Anti-progressive collapse dynamic effect of RC beam-slab substructure under blast load
LI Zhi1,2, YUAN Xiaolan2, DONG Tengfang2, HUANG Xi3,DENG Xiaofang1,2
1.Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin University of Technology, Guilin 541004, China;
2.College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, China;
3.School of Management Engineering, Guangxi Construction Vocational and Technical College, Nanning 530028, China
Abstract：In order to study the progressive collapse resistance of building structure under blast load. In this paper, ANSYS/LS-DYNA finite element software is used to study the dynamic response of reinforced concrete (RC) beam-slab substructure resistance progressive collapse under blast load, and the concrete strength, reinforcement ratio and span ratio are extended and analyzed. The results show that transient column removal can lead to conservative or high degree structural residual capacity and damage. The concrete strength has a significant effect on the dynamic response of structure. When the concrete strength is greater than C40, the compressive menbrane action and arch mechanism of the structure are enough to resist collapse. The increase of reinforcement ratio has little effect on the resistance of arch action, but can significantly improve the resistance of catenary action. The span height ratio has a significant influence on the development of structural resistance mechanism. The reduction of span height ratio can improve the resistance of arch action and compressive menbrane action, but has little influence on the catenary action resistance.
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