Nghiên cứu sự sụp đổ lũy tiến của khung bê tông cốt thép toàn khối chịu tải trọng nổ gần và đề xuất một số giải pháp kháng sập

Abstract

Structures used in civil - industrial and defence fields are mostly applied by steel or reinforced concrete. Under the effect of various loading, especially dynamic loading from the explosion, the deformation of elemental sections of elastoplastic frames can reach the plasticity state, and flexible joints in the structure will be appeared. The progressive appearance of these flexible joints let the structural system's stiffness reduce and limited deformation may be appeared. The progressive collapse of the structure will occur whenever the local bearing of the structure is failed. However, studying the effects of explosive loading on structures is a very complicated problem with large errors. In Vietnam, the issues currently have been solved by using some experimental loading formulas and still lacking the progressive collapse process method. The paper is focused on using numerical simulation to analyze the progressive collapse of a monolithic reinforced concrete frame under the influence of contact blast loading. The simulation results are compared with the experimental data. The matching between them is still reached. Hence, the proposes of progressive resistance solutions for special structures also offered.