基于易损性的大跨度斜拉桥黏滞阻尼器参数优化

李立峰1,2,李名华1,胡睿1

振动与冲击 ›› 2023, Vol. 42 ›› Issue (23) : 87-94.

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (23) : 87-94.
论文

基于易损性的大跨度斜拉桥黏滞阻尼器参数优化

  • 李立峰1,2,李名华1,胡睿1
作者信息 +

Parametric optimization of viscous damper for large-span cable-stayed bridge based on vulnerability

  • LI Lifeng1,2,LI Minghua1,HU Rui1
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文章历史 +

摘要

大跨度斜拉桥黏滞阻尼器的参数设计通常基于特定地震波的单一构件性能优化,未考虑地震动随机性的影响,以及构件间的相对损伤情况。针对上述问题,提出基于易损性和响应面的参数优化方法:以一座大跨斜拉桥为例,采用OpenSees建立非线性动力模型,基于易损性分析理论评估不同黏滞阻尼器参数下的斜拉桥抗震性能,利用响应面拟合阻尼器参数与易损性的非线性函数关系,以系统易损性最小、损伤路径合理为目标进行参数优化。结果表明:速度指数一定时,随着阻尼系数的增大,各支座的抗震性能单调递增,桥塔和斜拉索的抗震性能先增后减,过渡墩和辅助墩的抗震性能变化很小,基本不受阻尼器参数的影响;斜拉桥黏滞阻尼器的最优参数是桥塔与支座抗震性能综合最优的结果;未优化构件损伤路径所得参数的系统抗震性能更优,但损伤路径并不合理,会高估斜拉桥的实际抗震表现。

Abstract

The parameter design of viscous dampers for large-span cable-stayed bridges is usually based on the optimization of the performance of a single member for a specific seismic wave, without considering the effect of the randomness of ground motions and the relative damage among the members. To solve the above problems, a parameter optimization method based on fragility and response surface was proposed: taking a long-span cable-stayed bridge as example, a nonlinear dynamic finite element model was established by OpenSees, fragility analysis theory was applied to evaluate the seismic perforce of cable-stayed bridge with different viscous damper parameters. In order to minimize the system fragility and rationalizing the damage path, response surface method was used to fit the nonlinear function between the viscous dampers parameters and system fragility. The results show that: at a certain velocity index, as the damping coefficient increases, the seismic performance of each bearing increases monotonically, the seismic performance of towers and cable-stayed bridges tends to increase first and then decrease, the seismic performance of transition piers and auxiliary piers is basically the same, they are not affected by the damper parameters basically; the optimal parameters of the dampers for cable-stayed bridges are the result of the integrated optimal seismic performance of the bridge towers and bearings; the seismic performance of the system with the parameters obtained from the damage path of unoptimized members is better, but the damage path is not reasonable, which will overestimate the actual seismic performance of cable-stayed bridges.

关键词

桥梁工程 / 大跨度斜拉桥 / 黏滞阻尼器 / 易损性分析 / 响应面法

Key words

bridge engineering / long-span cable-stayed bridge / viscous damper / fragile analysis / response surface method

引用本文

导出引用
李立峰1,2,李名华1,胡睿1. 基于易损性的大跨度斜拉桥黏滞阻尼器参数优化[J]. 振动与冲击, 2023, 42(23): 87-94
LI Lifeng1,2,LI Minghua1,HU Rui1. Parametric optimization of viscous damper for large-span cable-stayed bridge based on vulnerability[J]. Journal of Vibration and Shock, 2023, 42(23): 87-94

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