【摘要】：預(yù)制裝配式小箱梁由于其施工方法簡(jiǎn)單可行，結(jié)構(gòu)安全可靠，造價(jià)低，施工工廠化、標(biāo)準(zhǔn)化和裝配化，養(yǎng)護(hù)工程量小及抗震能力強(qiáng)等優(yōu)點(diǎn)，在跨徑20—40米的高速公路和城市道路高架橋建設(shè)中得到較為廣泛應(yīng)用。 預(yù)制小箱梁橋結(jié)構(gòu)受力分析較為復(fù)雜,設(shè)計(jì)及施工質(zhì)量較難控制,裂縫問題出現(xiàn)較多，，裂縫的出現(xiàn)會(huì)使鋼筋銹蝕,結(jié)構(gòu)的承載力急驟下降,必須給予充分重視。本文以工程中遇到的實(shí)際問題為基礎(chǔ)，應(yīng)用有限元法，對(duì)橋梁的裂縫進(jìn)行模擬，并結(jié)合現(xiàn)場(chǎng)實(shí)驗(yàn)，分析裂縫產(chǎn)生的原因以及對(duì)梁體的結(jié)構(gòu)性影響，為深入研究裂縫對(duì)小箱梁的影響提供參考，主要開展如下工作： 1、結(jié)合在工程實(shí)踐中遇到的問題，建立單梁及整橋的有限元模型，分析梁體中裂縫的發(fā)展情況及規(guī)律，模擬梁體病害情況，分析梁體的承載能力，判定梁體的安全性和可靠性。 2、分別施加集中荷載和車輛荷載，分析梁體在成橋中的受力情況。 3、利用梁體現(xiàn)場(chǎng)的靜載實(shí)驗(yàn)結(jié)果，校準(zhǔn)模擬分析模型，對(duì)梁體及整橋的安全性做出評(píng)價(jià)與判定。
[Abstract]:The prefabricated small box girder has the advantages of simple and feasible construction method, safe and reliable structure, low cost, industrial construction, standardization and assembly, small amount of maintenance and strong seismic resistance, etc. It is widely used in the construction of 20-40 meters expressway and city road viaduct. The structural stress analysis of prefabricated small box girder bridge is more complicated, the quality of design and construction is difficult to control, the cracks appear more, the cracks will make the steel bar corrode, the bearing capacity of the structure must be reduced sharply, which must be paid more attention to. Based on the practical problems encountered in the engineering, the finite element method is used to simulate the cracks of the bridge, and combined with the field experiments, the causes of the cracks and the structural effects on the beam body are analyzed. In order to study the influence of cracks on small box girder, the main works are as follows: 1. Combining with the problems in engineering practice, the finite element model of single beam and whole bridge is established. This paper analyzes the development and law of cracks in beam body, simulates the condition of beam body disease, analyzes the bearing capacity of beam body, determines the safety and reliability of beam body. The stress of the beam body in the bridge is analyzed. 3. The safety of the beam body and the whole bridge is evaluated and judged by using the static load test results of the beam body and the calibration of the simulation analysis model.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441

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