【作者】 孟庆铜；

【导师】 杨娜；

【作者基本信息】 北京交通大学 ， 结构工程， 2009， 硕士

【摘要】 冷弯薄壁型钢构件可以加工成多种经济截面形式,受力性能较好,承载力较高,整体刚度较大,而且易于加工、制作简单,运输、安装方便,易于工业化,在轻钢龙骨住宅等结构中大量应用。但是目前冷弯薄壁型钢构件的研究还集中在静力研究,对此类构件在循环荷载下的滞回性能和抗震能力研究还很少,对冷弯薄壁型钢构件进行抗震性能进行研究具有重要的工程意义。首先,基于稳定理论和双重非线性有限元方法,以ANSYS软件为工作平台,本文采用Shell 181板壳单元建立了冷弯薄壁型钢构件的有限元分析模型,该模型可以方便考虑初始缺陷和残余应力的影响。其次,本文对轴压和剪切荷载作用下的冷弯薄壁型钢构件进行了全过程的参数分析。根据计算获得的荷载位移曲线、弹性承载力、极限承载力、构件变形、塑性发展等,分析了腹板宽厚比、翼缘宽厚比、长细比等参数对其稳定性能的影响。第三,本文讨论了循环荷载作用下冷弯薄壁型钢构件的稳定性能。从滞回曲线、局部屈曲、耗能、骨架曲线、位移延性系数、极限承载力等角度,对比分析了初始缺陷、残余应力、腹板宽厚比、翼缘宽厚比、长细比、轴压比等对构件的循环稳定性能的影响。最后,本文完成了6个冷弯薄壁矩形截面构件的滞回性能试验和4个冷弯薄壁矩形截面构件的静力试验。从破坏现象、滞回曲线、局部屈曲、耗能、骨架曲线、位移延性系数、极限承载力等角度,对比分析了轴力、腹板宽厚比、翼缘宽厚比、楔率、初始缺陷等因素对其稳定性能的影响；通过对试验试件破坏机理的分析,获得了对此类构件的工程设计富有意义的结论和建议。更多还原

【Abstract】 All kinds of economical cross-section configurations of the cold-formed thin-wall steel(CFS) members can be produced by cold-forming operations,and consequently favorable section shape can be obtained.Besides,CFS members can be prone to process,transport,install and industialize.At present,CFS members have been widely utilized as principle structural members in low-rise light-gauge steel framed residences.However,research on CFS members is mainly focused on the range of static performacnce,and the hysteretic behavior of CFS members has not been researched deeply. To explore the feasibility of light-gauge steel framed residences in seismic fortified areas, the researches for the hysteretic behavior of CFS members has great technical and economic significance.Above all, based on stability theory and nonlinear finite element (FE) method, ANSYS finite element models (FEM) are presented, which introduce shell 181 and take geometric and material nonlinear into account. In the process of FE analysis, influence of initial imperfection can be conveniently considered.Secondly, Interactive buckling whole process parameter analysis of CFS members under axial compressure or shear load has been performed. According to load-displacement curves, elastic load-carrying capacity, ultimate load-carrying capacity, the deformation of members, the development of plasticity etc. calculated by ANSYS, influence of some parameters like web slenderness ration, flange slenderness ratio, member slenderness ratio on the buckling behaviors of members has been analyzed under axial compressure or shear load.Thirdly, the buckling behaviors of CFS members under cyclic loading are analyzed mainly. Testing phenomenon, hysteresis loop, local buckling, energy dissipation, skeleton curve, displacement ductility coefficient, ultimate load-carrying capacity are focused on. According to the test results, influence of some parameters like pressure, web and flange slenderness ratio and initial imperfection etc. on the buckling behaviors of members has been analyzed. Considering combined stable load-carrying capacity and ductility, the limit of web width-to-thickness ratio has presented.In the end, six specimens of CFS rectangle-section steel columns have been tested under cyclic loading, four specimens of CFS rectangle-section steel columns have been tested under monotonic static loading, in which, testing phenomenon, hysteresis loop, local buckling, energy dissipation, skeleton curve, displacement ductility coefficient, ultimate load-carrying capacity are focused on. According to the test results, influence of some parameters like pressure, web and flange slenderness ratio, web tapering ratio and initial imperfection etc. on the buckling behaviors of members has been analyzed. Failure mechanism has been analyzed. Some conclusions and suggestions are given.更多还原