采用拉索模数伸缩缝的斜交桥减隔震参数优化  

Optimization of seismic mitigation and isolation parameters of skew bridge with cable modulus expansion joint

作　　者：张鹏辉 冯睿为 郭军军[1] 袁万城[1] ZHANG Penghui;FENG Ruiwei;GUO Junjun;YUAN Wancheng(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《振动与冲击》2022年第9期120-127,166,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51978512,51778471);土木工程防灾国家重点实验室基金(SLDRCE19-B-19);山东省交通运输科技计划(2017B75)。

摘　　要：为解决减隔震参数优化过程中参数个数增加后计算量剧增和单一构件响应量作为优化目标优化效果不理想的问题,借助响应面方法提高最优解搜索效率,提出了以桥梁结构在E2水平设防地震下的震后维修费用为优化目标的减隔震参数优化方法。首先对基于构件的桥梁结构震后直接经济损失计算方法和结合中心复合设计的响应面方法进行了介绍;然后以一座设置拉索模数伸缩缝和板式橡胶支座的斜交连续梁桥为例,构建基于OpenSees数值平台的非线性有限元模型,选取与规范反应谱相匹配的原场地震动时程作为输入,对板式橡胶支座的刚度、拉索模数伸缩缝的自由程和拉索刚度进行了优化设计,验证所提方法的正确性和可靠性;最后建立了不同斜交角下分别采用拉索模数伸缩缝和普通模数伸缩缝的斜交桥模型,对比分析了拉索模数伸缩缝的减震效果。结果表明:所提的斜交桥减隔震参数优化方法具有较好的计算效率和准确性;斜交桥震后维修花费受支座刚度的影响最大,拉索自由程次之,受拉索刚度的影响最小;拉索模数伸缩缝的设置可以平衡支座损伤和桥台损伤,使桥梁的震后维修费用显著减少;设置普通模数伸缩缝的斜交桥,其震后维修费用随斜交角的增大而增加,而设置拉索模数伸缩缝的斜交桥,其震后维修费用受斜交角影响较小。Here,to solve problems of sharp increase in the amount of calculation after the number of parameters increasing and unideal optimization effect of single component response as the optimization objective in the process of seismic mitigation and isolation parametric optimization,a seismic mitigation and isolation parametric optimization method was proposed to improve the search efficiency of the optimal solution by means of the response surface method taking the post-earthquake maintenance cost of bridge structure under E2 horizontal fortification earthquake as the optimization objective.Firstly,the calculation method of direct economic loss of bridge structure after earthquake based on components and the response surface method combined with the central composite design were introduced.Then,taking a skew continuous beam bridge with cable modulus expansion joint and plate rubber bearing as an example,a nonlinear finite element model based on OPENSEES numerical platform was constructed,and the original site seismic time histories matching the code’s response spectrum were selected as the input to optimize stiffness of plate rubber bearing,free path of cable modulus expansion joint and cable stiffness,and verify the correctness and reliability of the proposed method.Finally,skew bridge models adopting cable modulus expansion joint and ordinary modulus expansion joint,respectively under different skew angles were established,and seismic mitigation effects of cable modulus expansion joint under different skew angles were analyzed contrastively.The results showed that the proposed optimization method of seismic mitigation and isolation parameters of skew bridge has better calculation efficiency and accuracy;the post-earthquake maintenance cost of skew bridge is most affected by bearing stiffness,effects of cable free path are the second,and effects of cable stiffness are the minimum;setting cable modulus expansion joint can balance bearing damage and abutment damage,and significantly reduce the bridge’s post-earthqu

关 键 词：桥梁工程 参数优化 响应面法 斜交桥 地震损失 减隔震 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]