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为了研究顶底角钢连接半刚性钢结构的抗震性能,介绍相关文献中角钢的屈服荷载及初始刚度的计算,基于角钢的拉压试验结果,验证角钢的屈服荷载及初始刚度计算方法的准确性并对角钢的屈服荷载计算公式进行修正,进而提出角钢在反复拉压荷载下的恢复力模型;编制角钢连接单元,提出基于有限元软件OpenSEES的顶底角钢连接半刚性钢结构的建模方法,对顶底角钢连接半刚性钢结构低周往复试验、振动台试验进行数值模拟,所得结果与试验结果进行比较,结果表明:该文提出的建模方法具有单元少、自由度少、建模方便、计算效率高、耗时少等优点,采用该文方法进行的数值模拟与试验结果吻合较好,精度能满足工程需求。
In order to study the seismic performance of semi-rigid steel structures connected with top and bottom corners, the yield load and initial stiffness of the angle steel in the relevant literature are introduced. Based on the results of tension and compression tests of the angle steel, the accuracy of the calculation method of the yield load and initial stiffness of the angle steel is verified The formula of yield strength of the angle steel is modified, and then the restoring force model of the angle steel under repeated tension-compression load is proposed. The angle steel connecting element is prepared and the modeling method of the semi-rigid steel structure connecting the top and bottom angle steel based on the finite element software OpenSEES is proposed. The result shows that the modeling method proposed in this paper has the advantages of less unit, less degree of freedom and convenient modeling, High computational efficiency and less time consuming. The numerical simulation using this method is in good agreement with the experimental results, and the accuracy can meet the engineering requirements.