近海隔震桥梁的性态水准合理划分,选取位移延性比和支座剪应变作为量化指标,利用公式法和Pushover法计算量化指标限值。选取3条天然地震波对近海隔震桥梁进行增量动力时程分析,得到结构在不同PGA作用下的位移响应。根据不同强度地震动作用下墩顶位移和支座变形情况,与本文计算的性态指标限值进行比较分析。研究结果表明:对于低墩桥梁,公式法计算量化指标限值相较于Pushover法偏小,采用Pushover法能合理地确定性态指标,可为近海隔震低墩桥梁性态设计和易损性分析提供可行的量化分析方法。
[Abstract]:In view of the present research situation of seismic behavior index quantification of offshore isolated bridges in China, the seismic design idea based on behavior is introduced, and the quantitative index limit value is established by Pushover analysis method. The reasonable division of behavior level of offshore isolated bridge is given. The displacement ductile ratio and bearing shear strain are selected as quantitative indexes, and the formula method and Pushover method are used to calculate the limit value of quantitative index. Three natural seismic waves are selected to analyze the incremental dynamic time history of offshore isolated bridges, and the displacement responses of structures under different PGA are obtained. According to the displacement of pier top and the deformation of support under different intensity ground motion, the limit value of performance index calculated in this paper is compared and analyzed. The results show that for low pier bridges, the limit value of quantitative index calculated by formula method is smaller than that by Pushover method, and the Pushover method can reasonably determine the performance index. It can provide a feasible quantitative analysis method for the behavior design and vulnerability analysis of offshore isolated low pier bridges.
【作者单位】： 广州大学;广州大学工程抗震研究中心;
【基金】：国家重点基础研究发展计划973项目(2011CB013606) 国家自然科学基金高铁联合基金重点项目(U1334209)
【分类号】：U442.55
[Abstract]:In view of the present research situation of seismic behavior index quantification of offshore isolated bridges in China, the seismic design idea based on behavior is introduced, and the quantitative index limit value is established by Pushover analysis method. The reasonable division of behavior level of offshore isolated bridge is given. The displacement ductile ratio and bearing shear strain are selected as quantitative indexes, and the formula method and Pushover method are used to calculate the limit value of quantitative index. Three natural seismic waves are selected to analyze the incremental dynamic time history of offshore isolated bridges, and the displacement responses of structures under different PGA are obtained. According to the displacement of pier top and the deformation of support under different intensity ground motion, the limit value of performance index calculated in this paper is compared and analyzed. The results show that for low pier bridges, the limit value of quantitative index calculated by formula method is smaller than that by Pushover method, and the Pushover method can reasonably determine the performance index. It can provide a feasible quantitative analysis method for the behavior design and vulnerability analysis of offshore isolated low pier bridges.
【作者单位】： 广州大学;广州大学工程抗震研究中心;
【基金】：国家重点基础研究发展计划973项目(2011CB013606) 国家自然科学基金高铁联合基金重点项目(U1334209)
【分类号】：U442.55
【参考文献】
相关期刊论文 前7条
1 孙颖;卓卫东;房贞政;;规则桥梁抗震性能水准的定义及其量化描述[J];地震工程与工程振动;2011年05期
2 梁智W，
本文编号：2493467
本文链接：https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/2493467.html
