基于一阶振型参与系数等效的减隔震桥梁地震反应简化分析方法  

A Simplified Method for Isolation Bridges with Equivalent First Mode Participation Factor

作　　者：彭天波[1,2] 梁力 PENG Tianbo;LIANG Li(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;Guangdong Bay Area Transportation Construction Investment Co.,Ltd.,Guangzhou 511462,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]同济大学土木工程学院,上海200092 [3]广东湾区交通建设投资有限公司,广州511462

出　　处：《结构工程师》2023年第2期56-63,共8页Structural Engineers

摘　　要：为了提高减隔震桥梁简化体系的精度,提出了基于一阶振型参与系数等效的简化方法,采用双自由度体系来模拟桥墩,保证简化前后桥墩结构的一阶振型质量、一阶振型刚度和一阶振型参与系数一致。为了说明该方法的合理性,分析了不同简化方法得到的减隔震桥梁前两阶动力特性,并采用非线性时程分析方法,对比了不同墩高下该方法与其他简化方法的响应误差。结果表明:相比其他简化方法,本文提出的简化方法前两阶动力特性与原结构更接近,且地震响应误差更小。In order to improve the precision of the simplified system of seismic isolation bridge,a simplified method with equivalent first mode participation factor is proposed in this paper.The two-degree-of-freedom system is used to simulate the bridge pier.In order to demonstrate the rationality of the proposed method,the first two mode dynamic characteristics of seismic isolation bridges obtained by different simplified methods are analyzed,and the response errors are compared for different pier heights by nonlinear time history analysis method.The results show that the first two mode dynamic characteristics of the proposed simplified method are closer to the original structure,and the seismic response error is smaller.

关 键 词：减隔震桥梁 桥墩 简化方法 振型参与系数 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]