钢管扣件式脚手架半刚性节点多参数模拟法

脚手架立杆的6个自由度在扣件节点处受到水平杆和斜杆的约束，该约束强弱是架体稳定承载性能的关键因素。为确定每项约束的作用，运用单参数敏感性分析和特征值屈曲分析方法，对其在架体稳定承载力上的贡献进行测量。基于对其贡献的相对效能分析，揭示出每项约束及对应水平杆、斜杆的作用机制。根据已公布的扣件实验测试数据，进行6项约束的实际效能初步分析，提出半刚性节点的多参数模拟方法。建立不同构造类型的模型，采用长度系数法、二阶线弹性分析法，通过对比扣件的计算受力状况与实验测试时所采用的荷载条件，对多参数模拟法取值方案的前提条件进行验证。在多参数法研究的基础上，列举和分析了半刚性节点常规单参数模拟方法的缺陷和局限。

Multi-parameter simulation method of semi-rigid node of steel tubular scaffold with couplers

Upright tube''s six degrees-of-freedom are constrained by horizontal tube and diagonal brace at the coupler connection joint, the strength of such constrains is the key factor of the stable bearing capacity of the scaffold. To determine the efficiency of the constraints, single factor sensitivity analysis and eigenvalue buckling analysis methods are applied to measure each constraints'' contribution on stable bearing capacity. The efficiency analysis results of their contributions indicated the constraint mechanism of horizontal tubes and bracing tubes. Reasonable effectiveness of six constrains is tentatively researched according to the published experimental data of couplers, and then a multi-parameter simulation method of semi-rigid node is proposed. The premise condition of the multi-parameter simulation method is validated by the comparison between the experimental loads and the the inner forces'' calculating results of the couplers, in which effective length method and linear elastic second-order analysis method are adopted. Accompanying with the research of multi-parameter simulation method, some common deficiencies or limitations of ordinary methods which are based on single parameter assumption are listed and analyzed.