【摘要】：鋼桁—混凝土T構(gòu)組合結(jié)構(gòu)橋梁是混凝土箱梁橋面板與鋼桁架共同受力的一種新型組合結(jié)構(gòu)，因其剛度大、結(jié)構(gòu)自重低、整體穩(wěn)定性好、抗震性能強(qiáng)和行車(chē)平順等一系列優(yōu)點(diǎn)，已在各國(guó)的公路和高速鐵路中得到廣泛應(yīng)用。但是在日照或者氣候變化的影響下，鋼桁架和混凝土都會(huì)產(chǎn)生不同程度的溫度應(yīng)力和變形，因此很容易導(dǎo)致混凝土出現(xiàn)開(kāi)裂的問(wèn)題。從既有的研究來(lái)看，國(guó)內(nèi)外橋梁專(zhuān)家學(xué)者針對(duì)混凝土箱梁橋的溫度效應(yīng)做了大量的研究工作，積累了許多寶貴的經(jīng)驗(yàn)，但是對(duì)于鋼桁—T構(gòu)組合梁橋溫度效應(yīng)及開(kāi)裂問(wèn)題沒(méi)有得到足夠的重視。本文結(jié)合新建高速鐵路大同至西安某黃河特大橋主跨部分單T剛構(gòu)加勁鋼桁組合結(jié)構(gòu)實(shí)際工程，深入研究鋼桁—T構(gòu)組合梁橋溫度場(chǎng)分布規(guī)律，完善溫度效應(yīng)理論計(jì)算和實(shí)橋測(cè)試研究，分析了鋼桁—T構(gòu)組合梁橋開(kāi)裂機(jī)理，給出了裂縫控制措施�；谝陨戏治�，本文在以往研究的基礎(chǔ)上利用空間有限元軟件對(duì)該單T剛構(gòu)加勁鋼桁組合橋梁進(jìn)行計(jì)算分析，主要進(jìn)行了以下工作： 1．通過(guò)對(duì)鋼桁架結(jié)構(gòu)日照溫度場(chǎng)的監(jiān)測(cè)以及氣象資料的分析，得到了鋼桁在日照作用下的溫度分布規(guī)律和極端溫度荷載分布情況。并根據(jù)溫度分布規(guī)律，分析了鋼桁架在日照影響、極端溫度荷載、極端溫度荷載與恒活載組合三種荷載工況。 2．建立某黃河特大橋主跨部分單T剛構(gòu)加勁鋼桁組合結(jié)構(gòu)空間有限元模型，計(jì)算分析了鋼桁架分別在三種工況下橋梁支座豎向反力、桁架應(yīng)力及混凝土應(yīng)力與位移變化規(guī)律。得出了在線性溫度荷載作用下，支座豎向反力、桁架應(yīng)力和混凝土應(yīng)力均為線性變化；極端溫度荷載作用下，，相互對(duì)立的鋼桁架V型斜桿總是一邊受拉一邊受壓，升溫荷載作用使主梁上撓，降溫荷載作用使主梁下?lián)�；在極端溫度荷載與恒活載組合作用下，掌握了橋梁最不利情況下的桁架應(yīng)力以及混凝土主梁應(yīng)力、撓度變化情況。 3．研究了鋼桁—混凝土T構(gòu)組合梁橋桁架與混凝土結(jié)合處的連接類(lèi)型，得到了溫度變化對(duì)桁架與混凝土連接處受力的影響機(jī)理。建立結(jié)合點(diǎn)三維實(shí)體有限元模型，計(jì)算分析了極端溫度荷載作用和組合作用兩種最不利情況，得到了此時(shí)全橋混凝土應(yīng)力最大位置處結(jié)合點(diǎn)混凝土的應(yīng)力以及裂縫情況。 4．本文根據(jù)計(jì)算結(jié)論結(jié)合相關(guān)文獻(xiàn)，分析了鋼桁—混凝土T構(gòu)組合橋梁溫度裂縫的特點(diǎn)以及成因，繼而提出了鋼桁—混凝土T構(gòu)組合橋梁溫度裂縫的防裂措施，用以指導(dǎo)這類(lèi)橋梁的設(shè)計(jì)與施工。
[Abstract]:Steel truss-concrete T-structure composite structure bridge is a new type of composite structure with concrete box girder bridge slabs and steel truss. It has a series of advantages such as high stiffness, low deadweight, good overall stability, strong seismic performance and smooth running, etc. It has been widely used in highway and high-speed railway all over the world. However, under the influence of sunshine or climate change, both steel truss and concrete will produce different degrees of thermal stress and deformation, so it is easy to cause cracking of concrete. From the existing research, bridge experts and scholars at home and abroad have done a lot of research work on the temperature effect of concrete box girder bridge, and accumulated a lot of valuable experience. However, not enough attention has been paid to the temperature effect and cracking of steel truss-T composite girder bridge. In this paper, the temperature field distribution of steel truss composite girder bridge with steel truss is studied in combination with the practical engineering of single T rigid frame stiffened steel truss composite structure in the main span of a new high-speed railway from Datong to a certain Yellow River super large bridge in Xi'an. The theoretical calculation of temperature effect and the test of real bridge are improved. The cracking mechanism of steel truss-T composite beam bridge is analyzed and the crack control measures are given. Based on the above analysis, this paper uses the spatial finite element software to calculate and analyze the single T rigid frame stiffened steel truss composite bridge based on the previous research. The main work is as follows: 1. The temperature distribution and extreme temperature load distribution of steel truss under sunlight are obtained by monitoring the temperature field of steel truss structure and analyzing meteorological data. According to the temperature distribution, the influence of steel truss on the extreme temperature load is analyzed. Extreme temperature load and dead load combination. 2. A spatial finite element model of a single T rigid frame stiffened steel truss composite structure with main span of a Yellow River bridge is established. The vertical reaction force, truss stress and concrete stress and displacement of steel truss are calculated and analyzed under three working conditions. Under the action of linear temperature load, the vertical reaction force, truss stress and concrete stress of the bearing are all linearly changed, and under extreme temperature load, the V-shaped oblique bar of steel truss is always subjected to tension and compression at the same time. Under the combined action of extreme temperature load and dead load, the stress of truss and the stress of main beam of concrete under the most disadvantageous condition of bridge are grasped. 3. The connection type between truss and concrete of steel truss-concrete composite beam bridge is studied, and the influence mechanism of temperature change on the joint force between truss and concrete is obtained. The 3D solid finite element model of the junction point is established, and the two most disadvantageous cases of extreme temperature load and combination action are calculated and analyzed. At this time, the stress and crack of the concrete at the joint point at the maximum stress position of the whole bridge concrete are obtained. 4. According to the calculation conclusion, the paper combines the relevant literature, This paper analyzes the characteristics and causes of temperature cracks of steel truss-concrete T-structure composite bridges, and then puts forward the measures to prevent the temperature cracks of steel truss-concrete T-structure composite bridges, which can be used to guide the design and construction of this kind of bridges.
【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(lèi)號(hào)】：U441.5

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