摘要
基于柔度法理论,运用OpenSees软件对钢框架结构的连续倒塌进行了全过程模拟分析,并采用柔度法单元对梁柱构件进行四段式划分,以实现对构件断裂的模拟.采用抽柱法,给出了结构连续倒塌的动力计算流程.以2个6层平面钢框架为数值算例,分析了结构失效点位移时程、构件塑性铰与断裂顺序,发现失效柱两侧的梁端部首先出现塑性铰,梁端断裂是框架发生整体倒塌的主要原因.最后通过与ABAQUS壳元分析结果及钢框架倒塌试验结果对比,验证了该方法的可行性与正确性,可在实际工程中应用.
Based on the flexibility method, whole process simulation for the progressive collapse of steel frame structures was conducted using OpenSees. Flexibility-based element was adopted to di- vide beam and column into four parts to achieve the fracture simulation of member. Based on the re- moving column method, the analysis procedure of structural progressive collapse was proposed. Two 6-storey steel frame examples were given to analyze the time history of failed nodal displacement and the sequence of members＇ plastic hinges and fractures. It is indicated that plastic hinges first appear in the ends of beams near the failed column. Member fracture in the beam ends is the main cause of collapse of the whole frame. The proposed method is verified by the results from ABAQUS software package and experiments. It can be applied to practical engineering in future.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第4期763-768,共6页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51178098
51208263)
东南大学优秀青年教师教学科研资助计划资助项目(2242014R30005)
关键词
柔度法
OPENSEES
连续倒塌
钢框架结构
抽柱法
flexibility method
OpenSees
progressive collapse
steel frame structure
removingcolumn method
