构造因素对高支模承载力稳定性影响的工程应用研究

发布时间：2018-04-26 02:23

本文选题：高大模板支撑体系 + 承载力稳定性　；参考：《安徽建筑大学》2015年硕士论文

【摘要】：随着我国国民经济水平的不断发展,土木工程施工工艺水平得以持续的提高。造型复杂化以及功能多样化的发展目标,已经成为现代高层建筑发展趋势。在建筑工程中,利用高大模板支撑体系施工的现浇混凝土结构频繁出现,且在工程中得以广泛的推广应用。钢管脚手架支撑体系被多次应用在高支模体系中,但高支模内架支撑体系承载力稳定性是施工的难题。与普通模板工程支撑体系相比,高大模板工程支撑体系的特点是:当前在高支模施工技术中,关于此类模板工程的施工技术规程相对较为缺乏,而且关于钢管脚手架模板支撑体系的架体设计,以及施工规范相对不完备,仅对架体中斜杆提出了相关构造要求,并未作设计深化计算要求。施工过程中很大程度上依靠工程经验,再加上由于地基基础下沉,以及设计计算和施工管理措施不当等原因,致使架体支撑系统失稳导致的倒塌而发生重大安全事故并不罕见。因此,如何有效的预防高支模内架承载力失稳是施工中的关键技术问题之一。本文结合某工程实例现场调研,并且借助有限元分析软件SAP2000,进行了以下几个方面的研究工作:(1)整理了国内外研究人员对扣件式钢管脚手架以及模板支架工程的研究现状,简要分析了高大模板扣件式钢管内架承载力失稳的成因和破坏特征。(2)结合规范推荐的架体杆件受力计算方法,全面对高大模板内架支撑体系的极限受压承载力进行理论分析。(3)结合某高支模工程实例,从施工要求以及技术保证条件、施工计划等各个方面进行施工部署计算分析,是在实际工程中的具体实施应用。(4)针对该工程高大模板支撑体系的纵距、横距、步距、扫地杆的高度、竖直杆超出顶端长度、水平和竖向剪刀撑加强层的间距等构造因素的变化,分析研究这些因素对几何尺寸体系不变扣件式钢管模架稳定承载力产生的影响。(5)结合有限元软件和现场数据监测的结果计算分析,得到了保证高大模板扣件式钢管内架支撑体系的承载力稳定性条件,给出了具体设计和施工中注意的问题和合理化建议。(6)分析高大模板扣件式钢管内架支撑体系中,各种构造因素对承载力稳定性的影响。在工程施工环节中,应采取积极有效的措施并严格按照相关规范规程执行,以确保施工安全。
[Abstract]:With the development of our national economy, the construction technology level of civil engineering has been continuously improved. The development target of complex modeling and diversified functions has become the development trend of modern high-rise buildings. In building engineering, cast-in-place concrete structures constructed with tall formwork support system appear frequently and are widely used in engineering. Steel tube scaffolding bracing system has been used in high support formwork system for many times, but the stability of bearing capacity of high support mould inner frame bracing system is a difficult problem in construction. Compared with ordinary formwork support system, the characteristics of tall formwork support system are: at present, in the construction technology of high supporting formwork, the construction technical specification of this kind of formwork is relatively lacking. Moreover, the frame design of steel tube scaffolding formwork bracing system and the construction code are relatively incomplete. Only the relevant structural requirements for the inclined bar in the frame body are put forward, but the design deepening calculation requirements are not made. In the process of construction, it is not uncommon to rely on engineering experience to a great extent, and because of the subsidence of foundation foundation, the improper design, calculation and construction management measures, and so on, which results in the collapse of frame bracing system. Therefore, how to effectively prevent the bearing capacity instability of high-support mould is one of the key technical problems in construction. In this paper, with the help of the finite element analysis software SAP2000, the research status of fastener steel tube scaffolding and formwork scaffold is sorted out in this paper, which is based on the field investigation of a project case, and the following research work is done in the following aspects: (1) domestic and foreign researchers' research status of fastener type steel tube scaffolding and formwork support. This paper briefly analyzes the cause of failure of bearing capacity of tall formwork fastener steel tube and its failure characteristics. This paper makes a theoretical analysis on the ultimate compressive bearing capacity of the support system of the inner frame of the tall formwork in an all-round way. Combined with an example of a high-supported formwork project, the construction deployment calculation and analysis are carried out from various aspects, such as construction requirements, technical guarantee conditions, construction plan, and so on. It is the concrete implementation in the actual project. 4) aiming at the vertical distance, the transverse distance, the step distance, the height of the sweeping pole and the vertical bar exceeding the top length of the support system of the tall formwork of the project, Changes in structural factors, such as horizontal and vertical shear braces, spacing between strengthened layers, The influence of these factors on the stable bearing capacity of the steel tube die frame with invariable fastener is analyzed. The results of finite element software and field data monitoring are calculated and analyzed. The stability condition of bearing capacity of tall formwork fastener type steel tube inner frame bracing system is obtained, and the problems that should be paid attention to in the design and construction and the reasonable suggestion .6) are given to analyze the high formwork fastener steel tube inner frame bracing system. The influence of various structural factors on the stability of bearing capacity. In order to ensure construction safety, active and effective measures should be taken and carried out strictly in accordance with relevant codes and regulations.
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU755.2

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