扣件式高大模板支撑体系的稳定性分析

发布时间：2018-05-26 23:06

  本文选题：扣件式高大模板支撑体系 + 节点半刚性　； 参考：《广西大学》2014年硕士论文

【摘要】：随着社会经济的快速发展,高大模板支撑体系越来越多地应用于大空间、大跨度结构的施工过程。但由于高大模板支撑体系属于临时承载体系,传力路径和计算模型复杂,而且影响因素较多,一旦其稳定性不能得到保障,往往导致施工中的建筑工程发生坍塌,造成巨大的人员伤亡和财产损失。因此,针对高大模板支撑体系的受力特点,围绕高大模板支撑体系的分析模型和稳定承载力分析开展研究,对于高大模板支撑体系的设计与安全评估具有重要意义。本文根据高大模板支撑体系的受力特点,综合考虑节点半刚性连接特性与二阶效应的影响,建立了高大模板支撑体系的分析模型,进而对其稳定承载力与构造措施进行了系统分析,主要研究内容包括：1、基于理论分析,推导了考虑节点半刚性连接特性与二阶效应的水平杆单元以及考虑二阶效应的立杆单元的刚度矩阵,在此基础上建立了高大模板支撑体系的有限元分析模型,进而对高大模板支撑体系的内力与位移进行了分析。分析结果表明,节点半刚性连接特性和二阶效应的耦合作用,对高大模板支撑体系的内力重分布与节点侧移具有显著影响。2、综合考虑节点半刚性连接特性与二阶效应的影响,建立了高大模板支撑体系的稳定刚度方程,基于特征值屈曲分析对高大模板支撑体系进行了稳定承载力分析,并定量分析了节点半刚性的初始转动刚度与剪刀撑的设置对高大模板支撑体系稳定承载力的影响规律。分析结果表明,节点半刚性的初始转动刚度对高大模板支撑体系的稳定承载力具有显著影响,而设置剪刀撑可以显著提高高大模板支撑体系的稳定承载力。3、基于高大模板支撑体系的分析模型,定量分析了水平杆步距、立杆间距、扫地杆高度、立杆伸出扫天杆长度及剪刀撑等构造措施对高大模板支撑体系稳定承载力的影响,并对国家规范《建筑施工扣件式钢管脚手架安全技术规范》(JGJ130-2011)和广西地方标准《建筑施工模板及作业平台钢管支架构造安全技术规范》(DB45/T618-2009)中的相关构造措施进行了分析和校准。最后基于定量分析结果,给出各种构造措施的合理建议。
[Abstract]:With the rapid development of social economy, tall formwork support system is more and more used in the construction process of large space and long span structure. However, because the large formwork support system belongs to the temporary bearing system, the load transfer path and the calculation model are complex, and there are many influencing factors. Once its stability can not be guaranteed, it often leads to the collapse of the construction project in construction. Causing huge casualties and property damage. Therefore, according to the stress characteristics of tall formwork bracing system, the research on the analysis model and stability bearing capacity of tall formwork bracing system is of great significance for the design and safety evaluation of tall formwork bracing system. According to the mechanical characteristics of tall formwork bracing system and considering the influence of semi-rigid connection characteristics and second-order effect, the analysis model of tall formwork bracing system is established in this paper. Furthermore, the stability bearing capacity and structural measures are systematically analyzed. The main research contents include: 1, based on theoretical analysis, The stiffness matrix of the horizontal bar element considering the semi-rigid connection characteristic and the second-order effect of the node and the standing bar element with the second-order effect are derived, and the finite element analysis model of the tall formwork bracing system is established. Then the internal force and displacement of tall formwork bracing system are analyzed. The results show that the coupling effect of the semi-rigid connection and the second-order effect has a significant effect on the internal force redistribution and the lateral displacement of the large formwork bracing system. The effects of the semi-rigid connection characteristics and the second-order effect are considered comprehensively. The stability stiffness equation of tall formwork bracing system is established, and the stability bearing capacity of tall formwork bracing system is analyzed based on eigenvalue buckling analysis. The influence of the initial rotational stiffness of semi-rigid joints and the setting of scissors brace on the stability bearing capacity of tall formwork bracing system is analyzed quantitatively. The results show that the initial rotational stiffness of semi-rigid joints has a significant effect on the stability bearing capacity of tall formwork bracing system. The stable bearing capacity of tall formwork bracing system can be improved significantly by setting scissors brace. Based on the analysis model of tall formwork support system, the horizontal pole step distance, standing pole spacing and floor sweeping bar height are quantitatively analyzed. The influence of the structural measures such as the length of the vertical pole and the scissors brace on the stable bearing capacity of the tall formwork bracing system, This paper also analyzes and calibrates the relevant construction measures in the national code "Safety Technical Code for Steel Tube scaffolding of fastener Type of Building Construction" (JGJ130-2011) and the "Technical Code for Safety of Steel Pipe support structure of Building Construction template and working platform" in Guangxi Local Standard "DDB45 / T618-2009". Finally, based on the results of quantitative analysis, reasonable suggestions of various construction measures are given.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU755.2
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本文编号：1939308