施工期多层模板支撑体系荷载传递规律分析与性能测试

发布时间：2018-06-03 06:26

本文选题：多层模板支撑体系 + 现场实测分析　；参考：《西安建筑科技大学》2013年硕士论文

【摘要】：由于城市建设快速发展，工程施工速度不断加快，在施工过程中，主体结构经常在没有达到设计强度要求时就开始进行上层结构的施工，因此多层模板支撑体系在施工中被广泛应用。但是由于对该体系认识的不全面，尤其对这种体系的受力性能等缺乏足够的了解，造成了在实际施工中对多层模板支撑体系配置的不合理、拆除时间和方式的不当等问题，由此引发了很多工程事故。在施工过程中，多层模板支撑体系把新浇筑的混凝土荷载以及施工荷载传递到已浇筑好的楼板上。混凝土结构和支撑构成了一个临时承载体系，它们共同承担施工时产生的荷载，混凝土结构和支撑的内力随时间和支撑形式的变化而改变。因此，多层模板支撑体系的研究对保证工程安全性具有十分重要的意义。本文以多层模板支撑体系为研究对象，在对多层模板支撑体系进行理论分析的基础之上，通过对西安市某实际工程的现场实测，得到了多层模板支撑体系立杆和楼板在整个施工过程中的内力时程曲线，证明了多层模板支撑体系是一个随时间和空间变化而变化的体系。同时，研究了该支撑体系的荷载传递规律以及模板支撑与混凝土楼板共同工作、相互作用的关系。通过有限元软件进行数值分析，计算结果和实测结果基本吻合，在规律上具有一致性，同时指出了数值计算结果与实测数据存在差异的原因。最后，介绍了一种多层模板支撑体系的简化分析模型，通过与实测数据和数值计算结果的比较，，可知运用该简化模型对多层模板支撑体系进行分析是可行的。本文研究成果对多层模板支撑体系的设计研究和施工具有一定的实际意义。
[Abstract]:Due to the rapid development of urban construction and the acceleration of engineering construction, during the construction process, the main structure often starts the construction of the upper structure when it does not meet the design intensity requirements. Therefore, multi-layer formwork support system is widely used in construction. However, due to the incomplete understanding of the system, especially the lack of sufficient understanding of the mechanical properties of the system, the unreasonable configuration of the multi-story formwork support system in actual construction, the improper time and manner of dismantling, etc. This led to a lot of engineering accidents. In the process of construction, the new concrete load and the construction load are transferred to the casted floor by the multi-story formwork support system. Concrete structure and bracing constitute a temporary bearing system, which jointly bear the load generated during construction, and the internal force of concrete structure and bracing changes with time and the form of bracing. Therefore, the research of multi-layer formwork support system is very important to ensure engineering safety. Based on the theoretical analysis of the multi-layer formwork support system, the field measurement of a practical project in Xi'an is carried out in this paper. The time-history curves of the internal force of the stand bar and floor slab in the whole construction process are obtained. It is proved that the multi-story formwork bracing system is a system varying with time and space. At the same time, the load-transfer law of the bracing system and the relationship between formwork bracing and concrete slabs are studied. The numerical analysis by finite element software shows that the calculated results are in good agreement with the measured data, and the reason for the difference between the numerical results and the measured data is pointed out. Finally, a simplified analysis model of multi-layer formwork support system is introduced. Compared with the measured data and numerical results, it is feasible to use the simplified model to analyze the multi-layer formwork support system. The research results of this paper have certain practical significance for the design and construction of multi-layer formwork support system.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU755.2

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