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通过7个模型静力试验,分析了均布荷载作用下超高扣件式钢管满堂脚手架的失稳机理和破坏模式,以及顶层杆件扣件连接方式、立杆步距、扣件拧紧力矩、非加载区域等参数对满堂脚手架极限荷载的影响。通过与采用JGJ 130—2011《建筑施工扣件式钢管脚手架安全技术规范》中满堂脚手架承载力计算公式的计算结果对比,发现试验值是规范公式计算值的1.56~3.75倍,表明规范计算公式偏于保守。建立考虑扣件半刚性和杆件初弯曲的有限元分析模型,其分析结果与试验结果吻合较好,证明了有限元方法可精确预测扣件式满堂脚手架的承载力和破坏模式。根据有限元分析获得的顶层扣件连接摩擦力的分布规律,建议满堂脚手架顶层扣件抗滑承载力计算的不均匀系数取值1.51。
Through the seven models of static test, the instability mechanism and failure modes of full-height scaffolding of super-high fastener-type steel tube under uniform load are analyzed, and the connection method of top bar fastener, the stride of the pole, the tightening torque of fasteners, The influence of unloading area and other parameters on the ultimate load of full scaffolding. Through the comparison with the calculation results of the calculation formula of the full-scale scaffolding bearing capacity in JGJ 130-2011 “Technical Specifications for Safety of Steel Fasteners for Scaffolding of Construction Fasteners”, it is found that the test value is 1.56 ~ 3.75 times of the calculated value of the standard formula, indicating that the standard formula Conservative. The finite element analysis model considering the semi-rigidity of fastener and the initial bending of bar is established. The analysis results are in good agreement with the experimental results. It is proved that the finite element method can accurately predict the bearing capacity and failure mode of full-scale fastener scaffolding. According to the distribution law of the friction of top fastener connection obtained from the finite element analysis, it is suggested that the non-uniform coefficient of anti-slip bearing capacity of top-level fastener of full-scale scaffold be taken as 1.51.