本文選題：斜拉-自錨式懸索組合橋 + 鋼箱混凝土�。� 參考：《長(zhǎng)安大學(xué)》2014年碩士論文

【摘要】：斜拉-自錨式懸索組合結(jié)構(gòu)外形特點(diǎn)鮮明，結(jié)構(gòu)纖細(xì)美觀，景觀效果突出，是近幾年出現(xiàn)的一種新穎的組合體系結(jié)構(gòu)。由于本文提出的三塔斜拉-自錨式懸索組合橋國(guó)內(nèi)外尚未有成熟的橋例，因此缺少設(shè)計(jì)經(jīng)驗(yàn)、設(shè)計(jì)理論和方法，需要對(duì)其進(jìn)行深入的研究。本文即在全橋體系研究的基礎(chǔ)上，，深入探討斜置拱形鋼箱混凝土副塔的力學(xué)性能，按照構(gòu)造設(shè)計(jì)、參數(shù)分析、平面分析、空間精細(xì)化分析的流程開展了詳細(xì)的力學(xué)性能研究，得到如下主要結(jié)論： （1）開展鋼箱混凝土斜置拱形橋塔構(gòu)造參數(shù)研究，初步確定副塔主要構(gòu)造參數(shù)；在橋梁整體分析的基礎(chǔ)上，針對(duì)結(jié)構(gòu)尺寸、鋼板厚度和混凝土的貢獻(xiàn)開展參數(shù)分析和研究，初步了解了副塔結(jié)構(gòu)的力學(xué)特征。 （2）忽略副塔上部錨固區(qū)的局部應(yīng)力問題，以考察副塔整體受力狀態(tài)為目的，進(jìn)行了副塔整體空間有限元分析。計(jì)算結(jié)果表明，正常使用狀態(tài)下，副塔鋼箱最不利控制截面最大主拉應(yīng)力為37.7MPa，最大主壓應(yīng)力為85.5MPa；副塔塔座混凝土最大主拉應(yīng)力為1.34MPa，最大主壓應(yīng)力為8.05MPa，均小于規(guī)范設(shè)計(jì)值。 （3）為了充分掌握副塔上部主纜及背索錨固區(qū)的力學(xué)性質(zhì)，選取副塔C段鋼箱最大索力部位進(jìn)行局部精細(xì)化有限元分析，計(jì)算結(jié)果表明，錨具最大峰值主拉應(yīng)力為199MPa，最大峰值主壓應(yīng)力為287MPa，屬于墊板開孔處應(yīng)力集中現(xiàn)象，范圍極��；錨箱最大主拉應(yīng)力值為56.3MPa，最大主壓應(yīng)力為108MPa，均小于規(guī)范規(guī)定的鋼材容許應(yīng)力值。 研究結(jié)果表明，三塔斜拉-自錨式懸索組合橋斜置拱形副塔構(gòu)造參數(shù)設(shè)計(jì)合理，整體即局部受力均滿足規(guī)范要求，能夠保證依托工程橋梁的安全運(yùn)營(yíng)。
[Abstract]:The cable-stayed self-anchored suspension cable composite structure is a new kind of composite system which is characterized by its distinctive shape, fine and beautiful structure and outstanding landscape effect. Because the three-tower cable-stayed self-anchored composite bridge presented in this paper has not yet had a mature bridge case at home and abroad, there is a lack of design experience, design theory and method, which need to be deeply studied. On the basis of the research of the whole bridge system, the mechanical properties of the concrete auxiliary tower of oblique arch box are deeply discussed in this paper. According to the flow chart of structural design, parameter analysis, plane analysis and spatial fine analysis, the mechanical properties of the concrete auxiliary tower of oblique arch box are studied in detail. The main conclusions are as follows: 1) to study the structural parameters of steel box concrete oblique arch tower, to determine the main structural parameters of auxiliary tower, and to carry out parameter analysis and research on the structural size, thickness of steel plate and contribution of concrete on the basis of the overall analysis of the bridge. The mechanical characteristics of the auxiliary tower structure are preliminarily understood. 2) ignoring the local stress problem in the Anchorage area of the upper part of the auxiliary tower, the finite element analysis of the whole space of the auxiliary tower is carried out in order to investigate the stress state of the auxiliary tower as a whole. The calculation results show that the maximum principal tensile stress of the most unfavorable control section of the auxiliary tower steel box is 37.7MPa, the maximum principal compressive stress is 85.5 MPa, and the maximum main tensile stress of concrete of the auxiliary tower seat is 1.34MPa and the maximum principal compressive stress is 8.05MPa, which is less than the design value of the code. 3) in order to fully grasp the mechanical properties of the upper main cable of the auxiliary tower and the anchoring area of the back cable, the local fine finite element analysis of the maximum cable force of the steel box in section C of the auxiliary tower is carried out. The calculation results show that, The maximum principal tensile stress of Anchorage is 199MPa, and the maximum principal compressive stress is 287MPa, which belongs to the phenomenon of stress concentration at the opening of the plate, and the maximum principal tensile stress of the anchor box is 56.3 MPA and the maximum principal compressive stress is 108MPa, which is less than the allowable stress of steel as stipulated in the code. The research results show that the structural parameters of the oblique arch auxiliary tower of the three-tower cable-stayed self-anchored composite bridge are reasonable and the integral or local force can meet the requirements of the code and can guarantee the safe operation of the bridge relying on the engineering.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U448.25

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