现行脚手架规范对双排扣件式脚手架的承载力计算是基于哈尔滨工业大学所做的整架试验得到的,缺少清晰的力学概念分析。为了从力学概念和模型分析上得到承载力计算公式,以理想的弹性支撑上轴心受压立杆模型为基础,分析了受大横杆弯曲变形影响的脚手架稳定承载力,得到了承载力的理论计算值。以理论分析的基本假设为条件建立了整架ANSYS分析模型,进行了特征值屈曲和几何非线性屈曲计算。结果表明大部分模型计算结果与现有规范比较偏于保守,误差在允许范围内。说明简化的力学模型及计算公式对于估计脚手架的稳定承载力具有工程上应用的可行性。ANSYS数值分析结果显示:脚手架整体失稳发生之前,某些立杆虽未达到极限承载力但各连墙件受到的反力差异较大,某些连墙件受到的反力明显大于规范所规定的不考虑风荷载时的抗拔力5KN。按规范计算所得到的承载力是偏于安全的,但连墙件抗拔力不够成为脚手架倒塌的重要原因之一。 The current scaffolding norms on the double-row fastener scaffold bearing capacity calculation is based on the Harbin Institute of Technology to do the entire test obtained, the lack of a clear mechanical concept analysis. In order to get the bearing capacity formula from the concept of mechanics and model analysis, based on the ideal elastic support upper shaft compression pole model, the stability of the scaffolding which is affected by the bending deformation of the big bar is analyzed, and the bearing capacity Theoretical calculation. Based on the basic assumptions of theoretical analysis, the whole ANSYS analysis model was established, and the eigenvalue buckling and geometric nonlinear buckling calculation were carried out. The results show that most of the model results are conservative compared with the existing ones, and the error is within the allowable range. Which shows that the simplified mechanical model and calculation formula have the feasibility of engineering application in estimating the stable bearing capacity of scaffolding. The ANSYS numerical analysis shows that although some of the uprights did not reach the ultimate bearing capacity before the overall instability of the scaffolding occurred, the reaction forces experienced by the various wall members were quite different, and the reaction forces on some of the wall members were significantly greater than those specified in the code The anti-pull force 5KN does not consider the wind load. According to the standard calculation of the resulting capacity is biased to safety, but not enough anti-pull wall parts has become one of the important reasons for the collapse of the scaffolding.