本文選題：膠合木-混凝土組合梁橋　切入點(diǎn)：槽口-栓釘剪力連接件　出處：《中南林業(yè)科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：木-混凝土組合結(jié)構(gòu)是一種新型結(jié)構(gòu),充分發(fā)揮了木材受拉和混凝土受壓的優(yōu)越性能,且相對鋼筋混凝土結(jié)構(gòu)而言此種組合結(jié)構(gòu)能耗低、排放少、質(zhì)量輕。該類結(jié)構(gòu)雖在歐美國家已有廣泛應(yīng)用,但還沒有形成完整的理論體系,在國內(nèi)還處于起步階段。目前對木-混凝土組合結(jié)構(gòu)的研究大多數(shù)集中在組合梁的破壞試驗(yàn)和剪力連接件的推出試驗(yàn)等方面。膠合木-混凝土組合梁橋由膠合木梁和混凝土板組合而成,本文從組合梁橋整體性能的角度來研究其力學(xué)性能。本文利用有限元分析軟件Midas Civil對膠合木-混凝土組合梁橋建立實(shí)體模型進(jìn)行數(shù)值分析,從靜力和動(dòng)力方面研究組合梁橋的變形機(jī)理和整體受力行為;通過對實(shí)際結(jié)構(gòu)模型的靜力和動(dòng)力測試,分析比較實(shí)測值及理論值,來驗(yàn)證計(jì)算模型的正確性,探究膠合木梁與混凝土板的共同作用機(jī)理,為膠合木-混凝土組合梁橋的設(shè)計(jì)提供試驗(yàn)和理論依據(jù);總結(jié)膠合木-混凝土組合梁橋的加工制作流程和施工工藝。在靜力試驗(yàn)過程中,按照試驗(yàn)荷載效應(yīng)與計(jì)算荷載效應(yīng)內(nèi)力等效的原則進(jìn)行加載,在跨中區(qū)域采用堆載的方式進(jìn)行荷載的施加;采用突然卸載法來測量膠合木-混凝土組合梁橋的自振頻率;采用白噪聲環(huán)境激勵(lì)法測量結(jié)構(gòu)的振型。靜力試驗(yàn)結(jié)果表明,混凝土板與膠合木梁能夠有效地共同工作,對以槽口-栓釘為剪力連接件的膠合木-混凝土組合簡支梁橋,不同的支座類型對其梁端滑移有較大影響;荷載-撓度曲線基本呈現(xiàn)線性變化,說明整體結(jié)構(gòu)處于彈性變形階段;在240kN荷載作用下混凝土板與膠合木梁仍有共同的中性軸,可判斷組合梁橋滿足平截面的假定。綜合分析組合梁橋的滑移、撓度和應(yīng)變可知,所擬定尺寸的組合梁橋基本滿足公路-Ⅱ級(jí)的荷載等級(jí)要求。將理論計(jì)算值與實(shí)測值進(jìn)行對比發(fā)現(xiàn),實(shí)測數(shù)據(jù)和理論數(shù)據(jù)吻合較好,說明本文所用的有限元計(jì)算模型可靠、正確。從動(dòng)力測試結(jié)果得知,組合梁橋的頻率理論計(jì)算值比實(shí)測值要小,說明橋梁實(shí)際剛度好于有限元模型的剛度;實(shí)測結(jié)構(gòu)振型與有限元模擬振型相一致,驗(yàn)證了理論模型的正確性。
[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，

本文編號(hào)：1638705