本文選題：混合體系斜拉橋 + 結(jié)構(gòu)體系參數(shù)�。� 參考：《湖南大學(xué)》2016年碩士論文

【摘要】：混合體系斜拉橋邊跨采用混凝土主梁,中跨采用鋼主梁或鋼-混疊合梁,綜合了兩種主梁材料的優(yōu)點(diǎn),是一種非常具有潛力的新型橋梁形式。相比于普通斜拉橋,混合體系斜拉橋在結(jié)構(gòu)受力、主跨跨越能力、施工安全和質(zhì)量保證以及對(duì)地形的適應(yīng)性等方面具有不可比擬的優(yōu)越和靈活性,在特大跨徑橋梁設(shè)計(jì)中具有獨(dú)特的競爭力。本文以一座主跨360m混合式疊合梁斜拉橋?yàn)楣こ桃劳?主要針對(duì)混合體系斜拉橋的合理結(jié)構(gòu)體系,疊合梁剪力滯效應(yīng)計(jì)算以及混凝土收縮徐變對(duì)全橋受力影響進(jìn)行分析研究,為同類橋梁的優(yōu)化設(shè)計(jì)提供一定的參考。本文的主要工作及成果如下:(1)查閱國內(nèi)外相關(guān)的文獻(xiàn)資料,對(duì)混合體系斜拉橋的發(fā)展歷程、受力特點(diǎn)以及優(yōu)缺點(diǎn)進(jìn)行全面的闡述。(2)對(duì)混合體系斜拉橋理想成橋狀態(tài)、合理邊中跨比、合理塔高比進(jìn)行理論上的推導(dǎo),并對(duì)烏江橋合理結(jié)構(gòu)體系在理論上予以分析驗(yàn)證�；谟邢拊Ｐ�,分別研究了邊主梁剛度、主塔剛度、主塔高度、邊中跨比等結(jié)構(gòu)體系參數(shù),計(jì)算分析各項(xiàng)參數(shù)對(duì)混合體系斜拉橋結(jié)構(gòu)受力影響。(3)基于現(xiàn)階段國內(nèi)外研究現(xiàn)狀,針對(duì)斜拉橋疊合梁剪力滯效應(yīng),采用基于全橋桿系、局部桿系和局部實(shí)體三個(gè)分析模型相結(jié)合的計(jì)算方法,獲得了典型代表區(qū)域“上”字型鋼-混疊合梁的正應(yīng)力分布和有效寬度系數(shù)。(4)計(jì)算混凝土收縮徐變對(duì)混合體系斜拉橋整體結(jié)構(gòu)受力和疊合梁應(yīng)力重分布的影響,對(duì)比分析三年和十年收縮徐變的進(jìn)展情況,并考慮了混凝土不同加載齡期對(duì)收縮徐變的影響,驗(yàn)證了烏江橋疊合梁預(yù)制橋面板加載齡期的合理性。
[Abstract]:The concrete main beam is used in the side span of the cable-stayed bridge with hybrid system, and the steel main beam or the steel-composite composite beam is used in the middle span, which combines the advantages of the two kinds of main girder materials and is a new type of bridge with great potential. Compared with ordinary cable-stayed bridges, hybrid cable-stayed bridges have incomparable advantages and flexibility in structural stress, span capacity, construction safety, quality assurance and adaptability to terrain. It has unique competitiveness in the design of long span bridges. Based on a 360m hybrid cable-stayed bridge with main span, this paper mainly focuses on the reasonable structural system of the cable-stayed bridge with hybrid system, the calculation of the shear lag effect of the composite beam and the influence of concrete shrinkage and creep on the stress of the whole bridge. It provides a certain reference for the optimization design of similar bridges. The main work and results of this paper are as follows: 1) referring to the relevant literature data at home and abroad, the development course, mechanical characteristics, advantages and disadvantages of hybrid cable-stayed bridges are expounded comprehensively. 2) the ideal bridge status of hybrid cable-stayed bridges is discussed. The reasonable ratio of side to middle span and the ratio of tower to height are deduced theoretically, and the reasonable structure system of Wujiang Bridge is analyzed and verified theoretically. Based on the finite element model, the structural parameters, such as the stiffness of the main beam, the height of the main tower and the ratio of the side to middle span, are studied, and the effects of the parameters on the stress of the cable-stayed bridge with hybrid system are calculated and analyzed. Aiming at the shear lag effect of superimposed beam of cable-stayed bridge, the calculation method based on the three analytical models of the whole bridge bar system, the local member system and the local solid is adopted. In this paper, the normal stress distribution and effective width coefficient of typical "upper" section steel-composite beams are obtained. The effect of shrinkage and creep of concrete on the stress and stress redistribution of composite cable-stayed bridges is calculated. By comparing and analyzing the progress of shrinkage and creep in three years and ten years, and considering the influence of different loading ages on shrinkage and creep of concrete, the rationality of loading age of precast deck slab of composite beam of Wujiang Bridge is verified.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U441;U448.27

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