【作者】 苗雨；

【导师】 武胜；

【作者基本信息】 东北林业大学 ， 结构工程， 2014， 硕士

【摘要】 高强冷弯型钢构件具有强度高、截面板件薄等特点,近年来,在发达国家的低层冷弯薄壁型钢住宅和门式刚架体系中已经开始广泛使用屈服强度达到550MPa的冷弯薄壁型钢构件,并取得了一定的工程经验,而我国在这方面才刚起步。我国的现行标准《冷弯薄壁型钢结构技术规范》(GB50018-2002)的编制是以Q235和Q345钢材试验研究为基础的,还没有对高强冷弯薄壁型钢设计的相应规定,因此,对高强冷弯薄壁型钢构件的研究显得尤为重要。本文基于在查阅大量文献的基础上,借助于ANSYS有限元分析软件,对高强冷弯薄壁型钢两种不同箱形加工截面形式的组合轴压构件的屈曲性能和承载力进行了材料非线性和几何非线性数值模拟分析,以及利用CUFSM有限条程序和直接强度法进行比较分析,具体包括以下内容：(1)考虑几何缺陷的大小,建立材料的本构关系,先对高强冷弯薄壁型钢箱形组合轴压标准构件进行有限元分析。(2)本文在ANSYS有限元分析中着重研究在不同的翼缘宽厚比b/t、腹板高厚比h/t、加劲间隔比g/h、加劲高度比hw/bw以及构件长度下对高强冷弯薄壁型钢箱形组合钢轴压构件的极限承载力及屈曲模式的影响。(3)利用CUFSM有限条软件针对两种新型箱形截面轴压柱进行变参数分析,并将分析结果与有限元进行比较。(4)在CUFSM数值分析的基础上,利用直接强度法设计公式计算两种高强冷弯薄壁型钢箱形组合轴压柱的极限承载力,并将计算结果与ANSYS有限元分析结果进行对比分析。更多还原

【Abstract】 High strength cold-formed steel components have high strength, thin-section panels and other characteristics, in recent years, low-rise residential and cold-formed steel portal frame system developed countries have begun to yield strength of550MPa widespread use of cold-formed steel members, and achieved a certain degree of engineering experience, but our in this respect has just started. The current standard of’cold-formed steel structure technical specifications"(GB50018-2002)is based on test preparation Q235and Q345steel research-based, no corresponding provision of high-strength cold-formed steel design, therefore, the high-strength cold-formed steel members research is particularly important.In this paper, based on a lot of references, with the help of ANSYS finite element analysis software, buckling strength and bearing capacity of two different high-strength cold-formed steel box-shaped cross-section in the form of processed portfolio axial compression were material nonlinearity and geometric nonlinear numerical simulation analysis, and the use of CUFSM limited direct strength method of procedure and comparative analysis, specifically including the following:(1) considering the geometric size of the defect, establishing the constitutive relations of materials, first to analyse the high-strength cold-formed steel box-shaped combination of axial compression standard component using finite element analysis.(2) Based on the ANSYS finite element analysis focuses on a different flange thickness ratio b/t, the web thickness ratio h/t, stiffener spacing ratio g/h, stiffening height ratio hw/b and the length of the member under the impact of high-strength cold-formed steel thin-walled steel box-shaped combination of ultimate bearing capacity of axial compression and buckling modes.(3) using the CUFSM finite software for the parametric analysis of two new kinds of box section column axial load, and the results are compared with finite element method.(4) based on CUFSM numerical analysis, calculation of two kinds of high strength cold-formed steel box composite axial compressive ultimate bearing capacity of column using direct strength method of design formula, and compare the results with the ANSYS finite element analysis results.更多还原