本文關(guān)鍵詞： 預(yù)應(yīng)力混凝土箱形梁 主梁根部 錨固區(qū) 局部應(yīng)力　出處：《長安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：目前，許多橋梁均采用預(yù)應(yīng)力混凝土箱形梁建造。然而，在實(shí)際使用中，預(yù)應(yīng)力混凝土箱形梁橋的裂縫開展是比較普遍的，特別是翼板與腹板交界處和錨固區(qū)，已經(jīng)嚴(yán)重影響箱形梁橋的安全性和耐久性。針對這一比較嚴(yán)重的問題，本文從局部應(yīng)力的角度出發(fā)，，通過有限元分析，進(jìn)行了如下研究： 首先介紹了箱形梁的優(yōu)缺點(diǎn)，箱形梁的出現(xiàn)和發(fā)展；闡述了箱形梁因?yàn)榫植繎?yīng)力引起的病害以及各局部應(yīng)力的研究現(xiàn)狀。 然后分析了箱形梁的受力特點(diǎn)，介紹了箱梁局部應(yīng)力的計(jì)算方法；介紹了混凝土局部承壓的受力狀態(tài)以及規(guī)范中關(guān)于局部承壓區(qū)的驗(yàn)算規(guī)定。 為了分析箱梁主梁根部截面局部應(yīng)力，運(yùn)用有限元分析軟件Midas FEA，建立某三跨預(yù)應(yīng)力混凝土連續(xù)梁橋的0、1號塊空間實(shí)體有限元模型，分別分析了此橋在成橋運(yùn)營狀態(tài)下和施工最大懸臂狀態(tài)主梁根部截面的局部應(yīng)力大小和分布規(guī)律。并與用有限元軟件Midas Civil所建立的桿系有限元模型計(jì)算結(jié)果進(jìn)行了對比分析。 最后對于錨固區(qū)局部應(yīng)力的分布規(guī)律，針對預(yù)應(yīng)力混凝土箱形梁橋中典型的錨固區(qū)位置，根據(jù)我國JTG D62-2004規(guī)范對局部承壓區(qū)的驗(yàn)算規(guī)定，分別對腹板錨固區(qū)、齒板錨固區(qū)、端部群錨區(qū)進(jìn)行了實(shí)體有限元分析，搞清了這些錨固區(qū)應(yīng)力的大小以及分布規(guī)律，并對其原因進(jìn)行了闡述。
[Abstract]:At present, many bridges are constructed with prestressed concrete box beam. However, in practical use, the crack development of prestressed concrete box girder bridge is quite common, especially at the junction of flange and web plate and anchoring area. The safety and durability of box girder bridge have been seriously affected. In view of this serious problem, this paper, from the point of view of local stress, through finite element analysis, has carried out the following research: Firstly, the advantages and disadvantages of box beam, the appearance and development of box beam are introduced, and the disease caused by local stress of box beam and the research status of each local stress are expounded. Then, the stress characteristics of box beam are analyzed, the calculation method of local stress of box girder is introduced, the stress state of concrete local bearing pressure and the checking calculation rules of local bearing zone in code are introduced. In order to analyze the local stress of the root section of the box girder, the finite element model of a three-span prestressed concrete continuous beam bridge is established by using the finite element analysis software Midas fea. The local stress size and distribution of the root section of the main beam under the operation condition of the bridge and the maximum cantilever state in construction are analyzed respectively. The results are compared with that of the finite element software Midas. The calculation results of the finite element model of the bar system established by Civil are compared and analyzed. Finally, for the distribution law of local stress in anchoring area, according to the JTG D62-2004 code of our country, according to the typical Anchorage zone location of prestressed concrete box girder bridge, the local pressure zone is checked and calculated. The finite element analysis of the web Anchorage zone, the tooth plate Anchorage area and the end group Anchorage area is carried out, and the magnitude and distribution of the stress in these Anchorage zones are clarified, and the reasons are expounded.
【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

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊轉(zhuǎn)運(yùn);張亮亮;劉會(huì);;薄壁箱梁大噸位預(yù)壓力錨固區(qū)局部承壓[J];重慶大學(xué)學(xué)報(bào)(自然科學(xué)版);2007年06期

2 張向群;林波;劉釗;;預(yù)應(yīng)力梁橋齒板錨固區(qū)配筋設(shè)計(jì)新方法[J];中國工程科學(xué);2010年04期

3 楊高中,楊征宇,周軍生,李強(qiáng),宋貴峰;連續(xù)剛構(gòu)橋在我國的應(yīng)用和發(fā)展[J];公路;1998年06期

4 陳忠炎;預(yù)應(yīng)力混凝土箱梁橋局部錨固應(yīng)力[J];國外公路;1994年06期

5 馬s

本文編號：1451170