高层框架核心筒结构不同分析方法的对比研究

发布时间：2018-03-29 04:05

本文选题：框架核心筒结构　切入点：剪力滞后效应　出处：《兰州交通大学》2017年硕士论文

【摘要】：框架核心筒结构是外围由框架结构、中间由筒体构成的高层建筑结构体系,由于其良好的受力特性在高层建筑中得到了广泛的应用。等效连续化法作为一种外框架结构的分析方法,由于能够考虑剪力滞后效应的影响,可以较为准确的分析框架核心筒结构中外框架受水平荷载时的内力与位移。本文以等效连续化理论为基础对外框架结构进行简化,并分别采用力法和微分方程方法对框架核心筒结构进行整体求解,并比较计算结果。最后基于等效连续化法采用ANSYS软件对框架核心筒结构进行简化建模,并与原整体模型结果进行对比分析。论文的具体工作如下:(1)以等效连续化理论为基础,将框架核心筒结构外框架部分等效为正交异性板结构,列出考虑剪力滞效应的外框筒结构单独受三种典型水平荷载作用下的梁柱内力和水平位移计算公式。然后在外框筒结构单独受力下的应力计算公式基础上,分别采用力法和微分方程法列出对框架核心筒整体受力时考虑剪力滞后效应的梁柱内力和水平位移计算公式。(2)采用计算公式对某典型框架核心筒结构进行柱轴力与水平位移的计算,并求出外框架单独受力的结果,以及框架核心筒结构整体受力时采用等效连续体-力法和等效连续体-微分方程法计算的结果,将结果进行比较。利用有限元软件ANSYS对此框架核心筒结构进行建模,将有限元分析结果与基于连续化法的手算结果进行比较分析。(3)通过对连续化法准确性的验证,在等效连续化法的基础上提出一种对高层框架核心筒结构的有限元简化建模方法,即将外框架等效为正交异性板建模,通过定义板厚和异性板材料参数完成外部复杂框架结构的建模,能够大幅减少复杂高层模型的建模时间。对简化建模后的框架核心筒结构模型和整体式建模的模型进行水平静载和动力特性的对比分析,验证简化建模方法的可行性。通过对比分析,本文认为等效连续化手算方法能够模拟高层框架核心筒结构的受力特点有一定准确性,但计算繁琐,实用性不强。初步设计时,可采用本文提出的基于连续化法的简化建模方法对建筑进行初步估算,并为设计最后阶段的整体建模分析提供一种校核措施。
[Abstract]:The frame core tube structure is a tall building structure system with outer frame structure and middle tube body. Because of its good mechanical properties, it has been widely used in high-rise buildings. As an analysis method of external frame structure, the equivalent continuum method can take into account the influence of shear lag effect. The internal force and displacement of the frame core tube structure under horizontal load can be accurately analyzed. This paper simplifies the external frame structure based on the equivalent continuum theory. The force method and differential equation method are used to solve the frame core tube structure as a whole, and the results are compared. Finally, based on the equivalent continuum method, the frame core tube structure is simplified and modeled by ANSYS software. The main work of this paper is as follows: (1) based on the equivalent continuum theory, the outer frame part of the frame core tube structure is equivalent to the orthotropic plate structure. The formulas for calculating the internal force and horizontal displacement of outer frame-tube structure under three typical horizontal loads are presented, which consider the shear lag effect. Then, based on the stress calculation formula of the outer frame-tube structure under separate forces, the formulas for calculating the internal force and the horizontal displacement of the outer frame-tube structure under three typical horizontal loads are presented. The force method and differential equation method are used to list the calculation formulas of Liang Zhu's internal force and horizontal displacement considering the shear lag effect when the frame core tube is subjected to the whole force.) the calculation formula is used to calculate the column axial force of a typical frame core tube structure. And the calculation of horizontal displacement, The results of separate forces acting on the outer frame and the results calculated by the equivalent continuum force method and the equivalent continuum differential equation method when the frame core tube structure is subjected to the whole force are obtained. The results are compared. Finite element software ANSYS is used to model the core tube structure of the frame. The accuracy of the method is verified by comparing the results of finite element analysis with the results of manual calculation based on continuous method. Based on the equivalent continuum method, a simplified finite element modeling method for high-rise frame core tube structure is proposed, which means that the outer frame is equivalent to orthotropic plate. By defining the material parameters of plate thickness and anisotropic plate, the modeling of external complex frame structure is completed. The modeling time of complex high-rise model can be greatly reduced. The comparison analysis of water calm load and dynamic characteristics between the simplified frame core tube structure model and the integral modeling model is carried out. The feasibility of simplified modeling method is verified. Through comparison and analysis, it is concluded that the equivalent continuous manual calculation method can simulate the mechanical characteristics of high-rise frame core tube structure with certain accuracy, but the calculation is cumbersome and practical. The simplified modeling method proposed in this paper can be used to estimate the building and provide a checking measure for the whole modeling analysis in the final stage of design.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973.1

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