基于IDA钢管混凝土桁架连续曲线桥抗震易损性分析

发布时间：2018-04-10 20:17

本文选题：易损性 + 增量动力分析　；参考：《防灾减灾工程学报》2017年01期

【摘要】：以一座最大墩高50m曲线钢管混凝土空间组合桁架连续梁桥为工程背景,采用OpenSees建立其弹塑性三维有限元动力分析模型,从PEER地震数据库中选取10条地震动记录对其进行增量动力分析。以典型墩最不利截面材料损伤应变所对应截面曲率为损伤指标,利用能力需求比对数函数进行回归分析,计算不同构件在不同损伤状态下的破坏概率,建立墩柱易损性曲线和支座易损性曲线。基于联合失效概率分析方法,形成了桥梁系统易损性曲线。同时建立多个对比模型,分析墩跨比和曲线半径对桥梁易损性影响。结果表明:钢管格构桥墩高度差异不大时,和钢筋混凝土桥墩相邻的首个钢管格构桥墩震动响应较大;本桥墩和梁之间大量使用橡胶支座从而形成弹性连接和铰接的减震措施,可有效降低桥梁完全破坏概率;墩跨比增大将导致桥梁系统完全破坏损伤概率随之增大;随着曲线半径增大,损伤概率逐渐增大,曲线桥本身拱结构对顺桥向地震有一定抵抗作用。
[Abstract]:Taking a 50m curved steel tube concrete filled steel tube spatial composite truss continuous beam bridge with the maximum pier height as the engineering background, the elastic-plastic three-dimensional finite element dynamic analysis model is established by using OpenSees.From the PEER seismic database, 10 seismic records are selected to analyze the incremental dynamics.Taking the curvature of the section corresponding to the material damage strain of the most unfavorable section of a typical pier as the damage index, the failure probability of different components under different damage states is calculated by using the logarithmic function of capacity requirement ratio.The vulnerability curves of piers and columns and the curves of pedestal vulnerability were established.Based on the joint failure probability analysis method, the vulnerability curve of bridge system is formed.At the same time, several comparative models are established to analyze the impact of pier span ratio and curve radius on bridge vulnerability.The results show that the vibration response of the first steel pipe lattice bridge pier adjacent to the reinforced concrete pier is larger when the height of the steel tube lattice bridge pier is not different, and the rubber bearing is widely used between the bridge pier and the beam to form elastic connection and hinge damping measures.It can effectively reduce the probability of complete damage of bridge, increase the ratio of piers to span will lead to the increase of the probability of complete damage of bridge system; with the increase of curve radius, the probability of damage increases gradually.The arch structure of the curved bridge itself can resist the earthquake along the bridge to a certain extent.
【作者单位】：天津城建大学土木工程学院;天津市土木建筑结构防护与加固重点实验室;
【基金】：国家自然科学基金项目(51278327)资助
【分类号】：U442.55

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