학술논문
基于增量动力分析法的多柱失效钢框架连续倒塌研究 / Study of progressive collapse of steel frames with multi-column failed based on incremental dynamic analysis method
Document Type
Academic Journal
Author
黑晓丹; 孙海峰; 王斌; 张勤生; 朱权秀; 王多军; HEI Xiaodan; SUN Haifeng; WANG Bin; ZHANG Qinsheng; ZHU Quanxiu; WANG Duojun
Source
建筑结构 / Building Structure. 53(23):85-93
Subject
Language
Chinese
ISSN
1002-848X
Abstract
针对连续倒塌研究中单构件失效与实际偶然荷载造成多构件失效不符这一问题,建立 11 个数值模型.考虑楼板影响,采用增量动力分析法(IDA),研究多柱失效后剩余结构抗连续倒塌能力、失效机理和抗力计算,并与单柱失效进行对比.结果表明,多柱失效时,模型1 在β≤1、模型2～6 在β≤2 时处于小变形阶段,由梁机制和空腹作用抵抗连续倒塌;大变形阶段时由悬链线机制和空腹作用抵抗连续倒塌.模型 7～9 在β≤2 时处于小变形阶段,β继续增大无法形成有效悬链线机制,结构抗力由梁机制和空腹作用提供.单柱失效时,模型 10 和模型 11 在β≤3时处于小变形阶段,发生连续倒塌时最大β分别为 4.8 和 5.4,单柱失效时结构抗倒塌能力大于多柱失效.随β值增大,多柱失效结构位移响应更敏感.CRS(column removal span)梁两侧框架侧向刚度不同会导致结构发生非对称破坏.同时分析模型 1～6 和模型 7～9 的CRS梁破坏机理,并总结多柱失效时梁机制、悬链线机制以及空腹作用的计算公式.
Aiming at the problem that the failure of a single component does not match the failure of multiple components caused by the actual explosion in the progressive collapse study,11 numerical models were established.Considering the influence of the floor,the incremental dynamic analysis method(IDA)was used to study the progressive collapse resistance,failure mechanism,and resistance calculations of the remaining structure after the failure of multiple columns,and compared with single column failure.The results show that when multi-column fail,model 1 is in the small deformation stage when β≤1,and models 2 to 6 are in the small deformation stage when β≤2,and the progressive collapse is resisted by the beam mechanism and the emptying action.In the large deformation stage,the catenary mechanism and emptying action resists progressive collapse.Models 7 to 9 are in the small deformation stage when β≤2,and the catenary mechanism cannot be formed when β continues to increase,and the structural resistance is provided by the beam mechanism and the emptying action.When a single column fails,model 10 and model 11 are in a small deformation stage when β≤3,and the maximum β is 4.8 and 5.4 respectively when progressive collapse occurs,and the collapse resistance capacity of structure when single column fails is greater than that of multi-column fail.As the value of β increases,the displacement response of the multi-column failure structure is more sensitive.The different lateral stiffness of the frame on both sides of CRS(column removal span)beam will lead to asymmetric failure of the structure.At the same time,the failure mechanisms of CRS beam from model 1 to model 6 and model 7 to model 9 were analyzed respectively,and the calculation formulas of beam mechanism,catenary mechanism and emptying effect when multiple columns fail were summarized.
Aiming at the problem that the failure of a single component does not match the failure of multiple components caused by the actual explosion in the progressive collapse study,11 numerical models were established.Considering the influence of the floor,the incremental dynamic analysis method(IDA)was used to study the progressive collapse resistance,failure mechanism,and resistance calculations of the remaining structure after the failure of multiple columns,and compared with single column failure.The results show that when multi-column fail,model 1 is in the small deformation stage when β≤1,and models 2 to 6 are in the small deformation stage when β≤2,and the progressive collapse is resisted by the beam mechanism and the emptying action.In the large deformation stage,the catenary mechanism and emptying action resists progressive collapse.Models 7 to 9 are in the small deformation stage when β≤2,and the catenary mechanism cannot be formed when β continues to increase,and the structural resistance is provided by the beam mechanism and the emptying action.When a single column fails,model 10 and model 11 are in a small deformation stage when β≤3,and the maximum β is 4.8 and 5.4 respectively when progressive collapse occurs,and the collapse resistance capacity of structure when single column fails is greater than that of multi-column fail.As the value of β increases,the displacement response of the multi-column failure structure is more sensitive.The different lateral stiffness of the frame on both sides of CRS(column removal span)beam will lead to asymmetric failure of the structure.At the same time,the failure mechanisms of CRS beam from model 1 to model 6 and model 7 to model 9 were analyzed respectively,and the calculation formulas of beam mechanism,catenary mechanism and emptying effect when multiple columns fail were summarized.