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目前常用于爆炸荷载下钢筋混凝土柱动态响应分析的精细化模型,建模复杂、计算效率低,难以在大规模计算中应用。该文研究了纤维模型在模拟爆炸荷载下钢筋混凝土柱动态响应和破坏的缺陷,针对该缺陷在纤维模型的基础上引入弹簧单元,建立了爆炸荷载下钢筋混凝土柱动态响应分析的宏观模型,并给出了模型参数的确定方法。最后以某典型钢筋混凝土柱为例,分别通过精细化模型和宏观模型对其在不同爆炸工况下的动态响应和破坏进行对比分析,结果表明,提出的宏观模型在计算效率高的同时,能够明显弥补纤维模型的缺陷,达到和精细化模型相近的分析结果。
At present, the refined model, which is often used to analyze the dynamic response of reinforced concrete columns under blast load, has complicated modeling, low computational efficiency and is difficult to be applied in large-scale calculation. In this paper, the defects of the dynamic response and failure of reinforced concrete columns under simulated blast load are studied. A spring model is introduced to the defect based on the fiber model. The macroscopic model of dynamic response analysis of reinforced concrete columns under explosive load is established. The method of determining the model parameters is given. Finally, taking a typical reinforced concrete column as an example, the dynamic response and damage under different explosion conditions are compared and analyzed respectively by the refined model and the macroscopic model. The results show that the proposed macro model can calculate Obviously make up for the defects of the fiber model and achieve the analysis results close to the refined model.