Dynamic analysis of anti explosion response of RC columns considering dynamic interface characteristics of CFRP and concrete

DOI:	10.11809/bqzbgcxb2023.02.016
Keywords:	CFRP reinforcement; RC column; contact algorithm; explosion simulation; K & C model
Abstract:	In order to study the anti explosion characteristics of reinforced concrete columns strengthened by CFRP, based on the meso analysis method of the interface strength between CFRP and concrete and the contact algorithm in LS DYNA, this paper proposes a parameter determination method of an interface contact model which can reflect the dynamic bond failure characteristics of the interface between CFRP and concrete. The dynamic response characteristics and failure process and mode of the RC columns strengthened by CFRP under explosion loading are analyzed, and the failure mechanism is revealed. The results show that, under the action of explosion loading, unidirectional and bidirectional CFRP sheets can reduce the peak horizontal displacement of the central part of the RC columns by 11% and 33% respectively, and reduce the plastic displacement by 10% and 72% respectively. The wrapped CFRP sheets in the plastic zone of the concrete columns have the most obvious effect. Compared with single layer reinforcement, the peak displacement and plastic displacement of the double layer reinforced RC columns reduce by 16.7% and 42.8% respectively. Considering the economy, distributed reinforcement is recommended for reinforcement of anti explosion RC columns.
Published:	2023-02-28
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