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实际工程中通过合理设计洞口尺寸可以迫使塑性铰在梁削弱截面处出现,避免节点先于构件发生破坏,保证结构的整体性使其免于倒塌,同时又可使室内管线从腹板空腔内通过,降低建筑层高,提高经济效益。在综合考虑了梁翼缘对腹板的约束要求、削弱截面处腹板的抗剪强度要求、梁端柱面处与削弱处截面的抗弯能力比以及防止受压板件局部失稳,可以确定矩形洞口尺寸大小和削弱截面距离柱表面的距离。梁腹板开洞后必然影响框架梁单元的刚度矩阵,从而影响结构的内力与位移。因此,有必要对腹板开矩形洞口框架梁单元的刚度矩阵进行研究。为了减少计算工作量,将梁单独作为一个杆单元,利用虚功原理推导其弹性刚度矩阵,并通过一算例与有限元结果进行了比较,两者结果吻合良好。
In the actual project, reasonable design of the hole size can force the plastic hinge to appear at the weakened cross section of the beam and prevent the node from being destroyed before the component to ensure the integrity of the structure so that it is free from collapse. At the same time, Through, reduce building height, improve economic efficiency. Considering the restraint requirements of the webs on the webs, the requirements of weakening the shear strength of the webs at the cross section, the bending resistance ratio of the beam ends to the weakened sections and the local buckling of the pressed plates can be determined, the size of the rectangular openings can be determined The size and weakening of the section from the surface of the column distance. Beam web hole will inevitably affect the stiffness matrix of the frame beam element, thus affecting the internal forces and displacement of the structure. Therefore, it is necessary to study the stiffness matrix of beam elements with rectangular openings in webs. In order to reduce the computational workload, the beam alone as a rod unit, using the virtual work principle to derive its elastic stiffness matrix, and by a comparison with the finite element results, the two agree well.