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村镇住宅碳纤维布减震技术研究及有限元分析

CFRP Absorbing Technique Research of Residential Housings and Finite Element Analysis

作者: 专业:结构工程 导师:王东炜 年度:2010 学位:硕士  院校: 郑州大学

Keywords

Structural seismic, Carbon fiber cloth, Finite element analysis, Modal analysis, Time-history analysis

        “5.12”汶川大地震使数以万计的村镇砖砌体房屋倒塌破坏,地震烈度高是原因之一,而另一重要原因则是村镇住宅房屋的抗震性能差,使得房屋在地震中不能抵抗地震力所带来的影响。我国村镇房屋主要的结构形式为砖砌体结构。砖砌体结构自重大;受到的地震作用比较强;砖砌体材料延性差、抗剪强度低。加之村镇房屋在建造时普遍设计不规范、施工质量不能保证。调查表明,我省大量的农村砖砌体房屋都未能按照规范要求设置圈梁、构造柱等减震措施。这就使得农村砖砌体房屋在地震中非常容易发生破坏。如何提高农村砖砌体结构,特别是未按照规范要求设置抗震措施的砖砌体结构的抗震性能,并对现有的村镇住宅提出较为合理的减震加固措施就显得非常必要。在国家“十一五”科技支撑计划“农村住宅规划设计与建设标准研究”的资助下,本论文进行了“村镇住宅抗震技术与标准研究”(2008BAJ08B14)子课题的研究工作。具体工作如下:(1)对未按规范要求设置构造柱的农村砖砌体房屋推荐了一种运用碳纤维布进行墙体和房屋加固的简易方法,并通过如下工作证明了本文推荐的方法是进行砖砌体墙体和房屋减震加固的有效措施之一。(2)用有限元软件分别建立了纯砖砌体墙体、碳纤维布加固墙体和设置构造柱墙体等三种分析模型模型。比较了三种墙体模型在水平荷载作用下的荷载—位移曲线,得出了碳纤维布加固墙体能有效减小墙体变形的结论。(3)分别对两层纯砖砌体房屋、碳纤维布加固房屋和设置构造柱房屋进行了模态比较分析和时程反应比较分析。模态比较分析结果表明碳纤维布加固砖砌体房屋的整体刚度可以得到有效提高。动力时程比较分析结果表明碳纤维布加固砖砌体房屋具有良好的抵抗地震力的能力。
    "5.12" Wenchuan earthquake had caused thousands of residential housings collapsed in towns and villages, strong seismic intensity of which is one reason, the other reason is poor seismic performance of residential housing in village, makes the housing in the earthquake can not resist the impact of the earthquake forces.According to a survey of towns and villages housing structure mainly is the type of masonry structure in our country, As the wall is mainly load-bearing element of masonry structure, and greater stiffness of its own, was relatively strong earthquake action in the earthquake. As masonry structure have some characteristics of its material itself:poor ductility, low shear strength and so on, coupled with s the design is not standardized, do’t guarantee the quality of construction when the construction of residential housing, and economic conditions of the reasons for it not set the basic ring beams, columns and other structural measures in a number of structural damping, there could make the housing is very prone to damage in the earthquake. How to improve the seismic performance of masonry structure housing, made of existing towns and villages housing propose more suitable damping becomes very necessary reinforcement measures.Therefore, this article is organized by the National Science and Technology Project "Rural Residential Planning Design and Construction Standards" in funding, pursue a research project of Residential housing Seismic Technology and Standards" (2008BAJ08B14). Analysis some of the characteristics of masonry structures using carbon fiber sheet reinforcement, and using the finite element tool take the static and dynamic analysis of single wall, the overall structure, proposed the feasibility of use CFRP reinforcement masonry structure housing.The main work is as following:(1) To residential housing a comparative analysis for some the common damping vibration isolation measures and reinforcement programs, identified the use of carbon fiber sheet reinforced masonry structure is more feasible damping reinforcement.(2) Using finite element analysis software established not be reinforced walls, adding carbon fiber cloth and accession structural column three cases the model, imposing on the load of the level of the same size, comparison of three kinds of conditions of the wall load-displacement curve, educe CFRP reinforcement wall can effectively reduce the structural deformation.(3) Select the seismic wave on the structure of housing for dynamic time-history analysis, comparison of three cases of displacement-time curve, and the peak of the total displacement time history, used for determine CFRP reinforcement for masonry can resist seismic forces, is a relatively feasible measures for seismic reinforcement.
        

村镇住宅碳纤维布减震技术研究及有限元分析

摘要4-5
Abstract5-6
目录7-10
1 绪论10-21
    1.1 研究背景与意义10-11
    1.2 国内外研究概况11-19
        1.2.1 国内抗震方法研究情况11-18
        1.2.2 国外砖砌体结构抗震加固方案研究情况18-19
    1.3 现有研究方法中的问题及本文的主要工作19-21
        1.3.1 现有研究方法中的问题19-20
        1.3.2 本文的主要工作20-21
2 砖砌体结构抗震加固方法及碳纤维布简介21-28
    2.1 砖砌体结构减震方法21-23
        2.1.1 建筑隔震21-22
        2.1.2 建筑减震22-23
    2.2 砖砌体房屋加固方法23-25
    2.3 碳纤维布加固的特点及其应用25-28
        2.3.1 碳纤维布的特性25-26
        2.3.2 碳纤维布的粘结材料26-27
        2.3.3 碳纤维布的加固特点27-28
3 碳纤维布加固墙体有限元分析28-39
    3.1 有限元分析模型28-29
        3.1.1 砖砌体有限元模型28-29
        3.1.2 钢筋混凝土有限元模型29
    3.2 砖砌体墙体有限元分析模型的建立29-36
        3.2.1 单元类型29-30
        3.2.2 材料属性30-32
        3.2.3 破坏准则32-33
        3.2.4 模拟构件概况33-34
        3.2.5 有限元模型34-36
    3.3 砖砌体墙体有限元计算结果与分析36-38
        3.3.1 荷载—位移曲线36
        3.3.2 砖砌体墙体的裂缝36-38
    3.4 结论38-39
4 碳纤维布加固砖砌体结构动力分析39-55
    4.1 引言39
    4.2 有限元分析模型39-43
        4.2.1 常用的动力分析模型39-40
        4.2.2 动力分析原理40-41
        4.2.3 本构关系41-42
        4.2.4 有限元模型的建立42-43
    4.3 碳纤维布加固砖砌体结构模态分析43-47
        4.3.1 模态分析的方法43-45
        4.3.2 模态分析的结果45-47
    4.4 多遇地震下加固砖砌体房屋有限元时程分析47-53
        4.4.1 时程分析法47-48
        4.4.2 时程分析动力方程48-50
        4.4.3 地震波的选择50-52
        4.4.4 时程分析计算结果52-53
    4.5 本章结论53-55
5 结论与展望55-57
    5.1 主要结论55-56
    5.2 展望56-57
参考文献57-60
致谢60
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