骨式钢框架梁柱连接节点显著屈服转角的研究

Research on yield rotation of moment connections with reduced beam section

在骨式钢框架结构基于滞回耗能的性态设计方法中,骨式连接节点显著屈服转角确定的是否精确直接影响结构整体滞回耗能确定的合理性。为了系统研究骨式连接节点显著屈服转角的量化方法及变化规律,采用ABAQUS有限元程序分析骨式连接节点在单向荷载作用下钢梁腹板厚度、钢梁翼缘厚度、钢梁高度、钢梁宽度、钢材强度等参数对节点显著屈服转角的影响,并采用通用弯矩法、等能量法、FEMA273法对骨式连接节点的显著屈服转角进行了计算。结果表明,钢梁腹板厚度、钢梁翼缘厚度、钢梁高度、钢梁宽度对骨式连接节点显著屈服转角影响较小,而钢梁的钢材强度对骨式连接节点的显著屈服转角影响较大。通用弯矩法及等能量法确定的骨式连接节点的显著屈服转角数值较大,FEMA273法确定的显著屈服转角最小,但同骨架曲线的拐点数值最为接近,建议具有明显拐点的骨式连接节点的显著屈服点可按FEMA273法确定。

In the performance-based seismic design method based on hysteretic energy of steel frame with reduced beam section （RBS）, the precise determination of the significant yield rotation angle of RBS connection has a direct effect on the reasonableness of structural hysteretic energy. In order to systematically study the determined method of yield rotation of RBS connection, the finite element program ABAQUS was used to analyze the influences of design parameters on the yield rotation angle of RBS connection, including of web thickness, flange thickness, height and width of the steel beam and steel strength. The general moment method, equal energy method and FEMA273 method also were adopted to determine the yield rotation angle of RBS connection. The results show that the web thickness, flange thickness, height and width of steel beam have slightly little influence on yield rotation angle of RBS connection, however, steel strength has significant effect. The yield rotation of RBS connection calculated by general moment method and equal energy method are larger than the FEMA 273 method. In addition, the yield rotation angle calculated by FEMA273 method is similar to the corner point of skeleton curve of RBS connection. In this paper the FEMA273 method was suggested to determine the yield rotation angle of RBS connection.