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分析了高宽比较大的扣件式钢管脚手架的受力特点,用弹簧单元替代直角扣件这种特殊的半刚性连接方式,引入弹簧单元的伸缩系数及转动刚度,建立了线弹性格构式柱计算模型,利用半刚性连接的钢框架模型计算单位水平力作用下层间相对位移,推导出该模型的失稳屈曲荷载计算公式。对高宽比等于27.3的扣件式钢管脚手架,采用MIDAS GEN有限元软件建立模型进行数值分析,获取失稳屈曲荷载值,并对比简化计算结果,可知公式的计算精度能满足工程设计及校核的需要。
The force characteristics of the fastener-type steel tube scaffolding with high aspect ratio are analyzed. The special semi-rigid connection with the spring element instead of the right-angled fastener is introduced and the spring-elastic coefficient and rotational rigidity are introduced to establish the linear elastic lattice Column model, the semi-rigidly connected steel frame model is used to calculate the relative displacement between layers under unit horizontal force, and the buckling load calculation formula of the model is deduced. For the fastener-type steel scaffold with the aspect ratio equal to 27.3, the numerical analysis was carried out by using MIDAS GEN finite element software to obtain the buckling load value under buckling, and compared with the simplified calculation result, it can be seen that the calculation accuracy of the formula can meet the engineering design and check Need.