摘要
基于等效线性方法及等效塑性铰理论,根据铅芯橡胶支座(LRB)规则连续梁桥的动力特性以及强震作用下隔震支座和桥墩非线性特征将规则连续梁桥结构简化为单自由度体系,并对于体系的等效刚度及等效阻尼比进行了估计。选取主梁位移及桥墩墩顶位移作为目标位移,利用修正的长周期高阻尼位移反应谱进行了基于位移的桥梁抗震设计。最后给出了设计实例,设计结果与采用SAP2000计算的弹塑性时程分析结果比较满足工程精度要求,适用于具有不同性能水平下的规则型LRB隔震桥梁的初步分析和设计,可以为强震作用下LRB隔震桥梁地震反应分析提供参考。
Based on the equivalent linear method and the equivalent plastic hinge theory,regular continuous bridge structure is simplified as the single degree-of-freedom system according to the dynamic performance of the lead rubber bearing（LRB）isolated bridge and non-linear characteristic of LRB and pier when LRB isolated bridge experience strong motion,and the equivalent stiffness and damping ratio of the system are estimated.The displacement of gird and top of pier are choosed as target displacement,and displacement-based seismic design is presented by using the revised displacement response spectrum which has long period and high damping.Finally,design example is shown,and compared with the design result and the elastoplasticity time history analysis result using the SAP2000 computation,it satisfies project accuracy requirement,and is suitable for preliminary analysis and design of regular LRB isolated bridge under the different performance level,and can provide the reference for earthquake response analysis of regular LRB isolated bridge under strong motion.
出处
《公路工程》
2010年第4期89-93,共5页
Highway Engineering
关键词
LRB规则连续梁桥
简化设计
等效线性化法
修正位移反应谱
Lead rubber bearing regular continuous bridge
Simplify design method
Equivalent linear
The revised displacement response spectrum
