Destruction analysis of RC frame structure with infill walls under internal explosion

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (5) : 289-301.

SHOCK AND EXPLOSION

Destruction analysis of RC frame structure with infill walls under internal explosion

CHEN Gongqing1, WU Hao1, OU Yuan*2, WANG Fan2, L Jinxian1

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Abstract

Damage analysis of ground building under blast loading has significant practical guidance for developing combat strike strategies and engineering protection design. The LS-DYNA finite element analysis software is used to reproduce the existing near-field explosion test of the reinforced concrete (RC) masonry-infilled frame structure, which fully verifies the applicability of the adopted refined numerical simulation method. Combined with the hybrid element modeling method of building structures, a simulation analysis is carried out on the dynamic response of the three-story masonry-infilled RC frame under the explosion of typical warheads (100kg and 200kg TNT equivalent). The propagation of blast waves inside the structure and structural damage characteristics are investigated. Based on the equivalent single-degree-of-freedom (SDOF)method, the damage degrees of RC beams, columns, slabs and infill walls under blast loads are predicted, and a damage assessment method for building structures under internal explosions is established. Its applicability is verified by comparing with the refined numerical simulation results. It indicates that, under 100kg and 200kg TNT explosion conditions, the overall functionality and structural damage degrees of the building in the refined numerical simulation are both moderate and slight. The corresponding damage degrees obtained by the equivalent SDOF simplified assessment are consistent with the refined numerical simulation results. In addition, it can be seen from the damage degree of members that compared with load-bearing components, i.e. slabs, beams and columns, masonry infill walls are more prone to failure, resulting in a larger damage range of rooms in the horizontal direction within the floor.

Key words

internal explosions / masonry-infilled RC frame / refined numerical simulation / single degree of freedom / damage and failure

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CHEN Gongqing1, WU Hao1, OU Yuan2, WANG Fan2, L Jinxian1. Destruction analysis of RC frame structure with infill walls under internal explosion[J]. Journal of Vibration and Shock, 2025, 44(5): 289-301

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