本文選題：混凝土彎箱梁橋　切入點(diǎn)：地震　出處：《長(zhǎng)安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：關(guān)于混凝土彎梁橋、箱梁的理論分析、設(shè)計(jì)、施工的研究已經(jīng)很多成果，但是在關(guān)于混凝土彎箱梁橋這種相對(duì)新穎的橋梁研究方面成果卻較少，特別是對(duì)于地震后混凝土彎箱梁橋的研究成果更少，因此研究地震后混凝土彎箱梁橋不但可以完善橋梁結(jié)構(gòu)設(shè)計(jì)理論，還可以豐富橋梁結(jié)構(gòu)類型，促進(jìn)混凝土彎箱梁橋的推廣應(yīng)用，實(shí)現(xiàn)橋梁結(jié)構(gòu)的健康持續(xù)發(fā)展，具有重要的意義。 本文以西安某震后彎橋?yàn)楣こ桃劳校紫葘?duì)橋梁震后的病害展開(kāi)全面系統(tǒng)的檢查分析，通過(guò)對(duì)橋梁病害的檢查結(jié)果，簡(jiǎn)單推斷出引起此次橋梁病害的可能原因；然后采用有限元軟件MIDAS/CIVAL對(duì)該橋梁病害產(chǎn)生的幾種因素在兩種模型下展開(kāi)了數(shù)值分析，對(duì)混凝土彎箱梁橋在結(jié)構(gòu)恒載作用下、預(yù)應(yīng)力效應(yīng)、溫度作用、不同地震等級(jí)、最不利荷載組合等幾種工況展開(kāi)了系統(tǒng)分析，，得出了混凝土彎箱梁橋在這幾種情況下的內(nèi)力分布情況以及支座的約束反力、偏移。 綜合混凝土彎箱梁橋外觀病害檢查的初步判斷結(jié)果和橋梁有限元軟件的數(shù)值分析結(jié)果，對(duì)橋梁的病害原因展開(kāi)系統(tǒng)全面的分析，得出如下結(jié)論： （1）通過(guò)數(shù)值分析可以看出：兩種混凝土彎箱橋橋梁模型下的橋梁內(nèi)力分布表現(xiàn)出混凝土彎梁橋典型的彎扭耦合效應(yīng)； （2）溫度升高造成曲線梁端部橫向力不斷增大，邊墩限位裝置承載力較弱，對(duì)于曲線梁橋，極易在溫度及其他荷載作用下，引起橫向限位裝置損壞； （3）根據(jù)數(shù)值分析結(jié)果可以看出：地震中的橫橋向的地震力和縱橋向的地震力對(duì)限位支座影響不大；通過(guò)5種最不利荷載效應(yīng)組合結(jié)果可知，即使在橋梁不計(jì)預(yù)應(yīng)力效應(yīng)的正常使用狀態(tài)下，6#支座承受的橫向力也不小于907kN，這個(gè)數(shù)值已經(jīng)遠(yuǎn)遠(yuǎn)大于其所承載的橫向力極值230kN，所以，在地震過(guò)程中邊墩的支座很容易遭到破壞； （4）依據(jù)該混凝土彎箱梁橋兩種有限元數(shù)值模型內(nèi)力及支座相應(yīng)的分析與評(píng)價(jià)，確定引起橋梁病害的主要原因?yàn)榈卣鹱饔眉皟?nèi)力累積綜合效應(yīng)、支座限位裝置較弱以及下部結(jié)構(gòu)設(shè)計(jì)不合理。 在得出橋梁病害原因的基礎(chǔ)上提出了該橋梁維修加固的建議和維修加固的主要內(nèi)容；最后對(duì)橋梁成功的進(jìn)行了維修加固過(guò)程中的加固監(jiān)控。
[Abstract]:A concrete curved girder bridge, box girder analysis, design theory, construction research has many achievements, but on the results of bridge of concrete curved box girder bridge is the relatively new but less, especially for the research results after the earthquake of concrete curved box girder bridge is less, so the study of Concrete Curved Box Girder Bridges after the earthquake not only can improve the structure of the bridge design theory, but also enrich the bridge structure type, promote the popularization and application of concrete curved box girder bridge, bridge structure health and sustainable development, has important significance.
This paper takes the Xi'an earthquake curved bridge, on the bridge after the earthquake damage analysis firstly systematically check, through the bridge disease inspection results, simply infer possible causes of the disease of the bridge; and then by several factors of finite element software MIDAS/CIVAL on the bridge under the two models launched numerical analysis of concrete curved box girder bridge structure under dead load, prestressing effect, temperature effect, different earthquake levels, the most unfavorable load operating conditions are analyzed, the concrete curved box girder bridges in these cases, the distribution of internal force and the bearing constraint force, offset.
A comprehensive analysis of the causes of bridge diseases is made based on the preliminary judgement results of the concrete disease inspection and the numerical analysis results of the bridge finite element software.
(1) through numerical analysis, it can be seen that the internal force distribution of two kinds of concrete curved box bridge models shows typical bending torsional coupling effects of concrete curved girder bridges.
(2) the transverse force at the end of the curved beam increases with the increase of temperature, and the bearing capacity of the side pier limiting device is weak. For curved girder bridges, it is easy to damage the lateral limiting devices under the action of temperature and other loads.
(3) according to the results of numerical analysis show that cross bridge in the earthquake to the seismic force and longitudinal seismic force on the limit bearing little effect; by 5 of the most disadvantageous load effect combination results, even in the bridge regardless of prestressing effect under normal use, 6# support withstand lateral forces also not less than 907kN, this value has been far greater than the extreme value of 230kN, so the lateral force, bearing pier are vulnerable to damage during the earthquake;
(4) according to the analysis and evaluation of the internal force and support of the two finite element numerical models of the concrete curved box girder bridge, the main cause of the bridge damage is the comprehensive effect of earthquake action and internal force accumulation. The supporting device is weak and the design of the substructure is unreasonable.
On the basis of obtaining the causes of bridge diseases, the suggestions for bridge maintenance and reinforcement and the main contents of maintenance and reinforcement are put forward. Finally, the reinforcement monitoring of the bridge is carried out during the maintenance and reinforcement process.

【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)】：U445.7

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