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钢纤维混凝土剪力墙非线性有限元分析

Non-Linear Fem Analysis of Steel Fiber Reinforceo Concrete Shear Walls

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

Keywords

steel fiber reinforced concrete, shear wall, finite element, nonlinear, capacity, ductility

        随着科学技术的进步和城市化进程的加快,高层建筑已成为城市基础设施的主要建筑形式,高层建筑结构也成为常见的结构形式,其受力性能也越来越受到工程设计人员和研究人员的关注。剪力墙结构具有良好的抗震性能,较大的抗侧刚度,能有效减小建筑物侧移等优点,在高层建筑中得到了广泛的应用。目前对于钢纤维混凝土剪力墙的研究成果比较少,关于钢纤维混凝土剪力墙的非线性有限元分析理论的研究也比较少见。本文在13片剪力墙的试验结果基础上,基于钢纤维混凝土的特点,对钢纤维混凝土剪力墙的非线性有限元分析方法进行了研究,并利用有限元分析程序进行研究。主要做了以下几方面的工作:(1)根据钢纤维混凝土剪力墙的试验成果,建立了合理的有限元分析模型,并且根据材料特性和受力方式,选用合理的本构关系和参数,采用分步施加荷载的方法来模拟试验时的低周反复荷载,进而选用合理的破坏准则和收敛准则及正确的求解器;(2)利用钢纤维混凝土剪力墙在低周反复荷载作用下的有限元分析程序,进行了数值计算,得到了钢纤维混凝土剪力墙的裂缝分布、应力应变云图、滞回曲线、骨架曲线等,并和试验结果进行对比,数值模拟的结果和试验结果吻合良好,证明了本程序及所选本构模型、参数的合理性;(3)综合有限元分析结果和试验结果,分析了钢纤维混凝土强度和钢纤维体积率对钢纤维混凝土剪力墙受力性能的影响;(4)分析了钢纤维混凝土剪力墙的高宽比,钢纤维混凝土强度和钢纤维体积率对其承载力和延性性能的影响。
    With the advancement of science and technology, and the speed-up of urbanization process, high-rise buildings have become the main form of urban infrastructure, high-rise building also has become the common structure, and the mechanical behavior of high-rise building was be concerned by designers and researchers more and more. Shear wall structure have good seismic performance and lager lateral stiffness, it can reduce the sway of building effectively, so the shear wall structure has been used in high-rise buildings widely. But, there is less research of steel fiber reinforced concrete shear walls now-days, and the theoretical research of nonlinear finite element analysis which in steel fiber reinforced concrete shear walls was also seldom.This text was based on the test results of 13 shear walls, and also based on the characteristics of steel fiber reinforced concrete, in this paper it has researched the method of nonlinear finite element analysis which in steel fiber reinforced concrete shear walls, and also has wrote the program of finite element analysis, the main contents in this text was:(1) Describes finite element analysis in steel fiber reinforced concrete shear wall current status of research, According to this test, build and test prototypes match the finite element model, and material properties and force to choose a reasonable constitutive model, and using practical parameters. Test uses a low-cycle loading, the finite element analysis with step set out to simulate the low-cycle loading, and select reasonable failure criterion and convergence criteria and correct solver;(2)Prepared shear wall of steel fiber reinforced concrete in low cyclic Loads ANSYS analysis program, have the results of shear cracks in the distribution and stress and strain cloud, the hysteresis curve, and so on.according to compared to the experimental results, to verify the feasibility of the program, numerical simulation and experimental results, good agreement;(3) Comprehensive finite element analysis and experimental results on impact of steel fiber reinforced concrete shear wall under the influence factors are analyzed. The main factors analysis is concrete strength and steel fiber volume fraction, and analysis these factors on the walls of the internal force distribution;(4) Analysis the Aspect ratio of steel fiber reinforced concrete shear wall is influent the bearing capacity and ductility.
        

钢纤维混凝土剪力墙非线性有限元分析

中文摘要4-5
ABSTRACT5-6
1 绪论10-15
    1.1 研究背景10-11
        1.1.1 剪力墙的研究背景10
        1.1.2 混凝土剪力墙的特点10-11
        1.1.3 钢纤维混凝土的特点11
    1.2 研究现状11-14
        1.2.1 钢纤维混凝土剪力墙的研究现状11-12
        1.2.2 有限元分析的研究现状12-14
    1.3 本文的研究内容和意义14-15
2 试验概述15-21
    2.1 试件的设计与制作15-18
    2.2 试验装置和加载方案18-19
        2.2.1 试验装置18
        2.2.2 加载方案18-19
    2.3 材料性质19-21
        2.3.1 钢筋的材料性质19-20
        2.3.2 混凝土的材料性质20-21
3 非线性有限元分析方法21-30
    3.1 ANSYS非线性分析21-23
        3.1.1 单元类型的选取21-22
        3.1.2 实常数的确定22-23
        3.1.3 裂缝的处理23
    3.2 混凝土的弹塑性关系23-25
        3.2.1 屈服准则23-24
        3.2.2 流动法则24
        3.2.3 强化准则24
        3.2.4 破坏准则24-25
    3.3 收敛控制25-26
        3.3.1 影响收敛的因素25
        3.3.2 收敛准则25-26
    3.4 材料的本构模型26-28
        3.4.1 钢纤维混凝土的本构关系26-27
        3.4.2 钢筋的应力应变关系27-28
    3.5 剪力墙有限元模型的建立28-30
        3.5.1 剪力墙有限元模型的建立28
        3.5.2 边界条件和求解28-30
4 有限元分析结果和试验结果的对比30-57
    4.1 高剪力墙的结果对比30-45
        4.1.1 高剪力墙的变形图和位移云图30-32
        4.1.2 高剪力墙的应变云图32-35
        4.1.3 高剪力墙的滞回曲线的对比35-39
        4.1.4 高剪力墙的骨架曲线的对比39-42
        4.1.5 高剪力墙的延性性能的分析42-45
    4.2 低剪力墙的结果对比45-57
        4.2.1 低剪力墙的变形图45-48
        4.2.2 低剪力墙的位移云图48-50
        4.2.3 低剪力墙的应变云图50-53
        4.2.4 低剪力墙的荷载的对比53-54
        4.2.5 低剪力墙的延性系数的对比54-57
5 钢纤维混凝土剪力墙的影响因素57-65
    5.1 高宽比对钢纤维混凝土剪力墙性能的影响57-59
        5.1.1 高宽比对钢纤维混凝土剪力墙的承载力的影响57-58
        5.1.2 高宽比对钢纤维混凝土剪力墙的延性性能的影响58-59
    5.2 钢纤维混凝土强度对钢纤维混凝土剪力墙性能的影响59-62
        5.2.1 钢纤维混凝土强度对钢纤维混凝土剪力墙承载力的影响59-60
        5.2.2 钢纤维混凝土强度对钢纤维混凝土剪力墙延性性能的影响60-62
    5.3 钢纤维体积率对钢纤维混凝土剪力墙性能的影响62-65
        5.3.1 钢纤维体积率对钢纤维混凝土剪力墙的承载力的影响62-63
        5.3.2 钢纤维体积率对钢纤维混凝土剪力墙的延性性能的影响63-65
6 结论和展望65-67
    6.1 结论65
    6.2 展望65-67
参考文献67-70
致谢70
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