摘要
从地震位移控制的原理出发,根据大跨悬索桥结构地震响应的特点,建立了其地震位移控制效果的3种评估函数,提出了一种基于罚函数和一阶优化原理的阻尼器最优布置方法.以主跨1 490m的润扬悬索桥为研究对象,基于ANSYS建立了该桥的空间有限元计算模型,采用Combin14单元对阻尼器进行模拟,用以研究大跨悬索桥地震位移控制的阻尼器空间最优布置,并给出了该桥在给定地震输入下阻尼器的最优布置.研究结果表明,对于大跨悬索桥而言,只要阻尼器数目及参数选取合理,按合理方式设置均能有效地控制结构的地震位移响应及减小大多数关键截面的地震力,但采用不同控制效果评估函数得到的阻尼器最优布置方案略有差别.
After introducing the mechanism of seismic displacement control with dampers, 3 kinds of assessment functions for seismic response control effect are formulated based on the seismic response characteristics of long-span suspension bridges and a new optimal placement method of dampers using penalty function and first order optimization theory is proposed. Runyang suspension bridge （RSB）, with a main span of 1 490 m, is the longest bridge in China. As an example, a spatial finite element （FE） model for RSB is established with program ANSYS, and the Combinl4 element is adopted to simulate the damper. On the basis of which seismic response analyses using different placement of dampers are carried out with the optimal placement method, and the optimal placements of dampers with the three assessment functions are then achieved, respectively. The three optimal control effects are analyzed and compared. Results show that different assessment functions can lead to different optimal placements when the number of dampers is determined, but any placement of dampers can reduce the seismic displacement significantly on condition that the parameters and the number of dampers are proper.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第2期315-319,共5页
Journal of Southeast University：Natural Science Edition
基金
国家高技术研究发展计划(863计划)资助项目(2006AA04Z416)
国家自然科学基金重点资助项目(50538020)
关键词
大跨悬索桥
地震位移控制
阻尼器
最优布置
一阶优化
评估函数
suspension bridge
seismic control
damper
optimal placement
first order optimization
assessment function
作者简介
李爱群（1962-），男，博士，教授，博士生导师，aiqunli@seu．edu．cn
