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摘要随着我国经济建设的迅速发展和建筑技术水平的提高，超长混凝土结构（长度超过了规范规定的最大值且不设伸缩缝）在大型公共建筑和工业建筑中不断出现。对超长混凝土结构的温度及收缩效应，若在设计中处理不当，将使结构产生裂缝，严重者将影响结构的正常使用。我国结构设计中多数是通过构造措施来考虑温度及收缩作用。因此，温度及收缩问题是超混凝土结构设计中的重要研究课题之一。65350
本文采用数值分析方法，以某城市单建地下停车场为背景工程，通过有限元软件ANSYS建立了超长混凝土框架剪力墙结构的实体模型，并对其在温度及收缩作用下的效应进行了分析；着重对结构的变形规律进行分析，并在柱、板、主梁、次梁、剪力墙构件中分别选取了20、24、22、24、12条路径，对这些路径上的应力变化进行分析研究，得出了应力变化规律；对通过改变配筋率和按一定原则加设膨胀加强带的超长框架剪力墙结构分别进行了有限元模拟，分析结果表明：增加配筋率不能引起结构应力的明显变化，而加设膨胀加强带能够有效降低结构的温度及收缩应力。根据数值分析结果，提出了降低超长混凝土框架剪力墙结构温度及收缩应力的措施。
毕业论文关键词：超长框架剪力墙结构；裂缝；温度；收缩；应力；膨胀加强带
毕业设计说明书（论文）外文摘要
Title Stress Analysis of Over-length
Concrete Structure and Crack Control Research
Abstract
With the development of economic construction and building technique ，the ultra-length concrete structures(the length of seamless structure oversteps the value our country Code prescribed) are built more and more for large public buildings and industrial buildings . If temperature and shrinkage deformation are handled badly during designing an ultra-length reinforced concrete structure , it won’t work properly . Most of the temperature and shrinkage effects are considered by structural measures in our country’s design . As a result , temperature and shrinkage problem is one of the most important research topics in ultra-length structural design.
This paper adopted numerical analysis methods. In the project background of a certain single-built underground parking lot, this paper established a solid model for an ultra-length concrete frame shear wall structure by the finite element software ANSYS ,and took a deep analysis for temperature and shrinkage loads ; This paper focused on the structure deformation analysis, and selected 20、24、22、24、12 paths in Columns、 plates、main beam、secondary beam、shear wall members as well as analyzed stress change on these paths , obtained stress variation law ; Then this paper took the finite element simulation for the ultra-length frame shear wall structure by changing reinforcement ratio and setting several additional enhanced expansion strips according to certain principles respectively. The results showed that improving reinforcement ratio can’t induce obvious changes in structural stress, but several additional enhanced expansion strips can reduce the temperature and shrinkage stress effectively. According to the numerical results , this paper presented some measures to reduce temperature and shrinkage stress for ultra-length concrete frame shear wall structure .
Key words: over long frame shear wall structure ; crack ; temperature ; shrinkage ; stress ; expansion reinforcing strips
目 录
第一章 绪论 1
1.1 前言 1
1.2.1 超长混凝土结构温度应力研究现状