导　　师： 张其林

学科专业： 081402

授予学位： 博士

作　　者： ;

机构地区： 同济大学

摘　　要： 传统的轻型钢结构设计,压型钢板仅仅作为屋面、墙面等围护结构,如果将压型钢板与结构构件进行可靠的连接,作为围护结构同时可成为受力结构的组成部分,参与结构体系的共同工作,增加结构的整体刚度。蒙皮效应是指在建筑物表面覆盖屋面和墙面利用本身的刚度和强度对建筑物整体刚度加强作用。考虑了蒙皮效应的轻钢结构的设计不仅使结构的受力更加符合实际情况,还可以获得相当的经济效应。因此,开展轻钢结构蒙皮效应的系统研究,具有十分重要的理论和工程应用价值。 本文首先对自攻螺丝连接的小试件拉伸试验进行了研究。针对国内工程上常用的连接件,对自攻螺钉连接的小试件进行了拉伸试验,研究了不同厚度板连接件的抗剪性能,同时为蒙皮单元的有限元分析提供输入参数依据。 论文结合蒙皮单元的在实际工程的做法,对常用的国产压型钢板采用自攻螺丝连接的受力蒙皮进行了试验研究。研究了蒙皮单元的抗剪强度和抗剪刚度等抗剪性能;研究了连接件布置方式、板型、檩条间距等因素对蒙皮单元抗剪性能的影响。 在试验研究的基础上,采用数值模拟方法研究了蒙皮单元的剪切性能。借助有限元这有力工具,对蒙皮单元剪切试验的结果进行了评价,验证了试验结果的可靠性,同时校验了有限元分析模型;对蒙皮单元在平面内荷载作用下的工作性能以及各种因素对其抗剪性能的影响、破坏形式和机理进行进一步研究,从而更加深入地分析蒙皮单元的破坏机理,研究了蒙皮单元的不同连接边界条件对剪切性能的影响。 本文根据蒙皮单元的试验和有限元分析的结论,参考国外研究成果的基础上,通过合理的力学假设,探讨并推导了采用自攻螺钉连接的受力蒙皮单元抗剪强度和刚度的简化计算公式;通过试验算例进行了有限元计算结果、试验结果以及简化计算结果的比较分析,相互验证结果的合理性;简化计算公式可以为我国正在编制的受力蒙皮设计规程提供理论参考依据。 本文研究了受力蒙皮单元参与整体结构体系的共同作用,从整体上分析了压型钢板的蒙皮效应对整体结构的刚度贡献。针对单层轻钢厂房结构,考虑蒙皮效应后结构的力学性能变化,对其传力途径、内力分布及整体性能方面进行 Currently in the designing of light steel structures, profile sheets are still used as sheathing of the building. However, if proper connections are made between the profiled steel sheets and members, the sheets can resist shear force in their own plane and can be work together with the structures, which not only increase the whole rigidity of structure, but also as an important part of main body. This kind of behavior of profile sheets is named the stressed skin diaphragm. Considering its influence on the performance of the structure as a whole reflect the working of structure really and has considerable economic advantage as well. As such it is significant and practical to develop systemic investigation on the stressed skin diaphragm in the light-gauge steel structures.At first part, joint test program was conducted for the fastener made of self-tapping screw in this paper. Shear behavior of fasteners that connect various thickness sheets was discussed;at the same time, test results can be use to characterize the properties analyzing basic shear panel by finite element.In this paper whole test programs on the shear behavior of basic panel using profiled sheets connected by the self-tapping screws are carried out in this paper, which are constructed according to the detailing in practical engineering. The effects on the shear behavior of the basic panel such as sheeting section, arrangement of fasteners and puriines are studied by analyzing failure modes and shear capacities of the panel.Based on test, numerical modeling method is adopted to simulate the shear behavior of the basic panel. Test results are validated by the powerful finite element method, which themselves verify the reliability of the numerical simulations. Working behaviors of the panel under shear loads in-plane and various factors that affect its shear capacity, failure modes and mechanism are studied. Effects on the shear capacities of the panels considering various connective boundaries are also discussed in this paper. According to reasonable assumptions, this paper derives the simplified design formulas calculating strength and stiffness of shear pane, which is based on the results of test and finite element analysis. The simplified formulas are applied to the shear diaphragm using profiled sheets connected by the self-tapping screws. The test data are compared with the results acquired from the formulas and the finite element analysis. The simplified formulas can be used as a theoretical basis for specification for design of cold-formed steel diaphragm being compiled in our country.Interaction of stressed skin diaphragm and structure as a whole is studied in the last section of the paper. Based on the light-weight building with gable frames, effect of diaphragm that contributes the stiffness of main structure is also discussed. In order to quantify this effect, parameters which influence on performance of the structure as a whole are investigated, such as shear stiffeness, length and gradient of roof sheeting and shear stiffeness of gable;Recommendations for design of light gauge steel diaphragm in the practical engineering are proposed.

关 键 词： 围护结构 蒙皮效应 有限元分析 共同工作 刚度贡献

分 类 号： [TU392.5]

领　　域： [建筑科学]