钢筋混凝土框架结构连续倒塌动力放大系数  

Dynamic Increase Factor During the Progressive Collapse of RC Frame Structures

作　　者：肖诗云[1] 董华行 刘金凤[1] 

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024

出　　处：《东北大学学报（自然科学版）》2014年第9期1350-1355,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51178082);国家自然科学基金创新研究群体资助项目(51121005)

摘　　要：研究了钢筋混凝土框架结构连续倒塌破坏设计中的动力放大系数的取值,系统性地研究了结构的最大塑性转角、高度、宽度、配筋率及跨度对动力放大系数的影响.结果表明:不同结构的动力放大系数变化趋势一样,最大值仅为1.13,远远小于美国GSA规范给定的2.0;动力放大系数随着最大塑性转角的增加而减小,随着截面配筋率的增加而增加;结构的角柱失效的动力效应大于内柱的失效;结构不同的高宽比、跨度、截面尺寸和荷载大小对动力放大系数影响不大.The specification of dynamic increase factor （DIF）during the progressive collapse design of RC frame structures was studied, and the influence of maximum plastic angle, height, width, reinforcement ratio and the lengths of bay were studied systematically. The results demonstrate that the DIF of different models has the same trend and the maximum is about 1.13, which is far less than that given by the GSA Standard. The DIF decreases with the increasing plastic angle but increases with the increasing reinforcement ratio. The dynamic effect of RC structures after removing the corner column is greater than that after removing the interior column. Other factors, such as the aspect ratio, the lengths of bay, the section sizes and the loading pattern, have no significant influence on the DIF.

关 键 词：钢筋混凝土框架结构 连续倒塌 动力效应 动力放大系数 拆除构件法 

分 类 号：TU375.4[建筑科学—结构工程]