【摘要】：武漢某跨鐵路斜拉橋跨徑260m，橋面為從標(biāo)準(zhǔn)寬度39.0m漸變至49.899m，最大懸澆節(jié)段重達(dá)903.1t，設(shè)計承載能力1000t設(shè)計，這樣超寬橋面、長節(jié)段、重量大的橋型設(shè)計給施工提出了嚴(yán)峻的考驗，在目前已建成及在建的橋梁中，類似的橋梁比較稀少。由于無論是后支點掛籃還是牽索掛籃均難以獨自完成超寬橋面、千噸位、雙索面斜拉橋主梁懸澆施工的技術(shù)難題。因此進(jìn)行超寬變截面橋面懸臂施工及仿真計算研究，具有重要的理論價值和工程應(yīng)用意義。主要工作與結(jié)論如下： 1、本文提出將牽索掛籃和后支點三角掛籃綜合使用的復(fù)合牽索三角掛籃結(jié)構(gòu)體系，構(gòu)思新穎，利用后支點掛籃的橫向穩(wěn)定性和牽索掛籃的輕盈性，綜合了后支點掛籃和牽索掛籃施工工藝特點，充分發(fā)揮二者優(yōu)勢，以嘗試新的懸澆施工技術(shù)。 2、復(fù)合牽索三角掛籃可實現(xiàn)變寬度橋梁施工。通過增設(shè)一片或若干片桁架，調(diào)整兩片桁架之間的聯(lián)結(jié)系，即調(diào)整橫梁的跨度，可實現(xiàn)變寬度橋梁施工。 3、根據(jù)設(shè)計的施工圖紙，運用大型有限元分析軟件Midas/civil2012建立三維空間有限元分析模型，，利用未知荷載系數(shù)功能求得斜拉橋合理成橋狀態(tài)斜拉索索力。采用正裝法對施工工程進(jìn)行計算分析，求得施工階段斜拉索索力，確定合理的施工狀態(tài)。 4、本文選擇最大懸臂澆筑施工階段進(jìn)行分析、驗算，通過斜拉橋的索力、撓度、主梁彎矩、主塔縱向偏位計算結(jié)果分析，懸臂澆筑施工過程中是滿足規(guī)范要求。求得的施工階段索力與合理成橋索力相差較小，斜拉橋仿真建模計算是準(zhǔn)確的，能滿足工程應(yīng)用要求，為同類型橋梁的設(shè)計、施工提供借鑒作用。
[Abstract]:The span of a cable-stayed bridge over Wuhan railway is 260 m, the deck is gradually changed from 39.0m to 49.899m in standard width, the maximum suspended section weight is 903.1t, and the design bearing capacity is 1000t. The design of super-wide deck, long section and large weight bridge provides a severe test for the construction. Among the bridges that have been built and are under construction, similar bridges are rare. It is difficult for both the rear fulcrum hanging basket and the pulling cable hanging basket to complete the construction of super wide bridge deck, thousand tons, double cable plane cable-stayed bridge girder suspension casting alone. Therefore, it has important theoretical value and engineering application significance to study the cantilever construction and simulation calculation of super wide and variable cross-section bridge deck. The main work and conclusions are as follows: 1. This paper puts forward a new structure system of the composite triangulation hanging basket, which is used in the combination of the pulling cable hanging basket and the rear fulcrum triangle hanging basket. Based on the lateral stability of the rear fulcrum and the lightness of the cable hanging basket, this paper synthesizes the construction technology characteristics of the rear fulcrum hanging basket and the pulling cable hanging basket, and gives full play to the advantages of the two methods. In order to try the new construction technology of suspension casting. 2, the construction of bridge with variable width can be realized by the triangle hanging basket of compound pull cable. By adding one or more pieces of trusses and adjusting the coupling between the two trusses, that is, adjusting the span of the crossbeam, the construction of the bridge with variable width can be realized. The three-dimensional spatial finite element analysis model is established by using the large-scale finite element analysis software Midas/civil2012, and the rational cable-stayed cable force in the state of cable-stayed bridge is obtained by using the function of unknown load coefficient. In this paper, the cable force of the cable-stayed bridge in the construction stage is calculated and analyzed by means of the formal installation method, and the reasonable construction state is determined. 4. In this paper, the maximum cantilever construction stage is selected for analysis, checking calculation, and through the cable force of the cable-stayed bridge, the cable force of the cable-stayed bridge is obtained. Deflection, bending moment of main beam, longitudinal deflection of main tower analysis, cantilever construction process is to meet the requirements of the code. The difference between the cable force obtained in construction stage and the reasonable cable force is relatively small. The simulation modeling and calculation of cable-stayed bridge is accurate, which can meet the requirements of engineering application and provide reference for the design and construction of the same type of bridge.
【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.4

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