梁柱弱轴连接钢框架结构力学性能研究

发布时间：2018-07-24 09:39

【摘要】：近几个世纪以来,钢结构发展迅速,钢结构的研究越来越重要。目前,梁柱强轴连接节点的力学性能的相关研究较多,但梁柱弱轴连接节点的力学性能的相关研究较少。为了探究梁柱弱轴连接节点的力学性能,研究了一种梁柱弱轴连接全焊型节点,并研究了梁柱弱轴连接钢框架结构的力学性能,具体工作如下： 1.利用虚位移原理和弹性力学方法推导了梁柱弱轴连接节点初始转动刚度的计算公式,分析了梁柱弱轴连接节点的各参数变化对节点性能的影响。结果表明柱子的截面惯性矩和层高(即柱高)对钢框架梁柱弱轴连接节点的初始转动刚度有很大的影响； 2.采用有限元方法分析了梁柱弱轴连接节点的力学性能。将理论分析得到的结果与有限元结果进行了比较。理论推导得出的公式与有限元分析方法结果吻合良好,误差不超过15%,该理论公式可以在实际工程计算中作参考； 3.提出了在平面钢框架中分析梁柱弱轴连接节点力学性能影响的方法,且该分析方法考虑了二阶效应。接着又提出了分析结构整体初始几何缺陷的方法,形成了一套考虑结构整体初始几何缺陷的半刚性钢框架的二阶弹性的方法体系。采用FORTRAN程序将上述方法体系编成了SEASF程序； 4.将该程序应用于实际工程案例,研究了结构整体初始几何缺陷对框架结构力学性能的影响,结果表明,结构整体初始几何缺陷对结构力学性能的影响较大,在相同高度条件下,随着跨数的增加,这种影响也随之增加。研究了梁柱弱轴连接节点力学性能对钢框架结构力学性能的影响,结果表明,梁柱弱轴连接节点力学性能对框架结构力学性能的影响较大,该影响的程度与框架跨数联系不大。如果不考虑梁柱弱轴连接节点的力学性能,结构的计算侧移值将会小于结构的真实侧移值,给结构带来安全隐患。也研究了梁柱弱轴连接节点力学性能对钢框架支撑结构力学性能的影响,结果表明,梁柱弱轴连接钢框架支撑结构的抗侧移刚度远大于梁柱弱轴连接纯钢框架结构的抗侧移刚度。梁柱弱轴连接节点的力学性能对钢框架支撑结构力学性能的影响较小。
[Abstract]:With the rapid development of steel structures in recent centuries, the research of steel structures is becoming more and more important. At present, there are many researches on the mechanical properties of Liang Zhu strong axis connections, but few on the mechanical properties of Liang Zhu weak axis connections. In order to investigate the mechanical properties of Liang Zhu weak axis joint, a kind of Liang Zhu weak shaft connection all-welded joint is studied, and the mechanical properties of Liang Zhu weak axis connection steel frame structure are studied. The main works are as follows: 1. Based on the principle of virtual displacement and the method of elasticity, the calculation formula of initial rotational stiffness of Liang Zhu weak axis connection joint is derived, and the influence of various parameters of Liang Zhu weak axis connection joint on the joint performance is analyzed. The results show that the moment of inertia and the height of the column (i.e. the height of the column) have great influence on the initial rotational stiffness of the steel frame Liang Zhu weakly connected joints. 2. The finite element method is used to analyze the mechanical properties of Liang Zhu weakly connected joints. The results obtained by theoretical analysis are compared with those obtained by finite element method. The theoretical formula is in good agreement with the finite element analysis method, and the error is not more than 15. The theoretical formula can be used as a reference in practical engineering calculation. A method for analyzing the influence of mechanical properties of Liang Zhu weak shaft joints in plane steel frame is proposed, and the second order effect is considered in the analysis method. Then, a method for analyzing the initial geometric defects of the whole structure is proposed, and a second order elastic method system of semi-rigid steel frame considering the initial geometric defects of the whole structure is formed. The above method system is programmed into SEASF program by FORTRAN program. 4. The program is applied to practical engineering cases to study the effect of the initial geometric defects of the whole structure on the mechanical properties of the frame structure. The results show that the initial geometric defects of the whole structure have a great effect on the mechanical properties of the structure, and under the same height conditions, As the number of spans increases, so does the effect. The effect of mechanical properties of Liang Zhu weak axis connection joints on the mechanical properties of steel frame structures is studied. The results show that the mechanical properties of Liang Zhu weak axis connections have great influence on the mechanical properties of frame structures, and the degree of influence is not related to the span number of frames. If the mechanical properties of Liang Zhu weak axis connections are not considered, the calculated lateral displacement of the structure will be smaller than the true lateral displacement of the structure, which will bring about a hidden danger to the safety of the structure. The effects of mechanical properties of Liang Zhu weak shaft connection joints on the mechanical properties of steel frame bracing structures are also studied. The results show that, The anti-lateral stiffness of steel frame bracing structure with Liang Zhu weak shaft connection is much higher than that of pure steel frame structure with Liang Zhu weak axis connection. The mechanical properties of Liang Zhu weakly connected joints have little effect on the mechanical properties of steel frame bracing structures.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU391;TU311

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