采用拉索模数伸缩缝的斜交桥减隔震参数优化

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摘要为了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。

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	张鹏辉
	冯睿为
	郭军军
	袁万城

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

Abstract：The computational cost of the existing optimization methods for the parameters of seismic isolation devicesin practical engineering project would dramatically become higher if the number of parameters increases. Meanwhile, some of the previous relevant studies only select one response parameter of structural components as the optimization target, which usually leads to limited optimized outcomes. Along these lines, the repair costs of the bridge under the E2 level earthquake are taken as the optimization goal, and the response surface method which can improve the search efficiency of the optimization is used to optimize the design parameters of the seismic isolation devices. Firstly, the component-based seismic loss assessment method and the response surface method combined with the central composite design were introduced. Secondly, a continuous skew girder bridge equipped with rubber bearings and cable-sliding modular expansion joints was taken as a case-study, and its numerical model was built using OpenSees platform. Then the ground motions matching the standard response spectra were selected as input, and the bearing stiffness, the slack length of the cable as well as the cable stiffness were optimized according to the proposed parameter optimization method. Finally, skew bridge models with cable-sliding modular expansion joints and ordinary modular expansion joints with different skew angles were established, and the damping effects of the cable-sliding modular expansion jointwere comparatively assessed. Results show that the proposed optimization method has high calculation efficiency and accuracy. The seismic repair cost of skew bridges is most affected by the stiffness of bearings, followed by the slack length of the cable, and the cable stiffness. The installation of the cable-sliding modular expansion joints could balance the damage of bearings and abutments, as a result, the bridge repair costs are significantly reduced. Repair costs of skew bridges with ordinary modular expansion joints increase with the increase of the skew angle while the losses of the oneswith cable-sliding modular expansion joints are less affected by the skew angle.

Key words： bridge engineering parameter optimization response surface method skew bridges seismic loss seismic mitigation and isolation

收稿日期: 2021-01-20 出版日期: 2022-05-15

引用本文:

张鹏辉，冯睿为，郭军军，袁万城. 采用拉索模数伸缩缝的斜交桥减隔震参数优化[J]. 振动与冲击, 2022, 41(9): 120-127.
ZHANG Penghui, FENG Ruiwei, GUO Junjun, YUAN Wancheng. Optimization of seismic mitigation and isolation parameters of skew bridge with cable modulus expansion joint. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(9): 120-127.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I9/120

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