【作者】 李政；

【导师】 金声；

【作者基本信息】 重庆大学 ， 工程（建筑与土木工程）（专业学位）， 2022， 硕士

【摘要】 近年来,轻钢结构建筑体系在国内取得了较大发展,在该类建筑中,除定向刨花板(OSB板)、石膏板、胶合板等常用覆面板材外,稻草板因其结构和成型特点带来的生态优势也逐渐走进市场。稻草板具有隔音降噪、隔热保温等优点,采用稻草板作为覆面板的轻钢龙骨体系房屋结构不但延续了轻钢结构施工效率高、空间布置灵活、抗震性能优良的优势,还解决了传统轻钢结构体系隔音降噪、保温隔热性能不佳的问题。该新型轻钢龙骨与生物基面板组合墙体具有较好的应用前景。本文通过试验和有限元模拟分析的方法,对轻钢龙骨-稻草板组合墙体的抗震性能进行研究,为后续在工程实际中的应用提供参考依据。主要研究内容如下:(1)对9片足尺轻钢龙骨组合墙体进行水平加载试验,其中包括3片组合墙体的水平单调加载试验和6片组合墙体的水平低周往复加载试验,考察了加载方式、角部覆三角钢板、角部三角钢板尺寸、角部三角钢板加强自攻螺钉连接等构造和参数对双面覆稻草板组合墙体抗震性能的影响,并与双面覆OSB板组合墙体的抗震性能进行了对比。根据对比试验研究,得到了荷载-位移曲线,归纳了不同构造形式墙体的破坏模式,分析了各组墙体试件抗剪承载力、延性、耗能能力以及刚度和强度退化等抗震性能指标。结果表明,该类墙体主要破坏模式为端立柱受压发生畸变屈曲破坏以及稻草板螺钉孔处撕裂导致的连接破坏,墙体的抗剪承载力在13.99 k N/m～21.19 k N/m之间,延性和耗能能力良好;采用角部覆三角钢板及加强自攻螺钉连接的构造,可有效提高墙体抗剪承载力,并有利于充分发挥稻草板的耗能能力。同时对自攻螺钉连接件进行了抗剪连接试验,分析了不同自攻螺钉连接件的力学性能。(2)采用ABAQUS软件开展了轻钢龙骨-稻草板组合墙体的有限元模拟研究。选用串联连接单元、耦合节点自由度等方法模拟自攻螺钉连接。与试验结果的对比表明,通过对接触和边界条件的准确设置,及墙体中不同构件间自攻螺钉连接的合理参数设置,可实现对轻钢龙骨-稻草板组合墙体荷载-位移曲线、承载力、破坏特征及滞回曲线捏缩滑移特征的良好拟合。研究结果可用于该类墙体的有限元参数分析。(3)根据试验结果,提出轻钢龙骨-稻草板组合墙体设计建议,并基于我国《低层冷弯薄壁型钢房屋技术规程》(JGJ227-2011)和美国AISI S400-15规范的规定,对轻钢龙骨-稻草板组合墙体的抗力分项系数进行了推导,并计算了试验组合墙体在水平地震作用下的抗剪承载力设计值,为工程设计应用提供了参考。更多还原

【Abstract】 In recent years,the light steel structure building system has achieved great development in China.In this type of building,in addition to the commonly used cladding panels such as oriented strand board(OSB board),gypsum board,plywood,etc,straw board has gradually entered the market due to its structure and forming characteristics of ecological advantages.The straw board has the advantages of sound insulation,noise reduction,heat insulation,etc.The light steel keel system house structure using the straw board as the cladding panel not only continues the advantages of high construction efficiency,flexible space layout,and excellent seismic performance of the light steel structure,but also solves the problems of sound insulation and noise reduction,poor heat insulation performance of traditional light steel structure system.The new light steel keel and bio-based panel combined wall has a good application prospect.In this paper,the seismic performance of the light steel keel-straw board composite wall is studied through the methods of experiment and finite element simulation analysis,which provides reference for the subsequent application in engineering practice.The main research contents are as follows:(1)The horizontal loading experiments were carried out on 9 full-length light steel keel composite walls,including the horizontal monotonic loading experiments of 3composite walls and the horizontal low-cycle reciprocating loading experiments of 6composite walls.The influence of the loading method,the corner cladding triangular steel plate,the corner triangular steel plate size,the corner triangular steel plate reinforced selftapping screw connection and other structures and parameters on the seismic performance of the double-sided straw-clad composite wall were investigated,and the seismic performance of the double-sided OSB-clad composite wall was compared.According to the comparative experimental research,the load-displacement curve was obtained,the failure modes of the walls with different structural forms were summarized,and the seismic performance indicators such as shear bearing capacity,ductility,energy dissipation capacity,and stiffness and strength degradation of each group of wall specimens were analyzed.The results show that the main failure mode of this type of wall is the deformation buckling failure of the end column under compression and the connection failure caused by the tearing of the screw hole of the straw board.The shear bearing capacity of the wall is between 13.99 k N /m and 21.19 k N /m.and the ductility and energy dissipation capacity are good;the structure of the corner covered triangular steel plate and the connection of reinforced self-tapping screws can effectively improve the shear bearing capacity of the wall,and is conducive to giving full play to the energy dissipation capacity of the straw board.At the same time,the shear connection test of self-tapping screw connectors was carried out,and the mechanical properties of different self-tapping screw connectors were analyzed.(2)The finite element simulation study of light steel keel-straw board composite wall was carried out by using ABAQUS finite element software.The self-tapping screw connection is simulated by the method of series connection element and nodal degree of freedom coupling.The comparison with the experimental results shows that through the accurate setting of contact and boundary conditions,and the reasonable parameter setting of self-tapping screw connection between different components in the wall,the loaddisplacement curve,bearing capacity,failure characteristics and hysteretic curve of the composite wall of light steel keel-straw board can be well fitted.The results can be used to analyze the finite element parameters of the wall.(3)According to the experimental results,the design proposals of light steel keelstraw board composite wall are put forward.Based on the "Technical Specifications for Low-rise Cold-Formed Thin-walled Steel Buildings"(JGJ227-2011)and the American AISI S400-15 specification,the partial coefficient of resistance of the light steel keelstraw board composite wall is deduced,and the design value of the shear bearing capacity of the test composite wall under horizontal earthquake action is calculated,which provides a reference for engineering design application.更多还原