胶合木—钢夹板螺栓连接力学性能试验研究

发布时间：2018-03-10 23:30

本文选题：胶合木-钢夹板螺栓　切入点：力学性能　出处：《中南林业科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国林木资源储备丰富,然而国产速生工程木材资源相当匮乏,木结构工程材主要依靠进口。现代木结构的研究和应用也落后于欧美、日本等发达国家,因此,我国亟需开展现代木结构的理论研究和实践应用。本文以东北落叶松胶合木和钢夹板作为对象,通过材性试验,借助有限元计算工具,从胶合木与螺栓厚径比、螺栓间距、并列和错列方式等三种影响因素对胶合木-钢夹板螺栓连接力学性能进行探讨,以期对未来相关木结构螺栓连接的应用提供依据,主要从以下几个方面着手:(1)归纳已有的螺栓连接相关理论,得出几种典型螺栓连接破坏模式,并通过基本假定推导螺栓连接承载力计算公式。(2)通过材性试验获取胶合木材料参数,得出材料的本构关系,建立有限元模型进行理论分析,并得到多螺栓连接力学性能的若干相关结论。(3)通过厚径比对螺栓连接力学性能影响的试验研究,得出厚径比不仅影响螺栓连接的承载力大小,而且改变螺栓破坏模式;得到合适厚径比为7.5～10;对比国内外螺栓连接计算公式,推导出胶合木-钢夹板螺栓连接理论计算公式且准确性良好。(4)通过螺栓间距对螺栓连接力学性能影响的试验研究,得出螺栓间距仅在一定范围内提高螺栓连接力学性能;采用Foschi公式拟合荷载-滑移曲线且适用性良好。(5)通过并列与错列两种螺栓布置对螺栓连接力学性能影响的试验研究,得出错列比并列能承受更大荷载但并列延性更佳;螺栓列数能够提高连接的力学性能;有限元模型相关结论和试验结果吻合较好。
[Abstract]:Our country is rich in forest resources, but domestic fast-growing engineering timber resources are quite scarce, wood structure engineering materials mainly rely on imports. The research and application of modern wood structures lag behind the developed countries, such as Europe, America and Japan, therefore, the research and application of modern wood structures lag behind the developed countries such as Europe, America and Japan. The theoretical research and practical application of modern wood structure are urgently needed in our country. This paper takes the plywood and steel splint of Larix gmelini as the object, through the test of wood properties, with the help of finite element calculation tool, from the ratio of thick diameter of glued wood to bolt, the distance between bolts and bolts. The mechanical properties of glued wood-steel splint connections are discussed by three influencing factors, such as juxtaposition and staggered way, in order to provide the basis for the application of bolt connections of wood structures in the future. Mainly from the following several aspects: 1) Induces the existing bolt connection related theories, obtains several typical bolt connection failure modes, Through the basic assumption to deduce the formula of bearing capacity of bolt connection. (2) the parameters of glued wood are obtained through the material test, the constitutive relation of the material is obtained, and the finite element model is established for theoretical analysis. Some relevant conclusions of mechanical properties of multi-bolt connections are obtained. (3) through the experimental study of the influence of thickness to diameter ratio on mechanical properties of bolt connections, it is concluded that the ratio of thickness to diameter not only affects the bearing capacity of bolt connections, but also changes the failure mode of bolts. The appropriate ratio of thickness to diameter is 7.5 ~ 10. Compared with the formula of bolt connection at home and abroad, the theoretical formula of glued wood-steel splint bolt connection is derived, and the accuracy of the formula is good. The experimental study on the effect of bolt spacing on the mechanical properties of bolt connection is carried out. It is concluded that the bolt spacing can only improve the mechanical properties of bolt connections within a certain range, and the Foschi formula is used to fit the load-slip curve and the applicability is good. (5) the experimental study on the effect of parallel and staggered bolt arrangement on the mechanical properties of bolt connections is carried out. The results show that the error row ratio can withstand more loads but the parallel ductility is better; the bolt number can improve the mechanical properties of the connection; and the relevant conclusions of the finite element model agree well with the test results.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

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