节点半刚性对装配式框架的内力影响分析

Internal force analysis of precast frame under the influence of node semi-rigid

通过螺旋弹簧模拟节点连接的半刚性,推导了在节点转动刚度K不同时的单元刚度矩阵,并建立了装配式框架在竖向荷载作用下内力计算方法。研究表明:在节点半刚性的影响下,梁端弯矩有所降低,而跨中弯矩增加;当梁的线刚度与节点相对刚度之比ψ<0.033时,可按刚接计算框架内力;当ψ>4.02时,可按梁柱铰接来计算;当0.033≤ψ≤4.02时,则需考虑节点半刚性对框架内力的影响。

Through using spiral springs to simulate the semi-rigid of nodes connection, this paper developed the beam element stiffness matrix due to different rotation stiffness of the joints at beam end, and established the internal force analysis model of the precast frame under a vertical load, The results show that： under the influence of semi-rigid connection, the girder bending moment of the frame will decrease, while the mid-span bending moment increases; when the ratio of line stiffness of the beam and the relative node stiffness： ψ〈 0. 033, the internal forces of frameworks can be calculated through rigid connection; when ψ〉4. 02, the internal forces of frameworks can be calculated through hinged joint; when 0. 033≤ψ≤4. 02, the influence of node semi-rigid on internal forces of frameworks should be taken into account.