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通过数值模拟研究了爆炸压力时程荷载加载在0号块位置下桥梁结构整体响应及其变形特性,并通过改变主梁混凝土材料的强度、爆炸荷载曲线,对材料参数、加载大小、加载速率等因素进行分析。得出了爆炸荷载位于支点附近截面时,一般造成桥梁结构爆点附近的局部变形;混凝土强度的提高,在结构发生整体变形及大面积局部变形的时候有利于结构抗爆;加载速率越大,变形效应越大;在加载冲量相等的情况下,随着加载峰值超压的增大,变形效应也将增大。文章研究结论可为桥梁结构的抗爆设计以及综合防护提供参考。
Through the numerical simulation, the overall response and deformation characteristics of bridge structure under the load of blasting time-history load are studied. By changing the strength and blast load curve of concrete girder, the influence of material parameters, loading size, loading rate and so on Factors for analysis. The results show that the local deformation near the explosion point of the bridge structure is generally caused when the explosive load is located near the fulcrum. The improvement of concrete strength is beneficial to the antiknock of the structure when the overall structural deformation and large-area local deformation occur. The greater the loading rate, The greater the deformation effect; under the same load impulse, the deformation effect will also increase with the increase of the peak overpressure. The conclusion of the article can provide a reference for antiknock design and comprehensive protection of bridge structure.