摘要
根据多跨连续梁桥的主要结构特点,提出了地震行波效应分析的多跨连续梁桥分析模型.采用绝对位移法建立多点输入的运动平衡方程,并应用非线性时程方法对行波输入下地震反应的支承长度进行了参数分析.结果表明:系统的基本周期大小、滑动支座摩阻系数、过渡墩的基本周期以及行波输入延时对地震反应的支承长度有重要影响;同时考虑行波效应的多点输入与地震动一致输入的计算结果有较大的差别,行波效应会使墩梁相对位移明显增大,相应地也增大了地震作用下支承长度的需求.
Based on the key dynamic characteristics of multi-span continuous bridges, a simplified analytical model was adopted to study the effects of traveling waves. Using the absolute displacement method, the equilib- rium equation of motion was established. Then, effects, such as those of the value of natural periods, coefficient of friction, the period of the transitional pier and time lag were discussed with the nonlinear time-history analysis method under the longitudinal excitation of traveling waves. The results have shown that the relative displacements between adjacent bridge piers and girders increase significantly, considering the effects of traveling waves, and accordingly, the required seating length increases.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第10期6-10,共5页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(50578118)
关键词
多跨连续梁桥
非线性时程方法
行波效应
支承长度
multi-span continuous bridges
nonlinear time-history analysis
traveling seismic wave
the required seating length
作者简介
周光伟（1972-），男，湖南泪罗人，同济大学博士研究生 通讯联系人，E-mail：zhougw13@163．com
