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近年来高大模板支架坍塌事故频发,尽管此类结构的验收标准低、荷载离散性大,但有关概率极限状态设计法的研究还十分不足。以搭设高度在7.6 m~14.0 m较为常见的扣件式高大模板支架为研究对象,给出了极限承载力的非线性简化计算方法,对比足尺整架试验数据,研究计算模式不确定性的统计特性;通过对现场采样数据、已有试验数据和容许误差等的分析,得出了满足规范要求的随机参数的统计特性;通过1000次Monte Carlo模拟得到了10种常用高大模板支架极限承载力的统计特性;基于枚举优化法,找出了与目标可靠指标一致性最佳的荷载效应分项系数和抗力分项系数,并将采用该文所建议方法得到的设计结果与按英国规范、我国现行规范得到的设计结果进行了比较。研究成果可为制定新规范提供理论依据。
In recent years, high-profile formwork stent collapse accidents occur frequently. Although the acceptance criteria of such structures are low and the load dispersion is large, the research on the design method of the ultimate state of probability is not enough. In order to set up a relatively high fastener-type tall formwork bracket with a height of 7.6 m-14.0 m, a nonlinear simplified calculation method for ultimate bearing capacity is given. Compared with the full-scale test data, the uncertainty of calculation model The statistical properties of the random parameters which meet the requirements of the specification were obtained through the analysis of the sampling data in the field, the existing experimental data and the allowable errors. The ultimate bearing capacity of ten commonly used tall formwork brackets was obtained by Monte Carlo simulation of 1000 times Based on the enumeration optimization method, the partial coefficient of load effect and resistance sub-coefficient with the best consistency with the target reliability index are found out. The design results obtained by the proposed method are compared with those according to British Standard, China’s current norms to get the design results were compared. The research results can provide a theoretical basis for the development of new norms.