Numerical simulation analysis of Steel-concrete Vierendeel Sandwich Plate Composite Bridge under a close-in blast loading

This study utilizes the CEL finite element method to investigate the performance of the Steel-concrete Vierendeel Sandwich Plate Composite Bridge (SVSPB) under the close-range blasting load. The effectiveness of the method is validated by reproducing experiments from the literature through numerical simulation. A three-dimensional model of SVSPB is established using Abaqus to analyze various aspects such as vertical displacement, slip be-tween the reinforced concrete slab and the steel structure frame, failure mode, and material stress. The research findings indicate that: (1) SVSPB exhibits good ductility under explosive loads, as the overall structural frame-work retains a certain bearing capacity despite severe damage to the reinforced concrete slab. The structure also demonstrates favorable explosion venting performance. (2) Horizontal sliding occurs between the reinforced concrete slab and the steel frame in the absence of shear studs, highlighting the necessity of incorporating them. (3) During anti-riot design, attention should not only be given to the known weak points of the structure at the Bottom Chord nodes but also to the top chord nodes and stiffened plates of the main side beams on both sides. These findings offer reference in comprehending the dynamic response of SVSPB when subjected to explosive loads.