Parameter optimization analysis of viscous dampers for isolated continuous curved girder bridges

被引：0
|
作者：
Wang H. [1 ]
Shen H. [1 ]
Zhang H. [1 ]
Zheng W. [1 ]
Sha B. [1 ]
Li A. [1 ]
机构：
[1] Key Laboratory of Concrete and Prestressed Concrete of Ministry of Education, Southeast University, Nanjing
来源：
Wang, Hao (wanghao1980@seu.edu.cn) | 1600年 / Editorial Board of Journal of Harbin Engineering卷 / 41期
关键词：
Continuous curved girder bridge; Isolation bearings; Parameter optimization; Seismic isolation; Seismic response; Sensitivity analysis; Viscous damper; Zero-order optimization algorithm;
D O I：
10.11990/jheu.201906080
中图分类号：
学科分类号：
摘要：
To improve the seismic performence of viscous dampers in isolated continuous curved girder bridges, the mechanical parameters of viscous dampers are optimized and analyzed. The finite element model of a three-span isolated continuous curved girder bridge is perfermed the basis on ANSYS. The influence of the velocity exponent and damping coefficient of viscous dampers are analyzed using the nonlinear dynamic time history method. The reasonable range of the parameters of viscous dampers are determined using the zero-order optimization algorithm, the parameters of viscous dampers are further optimized, with the sum of the absolute values of the shear force at the bottom of piers as the objective function. Results show that the damping coefficient has a significant effect on the displacement of bearings and the base shearforce of piers. The effect of the velocity exponent on the displacement of bearings and the base shearforce of piers is related to the damping coefficient. After the parameters of viscous dampers are optimized, the reduction ratio for tangential and radial displacement of the bearings reach 47% and 22.2%, respectively. The reduction ratio for tangential displacement of the bearings at the middle piers are higher than those at the side piers. Meanwhile, the damping ratios for radial displacement of the bearings at the side and middle piers are higher than those at the middle piers. The difference of the tangential shear between the side and middle piers is reduced from 956 kN to 220 kN and the difference of the radial shear between the side and middle piers is reduced from 441 kN to 130 kN, which ensure a balanced distribution of force on each pier. © 2020, Editorial Department of Journal of HEU. All right reserved.
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页码：282 / 288
页数：6
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