胶合木拱桥静力性能研究

发布时间：2018-11-13 13:46

【摘要】：现代胶合木拱桥是以胶合木为主要材料的新型桥梁,现代胶合木结构具有自重轻、工期短、保温隔音、节约能源等优点,在国外已经普遍存在,而在中国尚在起步阶段。随着越来越多的现代胶合木拱桥运用于工程实际,对其受力特性研究显得十分必要。本文以张花高速服务区跨线人行天桥工程为背景,介绍了木结构桥梁在国内外发展过程及现状,采用有限元模拟和模型试验两种方法对落叶松胶合木拱桥静力性能进行研究。主要完成以下工作:1、根据相关规范对随机截取于制作模型桥同一批材料的试件进行了力学性能试验,测出顺纹方向力学参数;2、采用Midas civil/2015建立实桥和1:3缩尺模型的有限元模型,通过对结构进行离散以及对单元和连接部位的模拟,分析给出结构恒载内力图和活载包络图,为后文工况选取和测点布置提供依据;3、根据相似理论以及试验条件,设计并制作了胶合木模型拱桥,并对支座和试验过程中需要用到的标准配重块进行设计,完成了模型拱桥的静载试验;4、根据数值模拟结果,确定模型试验加载工况以及在各个工况下的荷载布置位置,并对模型桥在各工况下的受力情况进行仿真分析。计算每个工况对应的测点位移和应变,并与试验值进行对比。分析结果表明:应变测量值与实桥计算值相吻合,位移值与实桥计算值成比例,说明试验结果能够反映实桥受力情况;试验值与模型桥计算值吻合较好,有限元模型可靠;模型桥在各工况下最大拉压应力均小于设计强度值,且在完成10个工况后模型桥残余变形小,验证了结构变形在弹性范围内,且有较大的安全储备。落叶松胶合木结构能够运用于工程实际。本文的研究成果为落叶松胶合木拱桥的推广和应用提供了依据,对其他模型试验也有参考价值。
[Abstract]:The modern glued wood arch bridge is a new type of bridge with glued wood as the main material. The modern glued wood structure has the advantages of light weight, short construction period, insulation and sound insulation, energy saving and so on. It has been widely existed in foreign countries, but it is still in its infancy in China. As more and more modern glued wood arch bridges are used in engineering practice, it is necessary to study their mechanical characteristics. Based on the cross-line footbridge project in Zhanghua high speed service area, this paper introduces the development process and present situation of wood structure bridge at home and abroad, and studies the static performance of larch glued wood arch bridge by two methods: finite element simulation and model test. The main works are as follows: 1. According to the relevant codes, the mechanical properties of the same batch of materials that were randomly intercepted in the model bridge were tested, and the mechanical parameters along the direction of the grain were measured; 2. The finite element model of real bridge and 1:3 scale model is established by Midas civil/2015. Through the discretization of the structure and the simulation of the element and the connecting position, the dead load internal force diagram and the live load envelope diagram of the structure are analyzed and given. It provides the basis for the selection of working conditions and the layout of measuring points. 3. According to the similarity theory and test conditions, the glued wood model arch bridge is designed and manufactured, and the support and the standard weight distribution block used in the test process are designed, and the static load test of the model arch bridge is completed. 4. According to the result of numerical simulation, the loading condition of model test and the position of load arrangement under each condition are determined, and the simulation analysis of the model bridge under each condition is carried out. The displacement and strain of each measuring point are calculated and compared with the test data. The results show that the measured strain values are in good agreement with the calculated values of the real bridges, the displacement values are proportional to the calculated values of the real bridges, and the test results can reflect the stress of the real bridges, the experimental values are in good agreement with the calculated values of the model bridges, and the finite element models are reliable. The maximum tensile and compressive stress of the model bridge under each working condition is less than the design strength, and the residual deformation of the model bridge is small after the completion of 10 working conditions, which verifies that the structural deformation is in the elastic range and has a large safety reserve. Larch glued wood structure can be used in engineering practice. The research results of this paper provide the basis for the popularization and application of Larix gmelini arch bridge, and also have reference value for other model tests.
【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】：U441

【相似文献】