木框架剪力墙受力性能研究

发布时间：2018-05-25 22:36

本文选题：木框架剪力墙 + 钉节点　；参考：《南京林业大学》2013年博士论文

【摘要】：2003年我国的《木结构设计规范》(GB5005-2003)中增设了“轻型木结构房屋”的有关条文，但其主要内容大部分来自北美的试验研究成果和规范。轻型木结构房屋在我国尚处于发展阶段，有关轻型木结构方面的研究工作还未系统地展开。木框架剪力墙受力性能的试验研究能为我国轻型木结构房屋的推广和规范的修订提供理论和试验依据。本文进行了木框架剪力墙结构中面板—木框架钉节点以及木框架钉节点的试验研究。为研究不同上部刚度对木框架剪力墙受力性能的影响，单层木剪力墙顶部的荷载传递梁采用三种形式，分别称为铰接钢梁、连续钢梁和新型荷载传递梁。进行了足尺木框架剪力墙的试验研究，，试件分为二组，第一组考虑洞口尺寸、上层刚度、竖向荷载的不同组合，共设计了11组试件。另外一组使用新型新型荷载传递梁，设计了3组试件。每个试件先进行单向荷载试验，在修复木框架以及更换新墙板后再进行反复荷载试验。采用ANSYS有限元软件建立了木框架剪力墙分析模型。实际剪力墙由墙骨柱和墙面板两种材料组成，两者之间通过钉子连接。木剪力墙承载能力和变形能力主要决定于木框架和墙面板之间的钉连接。模型利用了面板-木框架钉节点、木框架钉节点连接试验得出钉节点非线性参数，重点进行了单向荷载作用下木框架剪力墙受力分析。通过以上的试验研究，本文形成了下述的主要结论。在Foschi的指数型钉节点模型基础上，建立了一种适用于中国钉子两个方向面板-木框架钉节点、木框架钉节点的骨架模型，该模型为利用有限元软件分析轻型木框架剪力墙结构提供了基础资料。增加墙上部刚度、施加竖向荷载能够提高木剪力墙的抗剪强度。新型荷载传递梁由于对木剪力墙试件没有约束作用，导致其试件的抗剪强度均小于构造相同的其他试件。木剪力墙破坏时的变形可分为整体变形和局部变形。整体变形主要发生在木框架中，墙骨柱与底梁板发生分离，加大了整个木框架剪力墙的侧向变形；木剪力墙的局部变形主要是由墙面板与木框架之间的钉节点滑移引起的，每一块墙面板绕各自的中心轴转动，墙面板成为倾斜的矩形。采用新型荷载传递梁的木剪力墙试件弹性抗侧刚度要比铰接荷载传递梁和刚性荷载传递梁木剪力墙试件的弹性抗侧刚度要小。采用新型荷载传递梁的木剪力墙试件抗剪强度和极限位移都要小于铰接钢梁和连续钢梁下试件的抗剪强度和极限位移。木剪力墙在单向及反复荷载作用下，在连续刚性荷载传递梁中产生了较大内力，说明上层墙体可以产生相当大的反力来抵消外荷载引起的上拔力。采用ANSYS软件对木框架剪力墙进行有限元分析可以得到在木框架剪力墙的应力分布以及变形情况，可以加深对木结构剪力墙抗侧力性能的理解，并为木框架剪力墙设计提供依据。
[Abstract]:In 2003, the relevant provisions of "light wood structure housing" were added to the code for design of wood structure (GB5005-2003) in China, but the main contents were mostly from the experimental research results and norms in North America. The light wood structure houses are still in the development stage in our country, and the research work on light wood structure has not been systematically carried out. Experimental study on the mechanical behavior of frame shear walls can provide theoretical and experimental basis for the popularization and standardization of light wood frame buildings in China.
In this paper, the experimental study of wood frame stud joints and wood frame stud joints in timber frame shear wall structures is carried out.
In order to study the effect of different upper stiffness on the mechanical properties of wood frame shear walls, three kinds of load transfer beams on the top of single storey shear wall are used, called hinged steel beams, continuous steel beams and new load transfer beams.
The test research of the foot wall frame shear wall is carried out. The test parts are divided into two groups. The first group considers the size of the hole, the upper stiffness and the vertical load, and a total of 11 sets of specimens are designed. The other group uses a new type of new load transfer beam to design 3 sets of specimens. After the new wallboard, repeated load tests are carried out.
The analysis model of wood frame shear wall is established by using ANSYS finite element software. The actual shear wall consists of two kinds of wall bone column and wall panel, which are connected through a nail. The bearing capacity and deformation ability of the wood shear wall are mainly determined by the nail connection between the wood frame and the wall panel. The nonlinear parameters of nail joints are obtained through the experiment of nail joint connection, and the stress analysis of wood frame shear walls under uniaxial loading is mainly carried out.
Through the above experimental research, the following conclusions are formed.
On the basis of the exponential nailed node model of Foschi, a skeleton model for wood frame nailed joints in two directions of Chinese nails is established. The model provides the basic data for the analysis of light wood frame shear wall structure by using the finite element software.
The shear strength of the shear wall can be increased by increasing the stiffness of the wall and increasing the vertical load. The shear strength of the new load transfer beam is less than that of the other specimens with the same structure.
The deformation of the wood shear wall can be divided into integral and local deformation. The whole deformation occurs mainly in the wooden frame, the wall bone column is separated from the bottom beam plate, and the lateral deformation of the whole wooden frame shear wall is increased. The local deformation of the wood shear wall is mainly caused by the slippage of the nail node between the wall panel and the wooden frame frame. The panels rotate around their respective central axes, and the wall panels become sloping rectangles.
The elastic anti lateral stiffness of the shear wall specimens with new load transfer beams is smaller than that of the articulated load transfer beam and the rigid load transfer beam shear wall specimens. The shear strength and ultimate displacement of the shear wall specimens of the new load transfer beams are less than the shear strength of the hinged steel beams and the continuous steel beams. Degree and limit displacement.
Under the action of unidirectional and repeated loads, the wood shear wall produces large internal forces in the continuous rigid load transfer beam, which shows that the upper wall can produce considerable counterforce to counteract the uplift force caused by the external load.
The stress distribution and deformation of the wooden frame shear wall can be obtained by the finite element analysis of the wood frame shear wall with the ANSYS software, which can deepen the understanding of the lateral force performance of the wood shear wall and provide the basis for the design of the wooden frame shear wall.
【学位授予单位】：南京林业大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU398.2

【参考文献】