本文選題：單塔單跨懸索橋 + 鋼桁加勁梁��； 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：在我國(guó)已建成的懸索橋中,采用單塔單跨鋼桁梁這種結(jié)構(gòu)形式的較少,這種結(jié)構(gòu)的施工監(jiān)控經(jīng)驗(yàn)更是不足。本文依托主跨為256米的西藏通麥特大橋,開展了單塔單跨鋼桁梁懸索橋施工監(jiān)控方面的計(jì)算分析和現(xiàn)場(chǎng)監(jiān)控。取得了如下的主要成果:①應(yīng)用有限元軟件midas civil,考慮單塔單跨鋼桁梁的結(jié)構(gòu)特點(diǎn),建立了通麥大橋的空間有限元模型。通過(guò)一次成橋的初始平衡狀態(tài)分析試算,得到了可靠的有限元模型。②進(jìn)行通麥特大橋的初始平衡狀態(tài)分析,給出了主纜在空纜狀態(tài)及成橋狀態(tài)的線形,以及主纜及吊桿的無(wú)應(yīng)力長(zhǎng)度。通過(guò)與設(shè)計(jì)文件進(jìn)行比對(duì),說(shuō)明了計(jì)算模型及計(jì)算結(jié)果的正確性。③對(duì)影響主纜線形的因素進(jìn)行了計(jì)算,分析了跨度變化、溫度變化對(duì)主跨主纜跨中標(biāo)高的影響。通過(guò)主纜架設(shè)施工監(jiān)控,通麥大橋主纜線形良好,誤差滿足規(guī)范要求。④通過(guò)對(duì)施工條件、鋼桁梁架設(shè)順序、橋面板鋪裝順序、鋼桁梁連接方式等的計(jì)算分析和綜合研究,提出了從梁端開始吊裝鋼桁加勁梁節(jié)段直至B6節(jié)段處合攏、從跨中開始往兩端對(duì)稱鋪裝橋面板、采用分段剛接法的鋼桁梁連接方式。經(jīng)過(guò)主纜線形、吊桿索力、鋼桁梁應(yīng)力和標(biāo)高等監(jiān)測(cè)數(shù)據(jù)分析,驗(yàn)證了上述鋼桁梁和橋面板施工順序的合理性。⑤根據(jù)通麥特大橋的施工全過(guò)程計(jì)算分析得出的主索鞍預(yù)偏量,擬定了主索鞍分六次頂推施工的方案。通過(guò)將每一頂推階段的實(shí)際頂推量與擬定頂推量對(duì)比分析,證明了擬定的主索鞍頂推方案的正確性。
[Abstract]:In the suspension bridges built in our country, the single tower and single span steel truss beam is used less, and the construction monitoring experience of this kind of structure is even less. Based on the 256m main span of Tongmai Bridge in Tibet, this paper carries out the calculation, analysis and on-site monitoring of construction monitoring of single-tower and single-span steel truss suspension bridge. The main achievements of this paper are as follows: 1. The spatial finite element model of Tongmai Bridge is established by using the finite element software midas civil and considering the structural characteristics of single tower and single span steel truss beam. By analyzing the initial equilibrium state of the bridge at one time, a reliable finite element model .2 is obtained for the initial equilibrium state analysis of the Tongmai Bridge, and the alignment of the main cable in the state of the aerial cable and the state of the bridge is given. And the stress-free length of the main cable and boom. By comparing with the design file, the correctness of the calculation model and the result of calculation is given to calculate the factors affecting the main cable shape, and the influence of the change of span and temperature on the winning height of the main cable span is analyzed. Through monitoring and controlling the construction of main cable erection, the main cable of Tongmai Bridge is in good shape, and the error meets the requirements of code .4 through the calculation, analysis and comprehensive study of the construction conditions, the erection order of steel truss beam, the paving sequence of deck slab, the connection mode of steel truss beam, etc. It is proposed that the steel truss beam should be hoisted from the end of the beam to the B6 section, and the bridge deck should be laid symmetrically at both ends from the middle of the span, and the steel truss beam should be connected by the method of section rigid connection. Through the analysis of main cable shape, cable force of suspender, stress and elevation of steel truss beam, the rationality of the construction sequence of the steel truss beam and deck slab is verified. 5. According to the calculation and analysis of the whole construction process of Tongmai Bridge, the pre-deflection of the main cable saddle is verified. The scheme of main cable saddle construction is worked out in six times. The correctness of the proposed scheme is proved by comparing the actual push amount of each push stage with the proposed one.
【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】：2015
【分類號(hào)】：U445.4

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本文編號(hào)：1995073