本文選題：快速施工 + 鋼-混組合梁�。� 參考：《浙江大學》2017年碩士論文

【摘要】：圍繞現(xiàn)有城市及交通基礎設施建設中進行中小跨徑橋梁更換、維護或新建橋梁存在的交通干擾大、施工易受氣候影響及質(zhì)量難以控制等問題,提出了 一種面向工廠化預制生產(chǎn)、高度小、剛度大、能充分發(fā)揮鋼材及混凝土材料的強度、適應快速施工的高性能鋼-混組合小箱梁橋。在對其結構設計和施工方法的關鍵技術進行討論后,設計制作了相應的試驗模型梁,進行了不同群釘參數(shù)模型梁的試驗研究、數(shù)值分析及整橋的有限元分析,主要工作及成果如下:(1)討論了快速施工高性能鋼-混凝土組合小箱梁橋的標準模數(shù)選取,橫隔板的布置,橋面板的型式與劃分,高性能混凝土的應用,縱、橫向接縫的聯(lián)接方式,群釘?shù)脑O計與布置,預應力的配置,整體的設計、施工安裝等關鍵技術問題。(2)模擬高性能鋼-混組合小箱梁的快速施工,設計制作了四片快速施工高性能鋼-混組合小箱梁模型梁。通過試驗研究,得到了不同群釘?shù)牟贾瞄g距、數(shù)量和焊釘?shù)膸缀纬叽鐚ζ涫芰π袨榈挠绊?給出了撓度、應力以及極限抗彎承載力的計算建議。(3)建立單梁精細有限元模型,分析了荷載作用下的撓度、承載力、滑移量、和應力結果,數(shù)值計算結果與試驗結果吻合較好,研究得到了適合群釘組合梁的建模方法和理論計算公式。采用塑性設計方法能夠很好的得到群釘組合梁的極限抗彎承載力;按照換算截面法計算得到的鋼梁底板應力要比實測值和有限元分析得到的應力大。(4)根據(jù)群釘組合梁的劈裂機理,通過建立精細化的有限元推出試件模型,分析群釘和混凝土在復雜應力狀態(tài)下的性能,并給出相應的改進建議。參數(shù)分析后發(fā)現(xiàn),施加橫彎力和預壓應力后,焊釘?shù)钠骄辜袅涂辜魟偠染酗@著提高;焊釘?shù)母叨却笥谄渲睆降?倍后,焊釘高度變化對群釘中焊釘?shù)钠骄辜舫休d力和抗剪剛度影響不大。(5)采用殼單元模擬橋面板和薄壁鋼梁,用彈簧單元模擬組合梁群釘聯(lián)接的效應,建立了一座40m跨徑的快速施工鋼-混組合小箱梁橋的數(shù)值模型,分析了群釘剛度變化下結構的響應,并對該整橋結構的應力和撓度進行了驗算。結果表明正常使用極限狀態(tài)和承載能力極限狀態(tài)均符合要求,且具有較高的安全儲備。
[Abstract]:Around the existing cities and traffic infrastructure construction of small and medium-sized span bridge replacement, maintenance or new bridges exist in traffic interference, construction vulnerable to climate impact and difficult to control the quality, and so on. This paper presents a kind of high performance steel-concrete composite small box girder bridge with low height and large stiffness, which can give full play to the strength of steel and concrete materials and adapt to rapid construction. After discussing the key techniques of the structural design and construction method, the corresponding test model beam is designed and made, and the experimental research, numerical analysis and finite element analysis of the whole bridge are carried out. The main work and results are as follows: (1) the selection of standard modulus, the arrangement of transverse partition, the type and division of deck slab, the application of high performance concrete, and the longitudinal of high performance concrete composite small box girder bridge are discussed. The key technical problems such as the connection mode of transverse joints, the design and arrangement of group nails, the allocation of prestress, the whole design, the construction installation, etc. (2) simulating the rapid construction of high performance steel-mixed composite small box girder, Four model beams of high performance steel-concrete composite box girder are designed and manufactured. Based on the experimental study, the effects of the arrangement spacing, the number of nails and the geometric size of welded nails on their mechanical behavior are obtained. The calculation suggestions of deflection, stress and ultimate flexural bearing capacity are given. (3) the fine finite element model of single beam is established. The results of deflection, bearing capacity, slip and stress under load are analyzed. The numerical results are in good agreement with the experimental results. The plastic design method can be used to obtain the ultimate flexural bearing capacity of composite beams with group nails. The stress of the steel beam bottom plate calculated by the conversion section method is larger than that obtained by the measured value and the finite element analysis. (4) according to the splitting mechanism of the composite beam with group nails, the detailed finite element model is established. The properties of group nails and concrete under complex stress state are analyzed, and corresponding improvement suggestions are given. After parameter analysis, it is found that the average shear force and shear stiffness of the welded nail are significantly improved after applying transverse bending force and precompression stress, and the height of the welded nail is more than 4 times of its diameter. The variation of nail height has little effect on the average shear bearing capacity and shear stiffness of welded nails in group nails. (5) the shell element is used to simulate the bridge deck plate and thin-walled steel beam, and the spring element is used to simulate the effect of composite beam group nail connection. The numerical model of a 40m span fast construction steel-concrete composite small box girder bridge is established. The response of the structure under the change of the stiffness of the group nail is analyzed, and the stress and deflection of the whole bridge structure are checked and calculated. The results show that both the normal use limit state and the bearing capacity limit state meet the requirements and have a high safety reserve.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U441

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