扣件式钢管满堂脚手架承载力验算方法

Capacity calculation method of full hall steel tubular scaffold with couplers

扣件式钢管满堂脚手架由于其分析设计理论多以经验为主,缺乏理论依据,导致其坍塌事故时有发生。结合3个扣件式钢管满堂脚手架足尺破坏试验的试验现象和试验数据,得出其主要破坏模式,并基于此确定了扣件式满堂脚手架的主要计算内容。然后考虑直角扣件的半刚性,基于部分侧移半刚性假定,建立顶层受力水平杆抗弯承载力、立杆受压稳定承载力以及节点抗滑和极限承载力等关键受力构件和节点的计算方法。并将计算得到的承载力与试验结果对比,验证了此方法的可靠性,从而保证了此方法可在工程中推广使用。

The design and analyzing methods of the full hall steel tubular scaffold with couplers are mainly based on experiences, lacking of theoretical guidance, which may induce collapse accidents. Combined with test phenomena and data of full size rupture tests of three full hall steel tubular scaffold with couplers, the main failure modes were obtained and main calculation contents of full hall steel tubular scaffold with couplers were determined. Based on the partially-sway semi-rigid assumption theory, considering the semi rigidity of right angle couplers, calculation methods of key mechanical components and joints were established including the bending strength of top mechanical horizontal members, compression stability of vertical members, and slipping resistance and ultimate strength for couplers. The calculation bearing capacity and experiment data were compared to verify the reliability of this calculation method. This method can be promoted and applied in construction engineering.