考虑高层建筑的钢结构节点承载力三维构建设计研究

Research on three-dimensional construction design considering the bearing capacity of steel structure nodes in high-rise buildings

传统的建筑有限元网格划分、基于SMMS模型的节点承载力分析方法,没有考虑状态变量,而导致建筑物的荷载分析结果与实际不符等问题。为此,提出了基于高层建筑的钢结构节点承载力三维构建设计。根据建筑物竖向和水平荷载作用下的弯矩,对高层建筑物钢结构框架的节点所受力的机理进行分析。构建高层建筑钢结构框架节点三维模型和有无支管情况下的有限元模型,分析有无支管有限元模型的荷载-位移关系,确定构建过程中节点参数与支管的关联性。计算模型单元上下端状态变量的传递关系,整合状态变量,确定钢结构框架荷载,并以此作为依据进行失稳判定,完成钢结构框架节点承载力分析。由实验结果可知,该方法在X、Y、Z三个方向的承载力与实际值最大分别相差2 kN、1 kN和1.5 kN,具有精准分析结果。

The traditional finite element mesh division and SMMS model based node bearing capacity analysis methods for buildings do not consider state variables, resulting in problems such as inconsistent load analysis results with reality. Based on this, a three-dimensional construction design for the bearing capacity of steel structure nodes based on high-rise buildings is proposed. Based on the bending moment under vertical and horizontal loads of the building, the mechanism of the forces acting on the nodes of the steel structure frame of high-rise buildings is analyzed. We construct a three-dimensional model of steel structure frame nodes in high-rise buildings and a finite element model with or without branches, analyze the load displacement relationship of the finite element model with or without branches, and determine the correlation between node parameters and branches during the construction process. We calculate the transitive relation of the state variables at the upper and lower ends of the model element, integrate the state variables, determine the load of the steel structure frame, and use this as the basis to determine the instability, and complete the bearing capacity analysis of the steel structure frame node. According to the experimental results, the maximum difference between the bearing capacity of this method in the X, Y, and Z directions and the actual value is 2 kN, 1 kN, and 1.5 kN, indicating accurate analysis results.