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

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (23) : 87-94.

LI Lifeng1,2,LI Minghua1,HU Rui1

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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.

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

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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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