极罕遇地震下单跨框架结构倒塌破坏机理研究  

Study on Collapse Mechanism of Single-span Frame Structure under Extremely Rare Earthquake

作　　者：宋维举 刘超 轩方方 SONG Weiju;LIU Chao;XUAN Fangfang(College of Civil Engineering,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038

出　　处：《粉煤灰综合利用》2024年第4期106-110,共5页Fly Ash Comprehensive Utilization

摘　　要：随着第五代GB 18306-2015《中国地震动参数区划图》中极罕遇地震概念的提出,有必要探讨在极罕遇地震作用下单跨框架结构的倒塌破坏机理。利用显式动力分析软件ANSYS/LS-DYNA对单跨框架结构在极罕遇地震作用下的倒塌过程进行模拟,通过合理选取参数和模型,再现单跨框架结构倒塌破坏的全过程,揭示极罕遇地震作用下单跨框架结构的倒塌破坏机理,为既有单跨框架结构的鉴定与加固提供理论依据。结果显示:在极罕遇地震作用下与多跨结构相比单跨框架结构抗震防线单薄,结构冗余度不足,且结构底层柱端出现塑性铰是引起单跨结构倒塌的主要原因。ith the concept of extremely rare earthquake proposed in the fifth generation of Seismic Ground Motion Parameter Zonation Map of China(GB 18306—2015),it is necessary to explore the collapse mechanism of single-span frame structures under extremely rare earthquake.Using the explicit dynamic analysis software ANSYS/LS-DYNA,the collapse process of the single span frame structure under the action of rare earthquakes is simulated.Through reasonable selection of parameters and models,the whole process of collapse and failure of the single span frame structure is reproduced.The collapse and failure mechanism of single-span frame structures under extremely rare earthquake is revealed,which provides a theoretical basis for the identification and strengthening of existing single-span frame structures.The results show that the main reason for the collapse of the single-span frame structure is that the anti-seismic defense line of the single-span frame structure is thinner than that of the multi-span structure,the structure redundancy is insufficient,and the plastic hinge at the bottom column end of the structure is the plastic hinge.

关 键 词：单跨框架结构 极罕遇地震 倒塌过程 仿真分析 

分 类 号：TU312.3[建筑科学—结构工程]