考虑节点半刚性与二阶效应的高大模板支撑体系分析模型

Analysis Model of High-formwork Support System Considering Semi-rigid Connection Characteristic and Second-order Effect

综合考虑节点半刚性与二阶效应的影响,建立了高大模板支撑体系的分析模型。首先推导了考虑节点半刚性连接特性与二阶效应的水平杆单元的刚度矩阵,然后推导了考虑二阶效应的立杆单元的刚度矩阵,在此基础上建立了高大模板支撑体系的分析模型,进而定量分析了节点半刚性与二阶效应对高大模板支撑体系的内力与位移的影响规律。分析结果表明,与一阶弹性分析相比,节点半刚性连接特性对高大模板支撑体系的二阶弹性分析结果影响显著;二阶效应对高大模板支撑体系的剪力和弯矩影响显著,甚至导致部分构件的剪力和弯矩变号;节点半刚性连接特性和二阶效应的耦合作用,对高大模板支撑体系的内力(特别是剪力和弯矩)和位移分布具有显著影响。

An analysis model of high-formwork support system was established by taking into account influences of both semi-rigid connection characteristic and second-order effect. The element stiffness of horizontal tube element which includes semi-rigid connection characteristics and second-order effect was developed first; then the element stiffness of upright tube element which involves second-order effect was developed. Based on the above two types of elements,an analysis model of high-formwork support system which involves both semi-rigid connection characteristics and second-order effect was established. Finally,the influences of semi-rigid connection characteristics and second-order effect on the internal force and displacement of high-formwork support system were analyzed. The analysis results show that semi-rigid connection characteristic has a significant effect on second-order elastic analysis comparing with the first-order elastic analysis. Meanwhile,second-order effect has a significant effect on internal force( especially shear force and bending moment),even change the direction of shear force and bending moment of some elements. Furthermore,the coupling between semi-rigid connection characteristics and second-order effect has a significant effect on redistribution of internal force and nodal lateral displacement.