本文選題：混合梁斜拉橋 + 鋼-混結(jié)合段��； 參考：《湖南大學(xué)》2014年碩士論文

【摘要】：混合梁斜拉橋邊跨采用混凝土主梁，主跨采用鋼主梁，兩種主梁在橋塔附近通過鋼-混結(jié)合段進行連接轉(zhuǎn)換。混合梁斜拉橋邊主跨主梁采用不同材料，同時鋼-混結(jié)合段作為混合梁斜拉橋的關(guān)鍵部位，，其構(gòu)造形式和力學(xué)特性也比較復(fù)雜，導(dǎo)致混合梁斜拉橋設(shè)計與施工時將面臨新的問題。因此，工程技術(shù)人員和科研人員需要對混合梁斜拉橋力學(xué)性能與施工控制進行研究。 混合梁斜拉橋大都采用雙塔、空間索面、半漂浮體系，主跨鋼箱梁在懸拼施工時通常把一個索距長度的鋼箱梁作為一個節(jié)段整體進行拼裝，而本文研究的斜拉橋采用的是獨塔、單索面、塔梁墩固結(jié)體系，主梁在懸拼施工時，一個索距內(nèi)的鋼箱梁節(jié)段將分為兩段先后吊裝施工。大跨、獨塔、單索面、寬箱等特點將使鋼-混結(jié)合段在成橋運營時承受較大扭矩，主跨鋼箱梁分段吊裝施工將使拼裝過程變得復(fù)雜。 本文以云南省六庫怒江二橋為工程背景，對獨塔單索面混合梁斜拉橋力學(xué)性能和施工控制關(guān)鍵技術(shù)進行了研究，主要內(nèi)容有： （1）建立怒江二橋的MIDAS有限元模型，研究其力學(xué)特點； （2）根據(jù)工程實際，研究優(yōu)化施工過程及對應(yīng)安裝索力的方法及最優(yōu)施工方案； （3）研究混合梁斜拉橋的施工控制時的關(guān)鍵參數(shù)，和主跨鋼箱梁分段吊裝的施工控制方法； （4）建立鋼混結(jié)合段ANSYS有限元模型，研究其受力機理； 得出的主要結(jié)論有： （1）獨塔單索面混合梁斜拉橋宜采用塔梁墩固結(jié)體系； （2）獨塔單索面混合梁斜拉橋鋼-混結(jié)合段構(gòu)造可以簡化； （3）混合梁斜拉橋主跨鋼箱梁懸臂吊裝施工過程可用本文提出的方法優(yōu)化； （4）斜拉橋施工應(yīng)嚴(yán)格根據(jù)計算得出的無應(yīng)力索長、預(yù)制線形和安裝線形進行控制； （5）鋼-混結(jié)合段抗扭性能良好，其中鋼板承擔(dān)20～30%扭矩，格式內(nèi)RPC承擔(dān)70～80%扭矩， （6）扭矩作用下塔梁墩固結(jié)體系的混合梁斜拉橋鋼-混結(jié)合段產(chǎn)生空間分布的翹曲正應(yīng)力，使得鋼板和RPC的最大正壓應(yīng)力較壓彎時增加30%。
[Abstract]:The main span of the hybrid beam cable-stayed bridge is the concrete main beam, the main span is the steel main beam and the two main beams are connected and converted by the steel mixing section near the bridge tower. The main beam of the mixed girder cable-stayed bridge is different material, and the steel mixing section is the key part of the mixed beam cable-stayed bridge, its structure form and mechanical characteristics are complex. The design and construction of the mixed beam cable-stayed bridge will face new problems. Therefore, the engineers and researchers need to study the mechanical performance and construction control of the mixed girder cable-stayed bridge.
The mixed girder cable-stayed bridge mostly uses Twin Towers, space cable surface and semi floating system. The steel box girder of the main span steel box girder is usually assembled as a segment as a whole, while the main span steel box girder is used as a segment as a whole, while the cable-stayed bridge used in this paper is a single tower, single cable surface, a tower beam pier solid knot system, and the main beam in the suspension construction, the steel inside a cable distance steel. The section of box girder will be divided into two stages of lifting construction. Large span, single tower, single cable surface, wide box and other special points will make the steel mixing section bear greater torque during the bridge operation, and the subsection hoisting construction of the main span steel box girder will make the assembling process become complicated.
In this paper, taking the second bridge of the six Treasury Nu River in Yunnan as the project background, the key technology of the mechanical performance and construction control of the single tower single cable plane mixed beam cable-stayed bridge is studied. The main contents are as follows:
(1) establish the MIDAS finite element model of the second bridge of Nu River and study its mechanical characteristics.
(2) according to the actual situation of the project, the optimization of the construction process and the method of installing the cable force and the optimal construction plan are studied.
(3) the key parameters in the construction control of the hybrid girder cable-stayed bridge and the construction control method of the main span steel box girder hoisting are studied.
(4) establish the ANSYS finite element model of the steel-concrete joint section and study its stress mechanism.
The main conclusions are as follows:
(1) tower girder pier consolidation system should be adopted for single tower single cable plane hybrid girder cable stayed bridge.
(2) the construction of steel concrete mixing section of single tower and single cable plane hybrid girder cable-stayed bridge can be simplified.
(3) the cantilever hoisting process of the main span steel box girder of the hybrid girder cable-stayed bridge can be optimized by the method proposed in this paper.
(4) the construction of cable-stayed bridges should be strictly controlled according to the calculated length of unstressed cables, precast alignment and installation alignment.
(5) the steel and concrete combination section has good torsional performance, of which the steel plate bears 20 to 30% torque, and the RPC takes 70 to 80% torque.
(6) the steel mixing section of the mixed beam cable-stayed bridge under the torque action of the tower girder pier produces the warping positive stress in the space distribution, which makes the maximum positive pressure of the steel plate and RPC increase by 30%..
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.27

【參考文獻】

相關(guān)期刊論文 前10條

1 聶建國,陳必磊,肖建春;已知索端預(yù)張力或預(yù)應(yīng)力狀態(tài)索長的索原長求解技術(shù)[J];工程力學(xué);2003年06期

2 趙文武;辛克貴;;預(yù)應(yīng)力混凝土斜拉橋自適應(yīng)施工控制分析[J];工程力學(xué);2006年02期

3 顏東煌,文鈺,劉光棟,易偉建;斜拉橋的施工最優(yōu)控制[J];國外公路;1999年03期

4 張曉殼,陳寧,王應(yīng)良,鄭凱鋒;斜拉橋的數(shù)學(xué)建模[J];國外橋梁;1998年02期

5 方志,劉光棟,王光炯;斜拉橋施工的灰色預(yù)測控制系統(tǒng)[J];湖南大學(xué)學(xué)報(自然科學(xué)版);1997年03期

6 丁遂棟;組合梁橫截面上正應(yīng)力計算的折算系數(shù)法[J];力學(xué)與實踐;1986年06期

7 方志;李學(xué)有;;斜拉索無應(yīng)力長度求解及成品索長合理確定[J];橋梁建設(shè);2009年04期

8 林元培;卡爾曼濾波法在斜拉橋施工中的應(yīng)用[J];土木工程學(xué)報;1983年03期

9 鐘萬勰,劉元芳,紀(jì)崢;斜拉橋施工中的張拉控制和索力調(diào)整[J];土木工程學(xué)報;1992年03期

10 梁鵬;肖汝誠;徐岳;;超大跨度斜拉橋的安裝構(gòu)形與無應(yīng)力構(gòu)形[J];長安大學(xué)學(xué)報(自然科學(xué)版);2006年04期

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