【作者】 鲍文可；

【导师】 谷倩；

【作者基本信息】 武汉理工大学 ， 结构工程， 2008， 硕士

【摘要】 冷弯薄壁型钢结构体系具有轻质、节材、节能、设计周期短、建筑耐久性好、环保、易于工业化生产等优点,在低层住宅建筑中体现出一系列优势。这种结构体系在国外低层建筑业中已被广泛采用,近年来在我国也开始推广使用,国内企业目前大多引进欧美成套设备、技术、建筑材料生产线和设计软件进行生产和设计。由于国外在冷弯薄壁型钢结构的设计方法及工程应用等方面与我国存在较大差异,我国相关设计规范和规程尚未满足这类结构的设计和施工需要,所以对这种结构的受力性能进行研究显得非常必要。本文以武汉市迈特建筑科技有限公司低层高强冷弯薄壁型钢结构住宅项目为工程背景,以住宅建筑的主要抗侧力体系—墙架结构为研究对象,对高强冷弯薄壁型钢墙架的受剪性能及极限承载力进行分析。本文完成的主要工作包括:(1)采用ANSYS有限单元法对高强冷弯薄壁型钢独立墙架结构的受剪性能进行研究,同时考虑材料非线性和几何非线性,对结构进行模态分析、特征值屈曲分析及非线性屈曲分析。基于有限元计算结果,分析独立墙架的破坏形态、变形特点和极限承载力等。(2)基于独立墙架的有限元模型,进行影响墙架结构受剪性能参数分析,分析的影响因素主要包括:墙架柱间距、墙架高度和自攻螺栓间距。采用有限单元法进行独立墙架结构的屈曲分析,同原结构进行对比,分析上述各项因素对墙架结构受剪承载力的影响。分析结果表明:随着墙架柱间距、墙架高度、自攻螺栓间距的增加,独立墙架结构的受剪承载力降低。(3)结合工程实际,研究组合墙架结构的受剪性能。比较组合墙架结构与独立墙架结构在稳定性、主要破坏形态及极限屈曲荷载等方面的联系与差异。分析结果表明,组合墙架随着墙架个数的增加,其受剪承载力也相应增加,充分体现了墙架结构整体性对墙架结构的影响。(4)对冷弯薄壁型钢结构组合墙体“蒙皮效应”进行探讨,分析“蒙皮效应”的主要设计方法、设计假定、构造条件、有限元模型建立原理及破坏形态等,分析“蒙皮效应”对冷弯薄壁型钢结构组合墙体受剪性能的影响。最后,本文对以上工作进行了总结,得出一些有益的结论,并提出有待进一步研究的问题。更多还原

【Abstract】 The cold-formed thin-wall steel structural system behaves a series of advantages for the low-rise residential buildings, including light weight, material saving, short design and construction duration, energy saving, environmental protection, easy industrialized production and etc. This structural system is widely used abroad many years but used in China in recent years. Domestic enterprises are mostly used abroad sets of technologies, skill and building materials production lines. Since there are great differences between abroad and China in the design and its application, so that the research of shear behavior on this structure system is very necessary.In this paper, low-rise cold-formed thin-wall steel structural system of Met Frame Construction Technology CO. LTD for engineering background, the wall frame is taken as an object to research of the Anti-force behavior and ultimate bearing capacity. The mainly discusses are followed:(1)The numerical analysis of the high-strength ultra-thin-wall steel independent-wall frame models is performed considering material and geometry nonlinear problems simultaneously. As a result, modal Analysis, failure modes, ultimate bearing capacity of the independent -wall frame are obtained and analyzed.(2)A parametric analysis by FEM is carried out. The influences of different column spaces, different height-width ratios of wall frames and different member connection pitch upon the shear capacity of wall frame are discussed. Furthermore, Compared the ultimate buckling load with original structure, the analysis of the impact of various factors. The results show that: With the column spaces, wall-height, the distance between the member connection pitch to increase, the independent structure of the wall-shear strength reduced. (3)Considering the needs of project, the study by independent-wall frame to wall-wall frame. Comparative Study of stability, failure modes, ultimate buckling load with two structure system .Results from the analysis shows that with the increase of wall frame’s number, the shear capacity of wall frame is significantly increased, and extent of the increase of shear capacity is greatly, The results fully reflects the structural integrity of the wall-effects.(4)To explode and understand the main design method、design assumptions、structural conditions、principle of finite element model and failure modes of "stressed skin diaphragm", and research influence on shear capacity of wall frame.At last, all researches in this article are concluded, some conclusions are very helpful for the future design and some questions need to be solved in future are pointed out.更多还原