超长混凝土结构温度应力及预应力技术分析

发布时间：2018-11-06 18:33

【摘要】：改革开放以来，我国经济取得了举世瞩目的成就，各地纷纷出现较多大型的公共建筑和工业建筑。为了达到建筑功能和外观上的需要，业主与建筑师往往要求这些建筑不设或少设伸缩缝，致使结构不设缝的长度远远超出了我国规范规定的限值，通常把这种结构称为超长混凝土结构。为了控制裂缝的发展，我国规范也给出了一些方法,同时规定当伸缩缝间距增大较多时，尚应考虑温度变化和混凝土收缩对结构的影响。对于超长混凝土结构温度荷载和温度应力目前还缺乏系统的研究和论述，但这种结构却越来越被现代工程界所采用，所以对其进行研究具有重要意义。本文在已有研究成果的基础上,借鉴部份学者的研究方法,采用理论分析和实际工程相结合,以某广播影视文化产业城工程为例，对超长混凝土结构温度应力及预应力技术进行了分析研究。研究内容包括：根据本工程特点及结构实际情况，采用MIDAS软件对超长混凝土进行了温度应力分析，得出了结构内部产生的温度应力；为了抵抗温度应力和收缩裂缝，在混凝土结构施加相应预压应力，，掺加膨胀剂、纤维，设置后浇带，起到了很好的效果；通过对预应力设计方案进行分析比较，提出了最优的预应力设计方案；通过该工程施工阶段及后期的监测结果表明，本工程温度分析及采取的预应力方案等各项措施是有效的，预应力施工效果达到了设计的要求，为类似工程提供了参考依据。
[Abstract]:Since the reform and opening up, China's economy has made remarkable achievements, many large public buildings and industrial buildings have appeared in various places. In order to meet the needs of building function and appearance, the owners and architects often require these buildings to set up no or less expansion joints, resulting in the length of the structure without joints far exceeding the limit specified in the code of our country. This kind of structure is usually referred to as super long concrete structure. In order to control the development of cracks, some methods are also given in our code. It is also stipulated that the influence of temperature change and concrete shrinkage on the structure should be considered when the expansion joint spacing increases. There is no systematic research and discussion on temperature load and thermal stress of super-long concrete structure at present, but this kind of structure is more and more used in modern engineering, so it is of great significance to study it. On the basis of the existing research results, this paper uses the research methods of some scholars for reference, combines the theory analysis with the practical engineering, and takes the project of a radio, television and film culture industry city as an example. The temperature stress and prestressing technology of super long concrete structure are analyzed and studied. The research contents are as follows: according to the characteristics of the project and the actual situation of the structure, the temperature stress of the super-long concrete is analyzed by using MIDAS software, and the temperature stress generated in the structure is obtained. In order to resist the temperature stress and shrinkage crack, the concrete structure is subjected to the corresponding preloading stress, the addition of expansion agent, fiber, and the setting of post-pouring belt, which plays a very good effect. Through the analysis and comparison of the prestress design scheme, the optimal prestressing design scheme is put forward. Through the monitoring results of the construction stage and later stage of the project, it is shown that the temperature analysis and the prestress scheme adopted in this project are effective, and the effect of prestress construction meets the requirements of the design. It provides reference for similar projects.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU37

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