不同加载速率下钢筋混凝土梁的LS-DYNA数值研究

摘要

准确认识高应变率荷载作用下混凝土的受力性能以减少损伤的发生具有重要意义.由于实验研究的复杂性和较高的成本,数值研究是适合的方法.因此,本文采用LS-DYNA软件对有限元法在不同荷载作用下预测混凝土性能的能力进行评价.首先,给出该方法;然后,在不同条件下分3个阶段进行验证.荷载-跨中位移的计算结果表明,试验结果与有限元结果吻合较好.利用有限元方法对不同载荷作用下的梁进行分析,验证有限元方法在不同载荷下的受力分析能力.此外,该方法对不同加载速率、不同加载条件下钢筋混凝土梁的性能也具有较好的评价能力.%Having an accurate understanding of concrete behavior under effects of high strain rate loading with the aim of reducing incurred damages is of great importance. Due to complexities and high costs of experimental research, numerical studies can be an appropriate alternative for experimental methods. Therefore, in this research capability of the finite element method for predicting concrete behavior at various loading conditions is evaluated by LS-DYNA software. First, the proposed method is presented and then is validated in three stages under different conditions. Results of load-midspan displacement showed good agreement between experimental and finite element results. Capability of finite element method in analyses of beams under various rates of loading was also validated by low error of the results. In addition, the proposed method has reasonable ability to evaluate reinforced concrete beams under various loading rates and different conditions.