【摘要】 基于性能的结构抗震设计是各国结构抗震设计规范未来的主要发展方向,虽然其理论框架已基本形成,然而其中至关重要的结构抗震性能水准的定义及其量化描述问题,目前仍处于研究探讨阶段。本文从公路梁式桥震害现象出发,采用极限状态设计概念,对规则桥梁在地震作用下的性能水准予以明确的定义;并以墩顶漂移率作为设计参数,通过对大量试验数据的统计分析,给出了与各级不同性能水准(完好、轻微破坏、中等破坏、严重破坏及倒塌)相对应的目标值,供基于性能的抗震设计采用。更多还原

【Abstract】 Performance-based seismic design(PBSD) is known as the future development trend for structural seismic design codes of many countries.The framework of PBSD is formed at present,however,the most important thing of PBSD,namely,the definitions and quantified descriptions of seismic performance levels for various structures are still under discussion.From the damage phenomena of highway beam-bridges,a clear definition for the seismic performance levels of regular bridges under earthquake action is given based on the limit state concept for seismic design.The drift ratio of the bridge column is employed as design parameter,and its target values for each seismic performance level,including no damage,minimal damage,medium damage,significant damage,and collapse,are given respectively from the statistic analysis of a large number of experimental data.The results can be used in the performance-based seismic design of regular highway bridges.更多还原