【作者】 王海波；

【导师】 沈蒲生；

【作者基本信息】 湖南大学 ， 结构工程， 2004， 博士

【摘要】 超高层钢筋混凝土筒中筒结构是高层建筑结构的发展方向之一,本文着重进行了两个方面的研究:筒中筒结构模型的静力弹性试验及简化分析方法,筒中筒结构模型的拟动力试验及非线性分析方法。具体内容如下: (1) 完成了一个14层1/10缩尺的钢筋混凝土筒中筒结构模型静力试验,重点分析了偏心水平荷载和顶部竖向荷载对模型受力性能的影响,可供筒中筒结构分析和设计时参考。 (2) 将框筒结构在侧向荷载作用下的楼层变形划分为剪切变形和弯曲变形。将分析平面框架结构的D值法进行简化,并推广应用于框筒结构的整体剪切变形及内力分析,首次考虑了翼缘框架剪切刚度的影响。结构的整体弯曲变形及内力通过3种方法分析:1)以采用等效连续体法对弯曲变形及内力进行分析,分析了影响框筒结构剪力滞的主要因素;2) 提出了假定轴向位移模式的简化方法,考虑了正剪力滞的影响,分析了影响结构位移的因素;3) 提出了框筒结构各层同时存在正剪力滞和负剪力滞的简化假定,并假设了框筒各柱的轴向应变分布模式,对负剪力滞的影响因素进行了分析。通过与空间框架分析程序的比较表明,本文方法简单,实用,可直接进行手算,因而可供初步设计阶段使用。 (3) 采用层模型对在水平荷载作用下的筒中筒结构进行了简化分析,通过与筒中筒结构模型静力试验对比,表明本文所提出的层模型是合理的;在分析了外框筒底层平面外抗扭刚度参与系数的影响因素及大小的前提下,提出扭转荷载作用下筒中筒结构简化层模型,通过与偏心荷载作用下的筒中筒结构模型试验结果进行对比,表明了本文的扭转层模型思路简单,其计算结果可满足实际工程需要。 (4) 将筒中筒结构模型等效为两自由度体系,完成了6种工况的地震波加速度峰值的拟动力试验,研究了筒中筒结构在地震作用下的动力特性、弹性和弹塑性阶段的地震反应、抗震性能和破坏机理。 (5) 以筒中筒模型试验现象和破坏机理为基础,建立了裙深梁、剪力墙、矩形截面柱、L形截面柱的非线性分析单元模型。通过算例分析并与试验结果比较,表明本文模型具有较好的计算精度。 (6) 提出并推导了钢筋混凝土梁剪压区剪切模量的简化折减系数,提出了非线性剪切变形的简化计算方法,采用三分段杆单元模型可对钢筋混凝土简体结构裙深梁进行非线性分析。 (7) 对目前多垂直杆单元模型考虑剪切变形的三种方法进行了探讨和对比,提出了一种更为合理的刚度矩阵形式,也提出了考虑刚度下降段的简化方法,结合钢筋混凝土拉压滞变模型和剪切滞变模型,可对剪力墙结构进行非线性分析。 (8) 在指出现有多弹簧模型存在问题的前提下,结合现有分析剪力墙的多垂直杆更多还原

【Abstract】 Reinforced concrete tube in tube structure is a developing structure system of high-rise building. Two aspects are focused on: the test model study on static elastic property and simple analysis method for RC tube in tube structure, the pseudo-dynamic model test study and nonlinear analysis method for RC tube in tube structure.(1) The static elastic test of a 14 stories 1/10 scale reinforced concrete tube in tube structure model is accomplished. The influence of eccentric lateral load and top vertical load on property of structure model is emphatically studied, possessing certain reference value to analysis and design for tube in tube structure.(2) In this thesis, the storey deformations of frame-tube structures under lateral loads are divided into shear deformations and flexural deformations. The shear deformations and forces can be calculated by the simplified amendatory contraflexure point method, in which the shear stiffness of flange panels is taken into account for the first time. The flexural deformations and forces can be calculated by three methods. Firstly, the equivalent continuous system method can be used, in which the main influencing parameters of shear lag are discussed. Secondly, the flexural deformations and forces can be obtained by a simple method of assumed distributions of axial displacements, in which positive shear lag effects is included and influencing factors of displacement are discussed. Thirdly, a simple assumption is put forward that positive and negative shear lag are all exist in each storey of frame-tube structures under lateral loads. The assumed distributions of axial strains are given in the web and flange panels, in which the influencing factors of negative shear lag are discussed. Contrasting with space-frame analysis programs, the accuracy of the proposed methods is demonstrated through the analysis of framed-tube structures. The three methods are simple hand-calculation method and can be used for preliminary design.(3) The simple storey model analysis method is adopted to calculate tube in tube structure under lateral loads. Contrasting with the static test results shows that the presented method is reasonable. On the promise of analyzing the attached coefficient of out plane torsional stiffness for the bottom story of frame tube structure, the simple storey model method is put forward to analyze the tube in tube structure under torsional loads. the simplicity and accuracy of the proposed method is demonstrated through the analysis of the tube in tube structure under eccentric lateral loads.(4) The tube in tube structure model is equivalent as two degree of freedom system,更多还原