摘要
为研究设置横系梁对混凝土双柱墩横桥向地震反应的影响,基于Open SEES有限元软件,建立了无系梁以及考虑系梁的双柱墩有限元模型,应用非线性时程方法,研究了无系梁、假设系梁保持弹性以及容许系梁屈服对于双柱墩地震反应的影响,在此基础上,分析了系梁与立柱屈服强度比、刚度比以及地震动强度等因素的效应。结果表明,与要求系梁保持弹性相比较,容许系梁屈服对于墩顶地震位移需求影响不大,而可以有效减小系梁与立柱节点弯矩以及墩底截面曲率地震需求。容许系梁屈服,利用系梁耗能,不但可以有效减少系梁本身的地震弯矩需求,还可以有效改善系梁与立柱节点和墩底截面的地震反应。
To investigate the effects of link beam on the transverse seismic performance of concrete double-column bridge bent,finite element models of double-column bridge bent with or without link beam were established separately utilizing OpenSEES software.Nonlinear time history analysis method was applied to analyzed the influences of remaining the link beam in the elastic range or allowing it to yield under the earthquake excitation on the seismic response of the bridge bent.Further,the effects of the ratio of flexural strength and stiffness between the link beam and the column and seismic intensity were discussed through parametric study.Results indicate that allowing the link beam to yield during the earthquake has fewer effects on the displacement demand at the top of the bridge bent,but it can reduce the moment acting on the column and link beam joint and curvature demand at the column bottom section effectively compared to remaining the link beam in the elastic range.Allowing the link beam to yield and dissipate energy from the earthquake can not only decrease the moment demand at the end of the link beam itself,but also mitigate the earthquake response at the column and link beam joint and the column bottom section effectively.
作者
黄俊飞
邹德义
李建中
HUANG Junfei;ZOU Deyi;LI Jianzhong(School of Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai Municipal Engineering Design Institute,Shanghai 200092,China)
出处
《结构工程师》
北大核心
2018年第A01期1-8,共8页
Structural Engineers
关键词
双柱墩
横系梁
耗能
抗震性能
double-column bridge bent
link beam
energy dissipation
seismic performance
