【作者】 赵明；

【导师】 王晖；

【作者基本信息】 天津大学 ， 结构工程， 2007， 硕士

【摘要】 随着城市化的不断推进,异形柱框架结构体系因其良好的建筑使用功能在住宅建设中得到了广泛的应用,但是由于受到轴压比和隔墙厚度的限制,需要加大柱截面的宽度以提高结构的承载能力及抵抗变形的能力。当截面的肢宽与肢厚之比,即肢厚比>4时,超出了规范的界定,即为宽肢异形柱。目前,对于宽肢异形柱构件和结构,国内外研究成果较少,多数研究还处于探索阶段。本文采用ANSYS有限元软件,选取合适的本构关系和数值模型,首先对等肢及不等肢的L形截面柱构件进行弹性有限元分析,根据不同的肢厚比、高宽比等因素下各构件截面的正应变等值线图形变化,分析宽肢异形柱构件变形特性的影响因素,并简要讨论了等肢及不等肢的宽肢异形柱构件的受力变形特性。其次对等肢及不等肢的宽肢L形截面异形柱构件进行非线性有限元分析,根据各异形截面柱的裂缝扩展过程以及破坏前的裂缝分布图形,研究不同尺寸的宽肢异形柱构件的破坏形态。最后对柱肢截面肢厚比为4.5的宽肢L形截面异形柱框架结构进行静力分析,根据结构中的宽肢异形柱的正应变等值线的图形,研究其变形特性,并对整体结构的位移、自振周期、振型等进行了简要分析。研究表明,高宽比是宽肢异形柱构件变形特性的主要影响因素。对于层高为2.8～3.2m的小高层宽肢异性柱结构,其框架柱的变形特性主要以弯剪变形或剪切变形为主。更多还原

【Abstract】 With the development of the urbanization, frame structures with special-shaped columns are used in residential buildings for their advantages. Due to the restriction of axial compression ratio and partition wall thickness, the designers have to enlarge the width of the special-shaped column cross section to improve the structure resistance. It is defined as wide limb special-shaped column when the width-thickness ratio of the cross section exceeds 4, which exceeds the restriction of the Technical Code. There are a few research results at home and abroad with wide limb special-shaped columns and the majority is at the stage of exploration.In this paper, firstly, L-shaped section columns with equiaxial and inequiaxial sections are calculated with elastic finite element method in ANSYS under suitable stress-strain curve and numerical model. According to the normal strain contour lines under the different width-thickness ratio and height-width ratio etc., the influence factors of the deformation feature of wide limb special-shaped columns are studied. The deformation characteristics of the column with equiaxial and inequiaxial sections are compared.Secondly, L-shaped section columns with equiaxial and inequiaxial sections are calculated with nonlinear analysis in ANSYS. The failure feature is discussed on the basis of the crack propagation and distribution.Finally, a frame structure with L-shaped width limb columns, which width-thickness ratio is 4.5, is calculated. The deformation feature is studied according to the normal strain contour lines of columns in the structure. The deformation, natural vibration period and modal of the structure are also discussed.The results show that the height-width ratio is the main effect factor on the deformation feature of wide limb special-shaped columns. It can be deduced that the deformation feature of the multi-story build, which the height of floor is 2.8～3.2 meter, is mainly bending-shear or shear deformation.更多还原