胶合木—混凝土组合梁桥整体性能研究

发布时间：2018-03-20 10:36

  本文选题：胶合木-混凝土组合梁桥　切入点：槽口-栓钉剪力连接件　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】：木-混凝土组合结构是一种新型结构,充分发挥了木材受拉和混凝土受压的优越性能,且相对钢筋混凝土结构而言此种组合结构能耗低、排放少、质量轻。该类结构虽在欧美国家已有广泛应用,但还没有形成完整的理论体系,在国内还处于起步阶段。目前对木-混凝土组合结构的研究大多数集中在组合梁的破坏试验和剪力连接件的推出试验等方面。胶合木-混凝土组合梁桥由胶合木梁和混凝土板组合而成,本文从组合梁桥整体性能的角度来研究其力学性能。本文利用有限元分析软件Midas Civil对胶合木-混凝土组合梁桥建立实体模型进行数值分析,从静力和动力方面研究组合梁桥的变形机理和整体受力行为;通过对实际结构模型的静力和动力测试,分析比较实测值及理论值,来验证计算模型的正确性,探究胶合木梁与混凝土板的共同作用机理,为胶合木-混凝土组合梁桥的设计提供试验和理论依据;总结胶合木-混凝土组合梁桥的加工制作流程和施工工艺。在静力试验过程中,按照试验荷载效应与计算荷载效应内力等效的原则进行加载,在跨中区域采用堆载的方式进行荷载的施加;采用突然卸载法来测量胶合木-混凝土组合梁桥的自振频率;采用白噪声环境激励法测量结构的振型。静力试验结果表明,混凝土板与胶合木梁能够有效地共同工作,对以槽口-栓钉为剪力连接件的胶合木-混凝土组合简支梁桥,不同的支座类型对其梁端滑移有较大影响;荷载-挠度曲线基本呈现线性变化,说明整体结构处于弹性变形阶段;在240kN荷载作用下混凝土板与胶合木梁仍有共同的中性轴,可判断组合梁桥满足平截面的假定。综合分析组合梁桥的滑移、挠度和应变可知,所拟定尺寸的组合梁桥基本满足公路-Ⅱ级的荷载等级要求。将理论计算值与实测值进行对比发现,实测数据和理论数据吻合较好,说明本文所用的有限元计算模型可靠、正确。从动力测试结果得知,组合梁桥的频率理论计算值比实测值要小,说明桥梁实际刚度好于有限元模型的刚度;实测结构振型与有限元模拟振型相一致,验证了理论模型的正确性。
[Abstract]:Wood-concrete composite structure is a new type of structure, which gives full play to the superior properties of wood tension and concrete compression. Compared with reinforced concrete structure, this kind of composite structure has low energy consumption and less emission. Light weight. Although this kind of structure has been widely used in Europe and the United States, it has not yet formed a complete theoretical system. At present, most of the researches on wood-concrete composite structures focus on the failure test of composite beams and the introduction test of shear connectors. The glued wood-concrete composite beam bridge is composed of glued wood. Beams and concrete slabs, In this paper, the mechanical properties of composite beam bridges are studied from the point of view of the whole performance. In this paper, the finite element analysis software Midas Civil is used to analyze the solid model of glued wood-concrete composite beam bridges. From the static and dynamic aspects, the deformation mechanism and the overall behavior of the composite beam bridge are studied, and the correctness of the calculation model is verified by the static and dynamic test of the actual structure model, and the analysis and comparison of the measured values and the theoretical values. In order to provide experimental and theoretical basis for the design of glued wood-concrete composite beam bridge, this paper explores the interaction mechanism of glued wood beam and concrete slab. The fabrication process and construction technology of glued wood-concrete composite beam bridge are summarized. In the static test process, loading is carried out according to the principle of equivalent test load effect and calculation load effect internal force. In the middle span region, the load is applied by means of surcharge, the natural vibration frequency of the composite beam bridge is measured by sudden unloading method, the vibration mode of the structure is measured by white noise environment excitation method, and the static test results show that, Concrete slabs and glued wood beams can work together effectively, and different types of support have great influence on the slippage of the beam end of the composite simply supported beam bridge, which is made of slot and bolt as shear connectors. The load-deflection curve basically presents linear variation, which indicates that the whole structure is in the elastic deformation stage, and the concrete slab and the glued wood beam still have a common neutral axis under the load of 240 KN. It can be judged that composite beam bridge satisfies the assumption of plane section. The slip, deflection and strain of composite beam bridge are analyzed synthetically. The size of the composite girder bridge basically meets the load grade requirements of the highway-鈪，

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