【作者】 谢楠； 王勇；

【Author】 XIE Nan WANG Yong (School of Civil Engineering & Architecture,Beijing Jiaotong University,Beijing 100044,China)

【机构】 北京交通大学土建学院；

【摘要】 近年来超高模板支架坍塌事故经常发生,其极限承载力不足是主要原因。本文通过分析模板支架这一临时结构的检查与验收标准,指出现行的计算公式没有充分考虑支架钢管自身较大的初始缺陷和支架搭设偏差。通过几何和材料非线性有限元理论计算,分析了不同初始弯曲条件对立杆极限承载力的影响,得出不同初始弯曲条件和钢管壁厚对应的稳定系数,给出修正后的立杆稳定承载力计算公式。并分析了不同的搭设偏差对超高模板支架立杆受力的影响。更多还原

【Abstract】 In recent years,the collapse accidents of high clearance scaffold support systems often happened,and the insufficient load-carrying capacity is the main reason.In this paper,according to the standard for the checking and accepting of scaffold supports,it is found that the initial imperfections of steel pipes and the building deviations have not been taken into account sufficiently in the formula.Their effects on load-carrying capacity are analyzed in teams of finite element method considering material nonlinearity and large deflection,and a new formula for load-carrying capacity of pipe is proposed.The stability coefficients for different initial curvatures and thicknesses of pipe are given.Finally the effects of different building deviations on vertical pipes are analyzed.更多还原