摘要
为了对部分斜拉桥进行抗震阻尼器优化设计,以珠海市鸡啼门特大桥为例进行分析。建立ANSYS有限元模型,采用反应谱法分别分析了不同工况组合,50年内地震强度超越概率10%和2.5%地震作用下结构振动响应。研究发现:可以增加固定支座水平承载力或者允许固定支座在地震中剪断来提高该类桥梁的抗震性能;对桥梁进行阻尼器优化设计,通过对比分析,确定本桥所对应的最优阻尼器设置参数ξ=0.3,C=2×103kN(m/s)-ξ;对阻尼器优化结果进行验算,发现在该阻尼器参数下桥梁墩柱关键截面的内力显著减小,优化效果最高使得屈服弯矩减小69.3%。
To optimize the design of seismic dampers for partial cable-stayed bridge,the analysis was performed using the Jitimen Bridge in Zhuhai as an example. An ANSYS finite element model was established,and the response spectrum method was used to analyze the structural vibration in the earthquakes with the exceeding probabilities of 10% and 2.5% in 50 years under different working conditions. The study reveals that the seismic performance of this type of bridge can be improved by increasing the horizontal bearing capacity of the fixed support or allowing the fixed support to be sheared in an earthquake. In addition,the damper of the bridge was optimized. Based on the comparison analysis,the optimal damping parameters are determined as follows:ξ =0.3,C=2×103 kN(m/s)-ξ. With the verification of damper optimization results,it is found that the internal force of the key section of the bridge pier column is significantly reduced under the optimized damper parameters. The yield bending moment can be reduced by up to 69.3%.
作者
游嘉玮
顾箭峰
卢海林
YOU Jiawei;GU Jianfeng;LU Hailin(School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan 430074,China)
出处
《武汉工程大学学报》
CAS
2020年第4期444-450,共7页
Journal of Wuhan Institute of Technology
基金
湖北省教育厅科学技术研究计划指导性项目(B2018051)
武汉工程大学科学研究基金(K2017025)。
关键词
结构抗震
部分斜拉桥
反应谱法
振动响应
阻尼器设计
structure seismic
partially cable-stayed bridge
response spectrum method
vibration response
damper design
作者简介
游嘉玮,硕士研究生。E-mail:474938834@qq.com;通讯作者:卢海林,博士,教授。E-mail:hail_lu@yangtzeu.edu.cn。
