考虑楼板面内变形的框—剪结构受力特性分析

发布时间：2018-06-28 12:37

本文选题：楼板面内变形 + 框-剪结构　；参考：《华中科技大学》2013年硕士论文

【摘要】：在一般的结构分析与设计中，设计者通常把楼板当作自身平面内刚度无限大而不计其面外刚度的构件来参与结构的计算，这样可以减少方程中需要求解的未知数的量，从而大大简化模型的计算。但是随着结构平面形式的复杂化、多样化，楼面大开洞或平面的不规则性使得楼板平面内产生变形，而不能满足刚度无限大的假定，若仍采用刚性楼板假定，计算结果的真实性和可靠性就无法得到保证。因此，对于由框架和剪力墙两种刚度差别较大的竖向构件组成的框-剪结构体系，更不能忽略楼板变形对于其受力特性的影响。本文结合两个框-剪结构工程实例，采用ETABS程序分别建立两种模型：一种为刚性楼板假定模型，假定楼板面内无限刚；另一种为弹性楼板模型，考虑楼板面内变形。对每种模型进行振型分析和反应谱分析，，研究不同楼板假定对结构的动力特性、位移特性、内力变化的影响，得出楼板变形对框-剪结构受力特性的影响规律。研究结果表明：相较于楼板刚性假定，弹性楼板假定下结构的整体刚度偏柔，结构周期增大，结构高阶振型的质量参与系数占有不可忽略的比例；弹性楼板假定下结构的侧移和层间位移角均比刚性假定下的大，同一楼层处框架柱的侧移变化幅度要大于剪力墙的侧移变化幅度；弹性楼板假定下楼面开洞或凹槽处的框架柱剪力可达到刚性假定时的数倍，应力集中现象也比较严重，可见楼板变形对结构受力特性的影响较为明显。
[Abstract]:In general structural analysis and design, the designer usually takes the floor as a member with infinite stiffness in its own plane, regardless of its out-of-plane stiffness, to participate in the calculation of the structure, which can reduce the amount of unknown number that needs to be solved in the equation. Thus the calculation of the model is greatly simplified. However, with the complexity and diversification of the plane form of the structure, the large opening of the floor surface or the irregularity of the plane make the floor plane deform, and can not satisfy the assumption of infinite stiffness, if the rigid floor assumption is still adopted, The authenticity and reliability of the results cannot be guaranteed. Therefore, for the frame-shear structure system which consists of two kinds of vertical members with great stiffness difference, the influence of floor deformation on its mechanical characteristics can not be ignored. Based on two examples of frame-shear structure engineering, two models are established by using ETABS program: one is assumed rigid floor model, the other is elastic slab model, which takes into account the deformation of floor surface. The effects of different floor assumptions on the dynamic characteristics, displacement characteristics and internal forces of the structure are studied by means of modal analysis and response spectrum analysis for each model, and the influence of floor deformation on the mechanical properties of frame-shear structures is obtained. The results show that compared with the assumption of floor rigidity, the overall stiffness of the structure is flexible, the period of the structure increases, and the mass participation coefficient of the high-order modes of the structure occupies a proportion that can not be ignored. The lateral displacement and the interstory displacement angle of the structure under the elastic floor assumption are larger than those under the rigid assumption, and the range of the lateral displacement of the frame column at the same floor is larger than that of the shear wall. Under the elastic floor assumption, the shear force of the frame column at the opening or grooving of the floor can be several times as high as that of the rigid assumption, and the stress concentration phenomenon is more serious, so the influence of the floor deformation on the stress characteristics of the structure is obvious.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.2

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