多跨简支梁桥加固措施的抗震性能评估
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摘要
对一座典型的五跨简支铁路箱梁桥进行了多种工况的非线性地震反应分析,评价限位拉索、混凝土墩套、橡胶支座和铅芯橡胶支座等措施对桥梁主要构件抗震性能的影响.结果表明,各措施对桥梁构件的抗震性能有不同程度的改善,限位拉索和铅芯橡胶支座可以有效消减使用活动支座或普通橡胶支座时墩梁的相对位移;铅芯橡胶支座和普通橡胶支座均显著减少了桥墩的延性需求,但普通橡胶支座加大了墩梁间的相对位移和梁体对桥台的碰撞;限位拉索的初始间隙可考虑支座的允许变形,适当取较大值.建议采用铅芯橡胶支座或普通橡胶支座更换固定支座,必要时采用增加混凝土墩套的方法提高桥墩的塑性变形能力.研究成果可用于结构的易损性评价和基于桥梁整体性能的系统化抗震研究.
This paper conducts a nonlinear time-history analysis of a typical 5-span simply supported bridge by using three-dimensional models to evaluate the effectiveness of various retrofit measures. Restrainer cables,concrete jackets,elastomeric bearings,and lead rubber bearings are assessed for their influence on the variability of critical components in the bridge. The results indicate that each retrofit measure may be effective for components of the bridge in different degrees. The restrainer cables and lead-rubber bearings( LRBs) are effective in controlling the relative deformation between girders and piers; LRBs and elastomeric bearings improve the response of the vulnerable columns,elastomeric bearings lead to increased abutment demands,and a larger value can be chosen for the initial gap of the restrainer cable based on the permitted deformations of the bearings. Additionally,it is recommended to replace these fixed bearings with elastomeric bearings or LRBs,and to enhance ductility capacity of the columns with concrete jackets when necessary. The results can be used for vulnerability assessments that consider the impact of retrofit on system vulnerability reflecting the contribution of multiple components.
引文
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