基于自振与频谱特性影响的LRB连续梁桥隔震效果研究  

Research on Isolated Effect of Continuous Girder Bridges with LRB Based on Influenced by Self-vibration Characteristic and Spectrum Characteristic

作　　者：马涌泉[1] 陈水生[1] 

机构地区：[1]华东交通大学土木建筑学院,南昌330013

出　　处：《武汉理工大学学报》2011年第7期101-106,128,共7页Journal of Wuhan University of Technology

基　　金：国家自然科学基金重点资助项目(50868007);江西省自然科学基金重点资助项目(550012)

摘　　要：为了探讨桥梁自振特性与地震波频谱特性对LRB隔震效果的影响,以典型三跨连续梁桥为工程背景,采用Bouc-Wen恢复力模型模拟LRB非线性滞回特性,采用Takeda三线性模型模拟桥墩非线性特性,编制了运用Newmark时间积分法和四阶显式Runge-Kutta迭代法联合求解增量形式的全桥非线性运动方程的时程分析程序。利用程序并结合算例对LRB隔震连续梁桥在不同地震激励和不同基本周期影响下的隔震效果进行了分析。结果表明,桥梁结构基本周期和地震激励频谱成分对LRB的隔震效果有较大影响;在易发生低频脉冲型地震波的场地上不宜使用LRB作为桥梁的隔震设备。In order to investigate the isolated effect of LRB influenced by self-vibration characteristic of the bridge and spectrum characteristic of seismic,taking an typical three-spans continous beam bridge for example,the Bouc-Wen restoring force model is adopted to simulate the nonlinear hysteric characteristic for LRB,the Takeda three linear model is adopted to simulate the nonlinear for pier,and the time-history analyses procedure of the Newmark and the Runge-Kutta iterative strategy used to solve the increment form nonlinear governing equation of motion is programmed.Using the procedure and combining calculation example analyses isolated effect of isolated bridges with LRB influenced by structure self-vibration characteristic and seismic excitation spectrum characteristic.The consequences indicate that structure self-period and spectrum component of seismic excitation have a significant influence on the isolated effect of LRB;the LRB is not suitable for isolated.The impulse pulse with easiest to happened seismic of low-frequency should not take LRB as isolated equipment of bridges.

关 键 词：隔震连续梁桥 铅芯橡胶支座 自振特性 地震激励 频谱特性 隔震效果 

分 类 号：U442.51[建筑科学—桥梁与隧道工程]