泡沫铝夹芯板加固山区跨泥石流桥墩抗冲结构优化研究

摘要

Bridge pier covered by buffer structure in mountain areas can effectively reduce the impact of debris flow,and protect itself.As an energy dissipation buffer material,the aluminum foam combined with steel plate was introduced to protect the bridge pier from the impact of debris flow.The mechanical properties of five different structural forms of sandwich panels were analyzed by static load test.The results show:the aluminum foam sandwich structure has a broad and flat range of energy buffer and dissipation which can absorb a large amount of impact energy;the double-layer aluminum foam sandwich structure is the best structural form by comparing the energy dissipation performance among the five different structural forms of sandwich panels.On this basis,an optimized structure was applied to the bridge pier across the debris flow,and the effect of engineering application is remarkable.%在山区跨泥石流桥墩外表面覆盖一层缓冲防护结构可有效减小泥石流冲击危害，达到保护桥墩的目的。为此，将泡沫铝作为一种耗能缓冲材料引入桥墩抗泥石流冲击领域，并将其与钢板组合为复合夹芯结构，采用静力压载试验对五种不同结构形式夹芯板的力学性能进行分析。结果表明：泡沫铝夹芯结构在进入屈服强度后有宽而平的耗能缓冲应力平台，可吸收大量的冲击能量；对比五种夹芯结构的耗能性能，确定未加入竖向钢板的双层泡沫铝夹芯结构为最优化的结构形式。在此基础上开展优化结构在跨泥石流桥墩上的示范应用，工程应用效果显著。