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该文基于钢筋混凝土柱构件的快速加载试验数据,分别采用CEB规范和Kulkarni和Shah建议的考虑应变率效应的混凝土动力本构关系,运用纤维模型建立了其动力纤维单元模型,并对单调快速加载下的构件的恢复力特性进行了数值模拟。与试验结果的比较表明所采用的两种动力本构模型均能够反映钢筋混凝土柱承载力随加载速率的提高而提高的特性,纤维模型提供了一种简便计算不同单调加载速率下混凝土柱的承载力的方法,验证了所建立的模型的有效性。基于此模型,对其中不同轴压比的两个试件在不同加载速率下的单调动力性能进行了数值模拟,分析加载速率对试样的动力承载力的影响。尽管两种动力本构模型在较低应变率水平下能够给出与试验结果吻合较好的结果,但随着应变率水平的提高,采用CEB规范以及Kulkarni与Shah建议的动力本构模型所得到的混凝土柱的承载力呈现一定的差异,欧洲规范CEB给出的结果要大。
Based on the fast loading test data of reinforced concrete columns, the dynamic constitutive equations of concrete considering strain rate effect proposed by Kulkarni and Shah were respectively adopted. The dynamic fiber unit model was established by fiber model, and the monotonic rapid loading Under the member of the restoring force characteristics of the numerical simulation. Compared with the experimental results, it is shown that the two dynamic constitutive models can reflect the increase of the bearing capacity of RC columns with the increase of loading rate. The fiber model provides a simple method to calculate the bearing capacity of concrete columns under different monotonic loading rates The method of force, validated the validity of the established model. Based on this model, the monotonic dynamic performance of two specimens with different axial compression ratios under different loading rates was numerically simulated, and the influence of loading rate on the dynamic bearing capacity of specimens was analyzed. Although the two dynamic constitutive models can give good agreement with the experimental results at lower strain rates, with the improvement of strain rate, using the CEB code and the dynamic constitutive model proposed by Kulkarni and Shah Of the concrete column bearing capacity showed some differences, the results given by the European norms CEB larger.