钢管混凝土框架柱计算长度研究

发布时间：2018-09-18 09:20

【摘要】：钢管混凝土结构具有良好的力学性能和施工性能，在国内外高层、超高层建筑及大跨度拱桥中得到了广泛的应用。我国现行的钢管混凝土结构设计规程中规定对于计算长度取值参照钢结构设计规范。因此，给出一个简单、实用、合理的钢管混凝土设计方法，是工程实践中亟待解决的问题。基于以上原因，，本文分别采用解析法和有限元分析法对钢管混凝土框架柱的计算长度进行了分析研究，具体工作如下： (1)引入钢管混凝土柱组合刚度计算公式，并给出了推导钢管混凝土框架柱计算长度系数公式的基本假定，参考钢框架计算长度系数公式推导思路，采用三柱子框架模型，分别推导了有侧移和无侧移钢管混凝土框架柱计算长度系数方程式。 (2)利用ABAQUS有限元软件，建立了钢管混凝土框架模型，并进行了模型验证。在此基础上，选取有侧移和无侧移钢管混凝土框架的有限元简化分析模型，并对其进行非线性屈曲分析，得到简化模型的屈曲临界荷载，带入欧拉公式反算出柱计算长度系数。改变模型的梁截面及跨度，建立不同梁柱线刚度比的钢管混凝土框架简化模型，并进行非线性屈曲分析，得到钢管混凝土框架柱计算长度系数表。对表格中数据进行回归分析，得出有侧移和无侧移钢管混凝土框架柱计算公式。 (3)通过对不同层数、跨数的钢管混凝土框架的线性和非线性屈曲分析，分析了层数和跨数对钢管混凝土框架柱计算长系数的影响。建立不同梁柱节点连接刚度的钢管混凝土框架简化模型，并进行线性和非线性屈曲分析，得到了梁柱半刚性连接对钢管混凝土框架柱的影响规律。
[Abstract]:Concrete-filled steel tubular (CFST) structures have been widely used in high-rise, super-high-rise buildings and long-span arch bridges because of their good mechanical properties and construction properties. The code for the design of concrete filled steel tubular structures (CFST) refers to the design code for the calculated length of concrete filled steel tube (CFST) structures. Therefore, to give a simple, practical and reasonable design method of concrete filled steel tube is an urgent problem to be solved in engineering practice. Based on the above reasons, the computational length of concrete-filled steel tubular columns is analyzed by analytical method and finite element analysis method. The main work is as follows: (1) the formula of composite stiffness of concrete-filled steel tubular columns is introduced. The basic assumption of calculating length coefficient formula of concrete-filled steel tubular frame column is given, and the three column frame model is adopted to deduce the formula of calculating length coefficient of steel frame with reference to the calculation length coefficient formula of steel frame. The length coefficient equations of CFST frame columns with and without lateral displacement are derived respectively. (2) the CFST frame model is established and verified by using ABAQUS finite element software. On this basis, the finite element simplified analysis model of CFST frame with and without lateral displacement is selected, and the nonlinear buckling analysis is carried out, and the critical buckling load of the simplified model is obtained, and the calculated length coefficient of column is back calculated with Euler formula. By changing the beam section and span of the model, a simplified model of concrete-filled steel tubular frame with different Liang Zhu's linear stiffness ratio was established, and the nonlinear buckling analysis was carried out to obtain the calculated length coefficient table of concrete filled steel tubular frame columns. By regression analysis of the data in the table, the formulas for calculating CFST frame columns with and without lateral displacement are obtained. (3) the linear and nonlinear buckling analysis of CFST frames with different layers and spans is carried out. The influence of story number and span number on the calculation length coefficient of CFST frame column is analyzed. The simplified model of concrete-filled steel tubular frame with different joint stiffness of Liang Zhu was established, and the linear and nonlinear buckling analysis was carried out, and the influence of semi-rigid join on concrete filled steel tubular frame column was obtained.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TU398.9

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