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摘要
Composite beams containing shear connectors are mostly used in bridge structures. Accidents may cause damage to the bridge structure due to vehicle explosion impact. At the same time,some abandoned bridges must be demolished by blasting. Based on this background,it is necessary to conduct an explosion analysis of a bridge structure containing shear connectors. First,ABAQUS was used to verify the rationality of the fluid-solid coupling model considering the high strain rate-related concrete constitutive and steel constitutive with reference to the explosion test in the existing literature. Then,the fluid-solid coupling numerical simulation was carried out for the composite beams with corrugated steel plates,perforated steel plates and bolted shear connectors under the action of explosion load,and the failure modes of the composite beams with three different shear connectors were studied. The results show that under the blast load of 2 kg spherical TNT,the concrete inside the composite beam connector is deleted,the concrete outside is spalling,and the concrete on the left and right sides near the explosion point has a large plastic damage. The damage of the steel plate connector is mainly concentrated at the joint of the round hole and tenon. During the explosion,the top of the stud connector is significantly impacted,and the bottom is sheared. For steel plate connectors,the addition of steel bars in the concrete tenon can effectively reduce the damage at the opening of the steel plate. The displacement of the bolted composite beam is the smallest. After the explosion peak,because the bolt is a flexible connector and interacts with concrete,the vibration speed is minimum and the energy absorption effect is good. The steel plate connector is a rigid connector with strong impact resistance and low peak vibration velocity. The research results can provide reference for anti-blasting and blasting demolition of bridge structures and other engineering structures. ? 1994-2023 China Academic Journal Electronic Publishing House.
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