结构模态Pushover及高振型影响的对比评估  

A Comparative Evaluation of Model Pushover and the Influence of Higher Modes

作　　者：王七林[1] 闻奇光[2] 

机构地区：[1]重庆大学建筑设计研究院,重庆400045 [2]中国汉嘉设计集团股份有限公司西南分公司,成都610041

出　　处：《土木建筑与环境工程》2009年第1期60-65,71,共7页Journal of Civil,Architectural & Environment Engineering

基　　金：重庆市科委自然科学基金计划资助项目(CSTC-2006BB7022)

摘　　要：以6层、10层和16层规则钢筋混凝土平面框架为例,对框架输入3种不同加速度幅值的地震动,并将各框架在七条地震波作用下的非线性动力反应统计结果作为对比基准点,以层间侧移和梁、柱端部转角为考察对象,研究了4种常规Pushover及Modal Pushover的分析结果的误差变化规律。研究表明,随框架层数增加,Modal Pushover的层间侧移误差基本不变,常规Pushover的模拟误差明显增大,表明Modal Pushover能更合理地模拟高振型的影响。随非线性程度加深,Modal Pushover、常规Pushover分析的层间侧移误差均相应增大。Modal Pushover对上部楼层梁端转角和多数柱端转角的模拟误差明显比常规Pushover更小。Three reinforced concrete were taken as examples. Nonlinear plane frames with dynamic responses waves with varying earthquake intensities were select total heights of 6, 10, and 16 stories, respectively of three frames under excitations of seven earthquake ed as the datum mark of a comparison study. The changing rules of the responses analyzed by four kinds of ordinary Pushover Analysis and Modal Pushover Analysis were studied by reviewing the inter-story drift ratio and rotation at beam and column ends. Results show that the error of inter-story drift ratio analyzed by Modal Pushover Analysis essentially is invariable when the total frame height increases, while the error of ordinary Pushover Analysis is added corresponding to a larger fundamental period. This indicates that Modal Pushover Analysis can cover the influence of higher modes more reasonably. When nonlinear responses of frames were more severe, the inter-story drift ratio errors of Modal Pushover Analysis and ordinary Pushover Analysis also increase correspondingly. The errors of rotation at upper story beam ends and the majority of column ends analyzed by Modal Pushover Analysis are smaller than those of ordinary Pushover Analysis.

关 键 词：钢筋混凝土 框架 高振型 模态PUSHOVER 非线性分析 

分 类 号：TU311.3[建筑科学—结构工程]