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ANALYSIS AND STUDY ON THE BEARING CAPACITY REDUCTION FACTOR OF COUPLER TALL FALSEWORK
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摘要: 以前人对扣件式钢管脚手架及模板支架的研究为基础,通过现场调研并借助有限元分析软件建立模型,深入分析扣件式高大模板支撑体系的纵距、横距、步距、扫地杆高度、竖直杆伸出顶端长度、水平加强层数量等构造因素对其稳定承载力的影响,并在此基础上建立了扣件式高支模稳定承载力与各因素之间的关系式。在同时考虑各因素的几何尺寸变异性以及初始缺陷随机性的情况下,推导出扣件式高大模板支撑体系稳定承载力的折减系数,进而得到实际承载力的计算公式,为扣件式高大模板支撑体系的方案设计与安全分析提供可靠的依据。Abstract: On the basis of the studies on coupler steel tube falsework by previous researches model is set up by investigating the spot and making use of finite element analysis software,and it analyses the mechanism deeply that how the constitution factors effect the stability bearing capacity of the falsework.The constitution factors include longitudinal distance,lateral distance,step length,height of the floor members,length of upright bars extruding from top and etc.And on this basis,a relational expression of stability bearing capacity and factors is also established.Considering the geometric variation of the factors and the randomness of the initial defects at the same time,it is deduced the reduction factor of the stability bearing capacity of the falsework.The calculation formula of the actual stability bearing capacity is obtained,which can supply a reliable basis for scheme design and safety analysis of the coupler tall falsework.
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[2] 袁雪霞.建筑施工模板支撑体系可靠性研究[D].杭州:浙江大学,2006. 胡长明,梅源,王雪艳,等.构造因素对高大模板支撑体系稳定承载力影响的研究[J].建筑技术,2009,40(2):143-146. [3] 杜荣军.混凝土工程模板与支架技术[M].北京:机械工业出版社,2004. [4] 胡长明.高大模板扣件式支撑体系施工技术研究[R].西安:西安建筑科技大学,2008. [5] 胡长明.扣件联接钢结构的试验及其理论研究[D].西安:西安建筑科技大学,2008. [6] 聂鑫,蒋傲宇,黄伟,等.扣件式钢管支模架系统承载力的灵敏度分析[J].工业建筑,2007,37(11):99-103. [7] 程维虎.拟合优度检验的回归分析方法及其应用[J].北京工业大学学报,2000,33(2):34-41. [8] British St and ards Institution,BS 5975∶1996. Code of Practice for Falsework[S]. -
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