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| Numerical Simulation Study on Damage Characteristics of Reinforced Concrete T-Beam Bridge Under Blast Point Control |
| ZHANG Qiang1， CHEN Zhenhua2， WANG Wenlong1，
SU Huaiwei1， CHI Dejian1 |
| 1. Shanghai Electro-Mechanical Engineering Institute， Shanghai 201109， China；
2. Chongqing Hongyu Precision Industry Group Co.， Ltd.， Chongqing 402760， China |
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Abstract To study the dynamic response and damage mode of reinforced concrete T-beam bridges under the control of penetrating ammunition explosion points, a three-dimensional separated reinforced concrete finite element model was established using the AUTODYN fluid structure coupling algorithm to simulate the damage characteristics of steel-concrete T-beam bridges numerically. On this basis, the damage characteristics of reinforced concrete T-beam bridges under the action of explosive charges at different explosion points were analyzed, and the dynamic response process of T-beam structures from concrete cracking, bottom layer cracking damage, steel yield, to local deflection of rib plates was reasonably presented. The research results show that, with a change in the blasting point, the T-beam rib plate exhibits a relatively severe deformation. The center deflection of the rib plate gradually increases with the downward offset of the blasting point, especially in the range of 1/4 to 1/2 below the main beam, where the damage is most severe. However, when the blasting point continues to move downward, the deflection of the T-beam rib plate gradually decreases. There is a maximum value of deflection associated with the movement of the blasting point, indicating an optimal blasting point. The research results can provide a reasonable basis for determining the penetration time of the explosive warhead and serve as a reference for improving the degree of bridge damage.
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Received: 27 August 2024
Published: 31 October 2025
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2025, Vol. 8 
