本文選題：薄壁鋼箱混凝土墩柱 + PBL�。� 參考：《長安大學(xué)》2014年碩士論文

【摘要】：在橋梁工程技術(shù)革新的背景下，橋梁設(shè)計(jì)跨度不斷增大，墩高也在不斷被刷新，開展新型墩柱結(jié)構(gòu)的研究成為一項(xiàng)迫切的課題，具有重要的理論意義和工程應(yīng)用價(jià)值�；阡撓浠炷两Y(jié)構(gòu)優(yōu)良的力學(xué)性能以及鋼箱易屈曲的特點(diǎn)，提出PBL加勁型薄壁鋼箱混凝土墩柱結(jié)構(gòu)。本文在前期試驗(yàn)研究的基礎(chǔ)上，利用ABAQUS有限元分析軟件，對其開展一系列研究，主要內(nèi)容包括： 1．研究PBL加勁型薄壁鋼箱混凝土墩柱的有限元模擬方法，重點(diǎn)研究PBL加勁肋的模擬方法，研究PBL、鋼箱、核心混凝土相互作用關(guān)系的模擬方法，并基于試驗(yàn)結(jié)果調(diào)整模型參數(shù)，得到了較為精確的有限元分析模型。 2．進(jìn)行了PBL加勁型薄壁鋼箱混凝土軸壓短柱的有限元分析，同時(shí)建立普通鋼箱混凝土、設(shè)鋼板縱肋鋼箱混凝土短柱的對比模型，深入研究其受力傳力機(jī)理和破壞模式，分析鋼-混界面力學(xué)性能，探討其受力優(yōu)越性，并進(jìn)行了PBL開孔率的承載力影響分析。 3．開展了PBL加勁型薄壁鋼箱混凝土軸壓長柱的有限元分析，，同時(shí)建立普通鋼箱混凝土、設(shè)鋼板縱肋鋼箱混凝土長柱的對比模型。通過結(jié)構(gòu)變形圖、應(yīng)力云圖、應(yīng)力路徑關(guān)系曲線，深入研究不同截面形式長柱的受力機(jī)理和破壞模式；通過荷載-位移關(guān)系曲線、荷載-縱橫向應(yīng)變關(guān)系曲線、極限承載力及位移延性系數(shù)對比分析各類長柱的整體力學(xué)性能；并研究了長細(xì)比對長柱破壞模式的影響。 4．以某連續(xù)剛構(gòu)橋高墩為原型，簡要設(shè)計(jì)了其PBL加勁型空心薄壁鋼箱混凝橋墩形式。充分利用對稱性，建立了橋墩節(jié)段的1/8單板模型，分析其整體力學(xué)性能、鋼-混界面力學(xué)性能、受力機(jī)理和破壞模式，對其實(shí)際應(yīng)用提供參考和建議。
[Abstract]:Under the background of the technical innovation of bridge engineering, the design span of the bridge is increasing and the height of the pier is being refreshed constantly. It is an urgent task to carry out the research on the new pier and column structure, which has important theoretical significance and engineering application value. Based on the excellent mechanical properties of steel box concrete structure and the easy buckling characteristics of steel box, PBL stiffened thin-walled steel box concrete pier column structure is proposed. On the basis of previous experimental research, a series of studies are carried out by Abaqus finite element analysis software. The main contents are as follows: 1. The finite element simulation method of PBL stiffened thin-walled steel box concrete pier column is studied. The simulation method of PBL stiffener and the simulation method of PBL, steel box and core concrete interaction are studied, and the model parameters are adjusted based on the test results. A more accurate finite element analysis model is obtained. 2. The finite element analysis of PBL stiffened thin-walled steel box concrete columns under axial compression is carried out. At the same time, the comparison model of ordinary steel box concrete and steel plate longitudinal ribbed concrete short columns is established. The mechanism of force transfer and failure mode are studied, the mechanical properties of steel-mixing interface are analyzed, and the superiority of force transfer is discussed. The influence of PBL porosity on bearing capacity is analyzed. 3. Finite element analysis of PBL stiffened thin-walled steel box concrete columns under axial compression is carried out, and the common steel box concrete is established at the same time. A comparative model of steel box concrete column with steel plate longitudinal rib. Through the structural deformation diagram, stress cloud diagram, stress path relation curve, the stress mechanism and failure mode of long columns with different cross-section forms are deeply studied, the load-displacement relation curve, the load-longitudinal and transverse strain relation curve, The ultimate bearing capacity and displacement ductility coefficient are compared to analyze the overall mechanical properties of all kinds of long columns, and the influence of aspect ratio on the failure mode of long columns is studied. 4. Taking the high pier of a continuous rigid frame bridge as the prototype, The PBL stiffened hollow thin-walled steel box concrete pier is designed briefly. Based on the symmetry, the one-eighth veneer model of pier segment is established, and its overall mechanical properties, mechanical properties of steel-mixing interface, stress mechanism and failure mode are analyzed. The results provide some references and suggestions for its practical application.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.5;U443.22

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