本文選題：斜拉橋 + 換索方案　； 參考：《浙江大學》2014年碩士論文

【摘要】：斜拉索作為斜拉橋最主要受力構(gòu)件之一,常常因為工作環(huán)境惡劣、受力狀態(tài)不合理及運營管理不善等原因,容易導致PE套管破裂腐蝕、鋼絞線(或鋼絲)銹蝕嚴重甚至拉索突然斷裂等病害,導致拉索承載能力降低,嚴重威脅著斜拉橋的安全使用。為了對損壞的斜拉索進行修復并恢復橋梁承載能力,國內(nèi)外紛紛對此類斜拉橋采取了斜拉索更換措施。但目前換索施工的理論研究遠遠滯后于工程實際,為此,本文以上虞市人民大橋換索工程為背景,選擇斜拉橋換索過程中的關(guān)鍵問題進行了研究,研究內(nèi)容如下： (1)在恢復斜拉橋換索前成橋狀態(tài)的基礎(chǔ)上,分別建立了逐根換索、正對稱更換2根拉索和反對稱更換2根拉索三種典型的獨塔斜拉橋拉索更換方案的有限元模型,通過比較三種換索方案下的斜拉索索力增量、橋面線形、主梁應變等橋梁受力指標變化量得到了更優(yōu)的換索方案,即正對稱更換2根斜拉索；然后通過比較換索施工階段主梁彎曲應變能的大小,得到了更優(yōu)的換索施工順序,即從短索向長索更換斜拉索。 (2)把阻尼減震器對拉索振動的影響考慮到拉索體系振動微分方程中,通過有效模擬阻尼減震塊的力學特性,建立了考慮阻尼器影響的斜拉索的振動能量方程,推導出了拉索索力與其自振頻率的關(guān)系,即索力計算公式；把該公式應用到人民大橋斜拉索索力計算結(jié)果表明,新公式比傳統(tǒng)公式計算誤差更小,更能滿足實際工程的精度要求。 (3)通過比較各國關(guān)于溫度荷載的計算規(guī)范,選擇出了合適于人民大橋的溫度計算模式,用有限元軟件MIDAS/Civil對人民大橋進行了溫度效應分析,結(jié)果表明體系溫差和橋塔溫度梯度對橋梁內(nèi)力影響較小,而索梁(塔)溫差和主梁溫度梯度對橋梁內(nèi)力影響較大；同時提出了在換索施工監(jiān)控時溫度對索力監(jiān)測、主梁應力監(jiān)測影響的初步修正建議。
[Abstract]:As one of the main stress components of cable-stayed bridge, the cable often leads to the rupture and corrosion of PE casing because of the bad working environment, unreasonable stress condition and poor operation management, etc. The serious corrosion of steel strands (or wires) and even the sudden breakage of cables lead to the reduction of cable bearing capacity, which seriously threaten the safe use of cable-stayed bridges. In order to repair the damaged cable-stayed cables and restore the bearing capacity of the bridges, the cable-stayed bridges have been replaced one after another at home and abroad. However, the theoretical study of cable replacement construction lags far behind the engineering practice. In this paper, the key problems in cable replacement process of cable-stayed bridge are studied based on the cable changing project of Shangyu people's Bridge. The research contents are as follows: 1) on the basis of restoring the state of the cable-stayed bridge before cable replacement, the finite element models of three typical cable-stayed bridge cable replacement schemes, one by one, two cables symmetrically and two cables are established, respectively. By comparing the force increment of cable-stayed cable, the line shape of bridge deck and the strain of main beam, the better scheme of cable exchange is obtained, that is, two cable-stayed cables are replaced symmetrically. Then by comparing the bending strain energy of the main beam in the stage of cable replacement construction, a better sequence of cable exchange construction is obtained, that is, replacing the stay cable from short cable to long cable. (2) the effect of damping damper on cable vibration is taken into account in the vibration differential equation of cable system. By effectively simulating the mechanical characteristics of damping damper, the vibration energy equation of stay cable considering the influence of damper is established. The relation between cable force and its natural vibration frequency is derived, that is, the formula of cable force, which is applied to the calculation of cable force of people's Bridge, shows that the new formula has less error than the traditional formula. More can meet the actual engineering accuracy requirements. 3) by comparing the calculation codes of temperature loads in different countries, the temperature calculation model suitable for the people's Bridge is selected, and the temperature effect of the people's Bridge is analyzed by using the finite element software MIDAS/Civil. The results show that the temperature difference of the system and the temperature gradient of the bridge tower have little influence on the internal force of the bridge, while the temperature difference of the cable beam (tower) and the temperature gradient of the main beam have great influence on the internal force of the bridge. The preliminary correction suggestion of the influence of the main beam stress monitoring.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.27;U445.4

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