多层RC框架结构倒塌阶段的简化模型分析  

SIMPLIFIED MODEL ANALYSIS FOR MULTI-STORY RC FRAME STRUCTURE IN COLLAPSE STAGE

作　　者：张亮泉[1] 刘昊东 刘梦鸽 张昊宇[2,3] ZHANG Liangquan;LIU Haodong;LIU Mengge;ZHANG Haoyu(School of Civil Engineering,Northeast Forestry University,Harbin 150040,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)

机构地区：[1]东北林业大学土木工程学院,哈尔滨150040 [2]中国地震局工程力学研究所地震工程与工程振动重点实验室,哈尔滨150080 [3]地震灾害防治应急管理部重点实验室,哈尔滨150080

出　　处：《低温建筑技术》2023年第2期60-65,76,共7页Low Temperature Architecture Technology

基　　金：国家自然科学基金青年基金项目(51108433);中国地震局工程力学研究所基本科研业务费(2019B12)。

摘　　要：针对多层RC框架常因底层薄弱而倒塌,提出了两种适用于结构倒塌阶段模拟分析和振动台试验的结构简化模型.采用基于位移的等效单自由度体系计算方法,验证了刚体模型的适用性.应用OpenSees有限元分析,分析了21个RC框架在8个影响因素下简化模型与原结构震害侧移的差别.结果表明在结构严重破坏至倒塌阶段,两种简化模型的侧移与原结构差别较小.对比两种简化模型,刚体模型的底层侧移更接近原结构,可用于结构的快速倒塌分析;单层简化模型可为振动台倒塌模拟试验在成本控制上提供参考.Structures of multi-storey RC frames are often subjected to collapse due to weak bottom floors.Two sim-plified structural models are proposed for structural collapse stage simulation analysis and shaking table test.The displacement-based equivalent single degree-of-freedom system calculation method is used to verify the applicabil-ity of the rigid body model.OpenSees software is used to analyze the difference of side displacement between the simplified models and the original 21 RC frame structures under 8 influencing factors.The results show that there is lttle difference between the side displacement of the two simplified models and the original structure from the stage of serious structural damage to collapse.Comparing the two simplified models,the bottom lateral displacement of the rigid body model is closer to the original structure and can be used for rapid collapse analysis of the structure.Sim-plified single-layer model may provide the reference for cost control of shaking table collapse simulation test.

关 键 词：简化模型 钢筋混凝土框架结构 倒塌分析 底部薄弱层 

分 类 号：TU375.4[建筑科学—结构工程]