落叶松胶合木双向板挠曲性能试验研究

发布时间：2018-03-07 13:15

本文选题：落叶松胶合木双向板　切入点：挠度和应变　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】：现代木结构具有环保可再生、绿色、低碳等特点,能实现我国环境保护的基本国策,同时促进了我国土木工程行业向绿色、低碳的方向发展,具有重要的经济、社会和生态效益。双向板作为关键受力构件在工业和民用建筑以及桥梁工程中应用十分广泛,尤其随着大跨度、大空间木结构建筑和桥梁的发展,双向板的应用跨度越来越大,而目前国内外关于落叶松胶合木双向板力学性能和计算试验研究较少,而且国内外的木结构设计规范对于胶合木双向板的刚度和挠度计算的规定并不明确,引起了很多争议。本文以兴安落叶松为原材料,选用间苯二酚为胶黏剂制造不同尺寸的胶合木双向板构件,进行了对边简支的胶落叶松合木双向板承受竖向均布荷载的挠曲性能试验,分析平面尺寸对落叶松胶合木双向板的挠度和应变的影响,并进行了数值分析和对比研究。本文的研究工作主要如下:(1)对比和总结了国内外胶合木结构的相关理论、研究成果以及实际工程情况;提出了国内外在胶合木双向板构件在设计和计算方法中的一些问题和不足。(2)对承受均布荷载的对边简支落叶松胶合木双向板进行了试验研究,设计了六块不同的对边简支双向板,测定了若干个点的挠度和应变值;研究落叶松胶合木双向板在竖向均布荷载作用下受力全过程挠度的发展规律,分析和比较跨度对胶合木双向板挠度和应变的影响,探究和验证板构件的宽跨比与板双向受力性能的关系总结落叶松胶合木双向板的荷载-挠度及荷载-应变变化规律,同时也为验证理论分析结果提供试验数据,为今后关于胶合木双向板更进一步的试验研究打下一定基础。(3)采用有限元Midas Civil软件对落叶松胶合木双向板在均布荷载下的受力性能进行了数值模拟分析,研究其荷载-位移关系和应力应变分布规律,并与试验结果进行对比研究。分析结果表明:数值模拟与试验结果较接近,在弹性阶段的拟合非常接近,在均布荷载增大时存在一定的差异值,并分析了存在差异的原因,为胶合木双向板的设计计算与理论研究打下一定基础。(4)采用有限元Midas Civil软件对四边简支、邻边简支的边界条件下的落叶松胶合木双向板在均布荷载下的受力性能进行了数值模拟分析,总结其荷载-位移曲线和应力应变分布规律,并根据分析结果归纳理论分析结论。为日后关于胶合木双向板进一步的参数分析和理论研究打下一定理论基础。
[Abstract]:Modern wood structure has the characteristics of environmental protection and regeneration, green, low carbon and so on. It can realize the basic national policy of environmental protection of our country, at the same time promote the development of civil engineering industry to green and low carbon, so it has important economy. Social and ecological benefits. As a key force member, bidirectional slab is widely used in industrial and civil buildings as well as in bridge engineering, especially with the development of large-span, large-space wooden structure building and bridge, the application span of bidirectional slab is becoming larger and larger. At present, there are few researches on mechanical properties and calculation tests of bidirectional plank of Larix gmelini, and the design code of wood structure at home and abroad is not clear about the calculation of stiffness and deflection of bidirectional plywood. In this paper, resorcinol is used as adhesive agent to manufacture different size composite wood bidirectional board members, which is made of Larix gmelini as raw material and resorcinol as adhesive. In this paper, the flexural behavior of the double-direction plank of Larix gmelinii under vertical uniform load is tested, and the effect of plane size on the deflection and strain of the bidirectional plate of Larix gmelini is analyzed. The main research work of this paper is as follows: 1) the relative theories, research results and practical engineering situation of glued wood structures at home and abroad are compared and summarized. This paper presents some problems and shortcomings in the design and calculation methods of plywood bidirectional plank members at home and abroad. The experimental study is carried out on the opposite simply supported Larix gmelinii bidirectional plank subjected to uniform distribution load. The deflection and strain values of several points were measured by designing six different opposite simply supported bidirectional plates, and the development law of deflection of Larix gmelini bidirectional plate under vertical uniform load was studied. This paper analyzes and compares the influence of span on deflection and strain of plywood bidirectional slab, explores and verifies the relationship between the ratio of width to span and the bidirectional mechanical behavior of plywood and summarizes the load-deflection and load-strain variation of the bidirectional plate of Larix gmelini. It also provides experimental data for the verification of theoretical analysis results. In order to lay a certain foundation for further experimental study of plywood bidirectional plate in the future, the finite element Midas Civil software is used to simulate and analyze the mechanical behavior of Larix gmelini bidirectional plate under uniform load. The load-displacement relationship and stress-strain distribution are studied and compared with the experimental results. The results show that the numerical simulation is close to the experimental results, and the fitting in the elastic stage is very close. There is a certain difference value when the uniform load increases, and the reason of the difference is analyzed, which lays a certain foundation for the design, calculation and theoretical study of the glued wood bidirectional plate. The finite element Midas Civil software is used to simply support the four sides. Under the boundary condition of simple support with adjacent edge, the mechanical behavior of the laminated plank of Larix gmelini under uniform load is numerically simulated, and the load-displacement curve and stress-strain distribution are summarized. According to the analysis results, the conclusion of theoretical analysis is concluded, which lays a certain theoretical foundation for further parameter analysis and theoretical study of glued wood bidirectional panels in the future.
【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】：TU366.3

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