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在地震作用下,框架的刚性节点处于复杂的应力状态,在节点区域内,可能发生相当大的应力集中。因此,应当计算刚性节点边缘截面在计算内力作用下的强度。计算内力(M,Q,N)根据《Ⅱ-A,12-69》,按在特殊荷载组合下的节点以上柱截面的组合计算内力确定。在节点图(图1)上示出了在计算节点核心区时所考虑的内力,根据文献[1,2]的计算方法,横梁上的剪力和纵向力不予考虑。柱中的M,Q和N按下式取值:
Under the action of earthquakes, the rigid nodes of the frame are in a complex state of stress, and considerable stress concentration may occur within the nodes. Therefore, the strength of the edge section of the rigid node should be calculated in the calculation of the internal force. Calculate the internal forces (M, Q, N) According to “II-A, 12-69”, determine the internal force by the combination of the column sections above the nodes under the special load combination. The internal forces considered in calculating the core region of the node are shown in the node diagram (Fig. 1). According to the calculation methods of [1, 2], the shear and longitudinal forces on the beam are not considered. The M, Q and N values in the column are given by: