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钢箱梁广泛应用于大跨度桥梁及城市桥梁主梁结构,危险物品运输及恐怖袭击可能会对钢箱梁桥梁结构产生爆炸影响。目前我国现行桥梁规范尚未对爆炸荷载进行规定,国外桥梁规范也无详细规定缺少借鉴意义。该文设计了可灵活拆卸、重复使用的钢箱梁爆炸实验平台,并以Q235B钢材制作的单箱三室钢箱梁缩尺模型为研究对象,标定B炸药及钢材的力学性能后,相同炸药当量不同位置作用下,考查近爆冲击波对钢箱梁的局部破坏及整体影响特征,分析了顶板、底板及箱梁内部结构的破坏形态及冲击波传递过程。所进行的钢箱梁实验方案设计、实验平台及工况设计,可为爆炸实验提供设计借鉴,也可为其他学者进行爆炸作用结构有限元分析计算提供实例验证。
Steel box girders are widely used in the structures of long-span bridges and main girders in urban bridges. Hazardous materials transport and terrorist attacks may have an explosion effect on the structure of steel box girder bridges. At present, the current bridge norms of our country have not stipulated the explosion load, and there is no reference meaning for the detailed norms of bridge norms in foreign countries. In this paper, a steel box girder explosion experiment platform with flexible disassembly and reusable design was designed. The single-box three-compartment steel box girder scale model made of Q235B steel was taken as the research object. After calibrating the mechanical properties of B explosive and steel, the same explosive equivalent Under the action of different positions, the local damage of the near-blast shock wave to the steel box girder and its overall influence characteristics were investigated. The failure modes of the internal structure of roof, floor and box girder and the shock wave transmission process were analyzed. The experimental design, experimental platform and working condition design of the steel box girder can provide reference for the design of explosion experiment, and also can provide the example verification for other scholars’ structure analysis by FEM.