本文選題：黃艤長(zhǎng)江大橋 + 施工�。� 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：大跨度斜拉橋的施工監(jiān)控過(guò)程是一項(xiàng)非常復(fù)雜的工作,其施工監(jiān)控的分析研究已成為許多橋梁工程師及橋梁研究者們共同關(guān)注和重視的一個(gè)重要課題,本文所依托的黃艤長(zhǎng)江大橋?yàn)楦叩退旌狭盒崩瓨?非傳統(tǒng)的等高塔斜拉橋,該橋合龍段在靠近矮塔一側(cè)而非橋梁中部,而且主跨設(shè)計(jì)采用鋼箱梁,所以合龍段兩端的標(biāo)高控制以及合龍段長(zhǎng)度的確定都變得異常復(fù)雜。斜拉橋是高次超靜定結(jié)構(gòu),其施工方法和安裝順序與成橋后的主梁線性和結(jié)構(gòu)內(nèi)力有密切的關(guān)系。斜拉橋施工過(guò)程中要對(duì)索力進(jìn)行調(diào)整,這將引起主梁內(nèi)力和主塔等施工控制參數(shù)的理論計(jì)算值發(fā)生變化,斜拉橋施工程序也明確規(guī)定,為了確保施工過(guò)程的安全以及成橋線形滿足設(shè)計(jì)要求、成橋后的應(yīng)力在允許范圍內(nèi),必須在斜拉橋施工過(guò)程中加以有效的監(jiān)控管理。本文首先介紹了斜拉橋和高低塔斜拉橋國(guó)內(nèi)外的發(fā)展概況及發(fā)展前景。其次對(duì)本文工程背景和本文的研究目標(biāo)也進(jìn)行敘述,突出了該橋施工監(jiān)控的重點(diǎn)及難點(diǎn),緊接著介紹了如何采用正裝計(jì)算法對(duì)大橋?qū)嶋H施工過(guò)程進(jìn)行模擬計(jì)算,結(jié)合實(shí)際的施工過(guò)程,對(duì)鋼箱梁梁段和斜拉索的下料及安裝提供技術(shù)數(shù)據(jù)。然后以黃艤長(zhǎng)江大橋?yàn)槔?為保證黃艤長(zhǎng)江大橋成橋后內(nèi)力和線形滿足設(shè)計(jì)要求,本文研究如何通過(guò)采用實(shí)地測(cè)量與有限元方法理論計(jì)算相結(jié)合的方法,首先對(duì)鋼箱梁節(jié)段安裝進(jìn)行高程預(yù)測(cè),再通過(guò)調(diào)整拉索索力對(duì)偏差進(jìn)行調(diào)整,使橋梁主梁的標(biāo)高控制在或接近設(shè)計(jì)標(biāo)高。同時(shí)介紹如何借助先進(jìn)的測(cè)試儀器,通過(guò)預(yù)埋傳感器,對(duì)實(shí)體結(jié)構(gòu)進(jìn)行測(cè)試,掌握其實(shí)體結(jié)構(gòu)的真實(shí)應(yīng)力,再通過(guò)對(duì)結(jié)構(gòu)應(yīng)力分析,找出拉應(yīng)力超出允許值范圍的有關(guān)點(diǎn)位,對(duì)其采取加強(qiáng)措施,防止發(fā)生開(kāi)裂現(xiàn)象。其次,本章還闡述通過(guò)對(duì)斜拉索的索力進(jìn)行進(jìn)行實(shí)時(shí)監(jiān)測(cè),保證了拉索在最不利工況下的內(nèi)力能滿足使用要求的方法。本章最后通過(guò)對(duì)主梁實(shí)測(cè)標(biāo)高、主塔實(shí)際偏位、斜拉索實(shí)際索力和各關(guān)鍵截面與理論計(jì)算值及規(guī)范要求值進(jìn)行比較,所得結(jié)果均滿足要求,印證了所采取的監(jiān)控方法行之有效,具有可操作性。
[Abstract]:The construction monitoring process of long-span cable-stayed bridge is a very complicated work. The analysis and research of construction monitoring has become an important issue that many bridge engineers and bridge researchers pay attention to.The Huangyue Yangtze River Bridge supported in this paper is a hybrid girder cable-stayed bridge with high and low towers and a non-traditional cable-stayed bridge with equal tower. The closure section of the bridge is near the side of the low tower rather than the middle of the bridge, and the main span is designed with steel box girder.Therefore, the elevation control at both ends of the closure segment and the determination of the length of the closure section become extremely complicated.The cable-stayed bridge is a high-order statically indeterminate structure. Its construction method and installation sequence are closely related to the linearity of the main beam and the internal force of the structure after the completion of the bridge.During the construction of cable-stayed bridge, the cable force should be adjusted, which will cause the change of the theoretical calculation value of the internal force of the main beam and the construction control parameters such as the main tower, and the construction procedure of the cable-stayed bridge is also clearly stipulated.In order to ensure the safety of the construction process and the alignment of the bridge to meet the design requirements, the stress after the completion of the bridge is within the allowable range and must be effectively monitored and managed during the construction of the cable-stayed bridge.This paper first introduces the development and prospects of cable-stayed bridges and cable-stayed bridges with high and low pylon at home and abroad.Secondly, the engineering background and research objectives of this paper are also described, highlighting the key points and difficulties of the bridge construction monitoring, and then introducing how to simulate and calculate the actual construction process of the bridge by using the formal calculation method.Combined with the actual construction process, the technical data are provided for the material and installation of the steel box girder section and the stay cable.Then taking the Huangyue Yangtze River Bridge as an example, in order to ensure that the internal force and the line shape of the Huangyue Yangtze River Bridge meet the design requirements, this paper studies how to combine the field measurement with the finite element method.The elevation of the steel box girder is forecasted at first, and then the deviation is adjusted by adjusting the cable force, so that the elevation of the main girder of the bridge is controlled at or close to the design elevation.At the same time, it introduces how to test the solid structure by means of advanced testing instruments, through embedded sensors, to master the real stress of the solid structure, and then through the analysis of the structural stress, to find out the relevant points where the tensile stress exceeds the allowable value range.Measures should be taken to prevent cracking.Secondly, this chapter also describes the method of real-time monitoring the cable force to ensure that the internal force of the cable can meet the requirements under the most unfavorable working conditions.Finally, by comparing the measured elevation of the main beam, the actual deviation of the main tower, the actual cable force of the stay cable and each key section with the theoretical calculation value and the required value of the code, the results obtained meet the requirements, which proves that the monitoring method adopted is effective.It is operable.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.4

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