【摘要】：合理成橋狀態(tài)及合理施工狀態(tài)是斜拉橋理論研究的重要課題，本文以河口大橋作為工程背景，研究了影響矩陣法在成橋索力優(yōu)化中的應(yīng)用，對(duì)采用無應(yīng)力狀態(tài)法進(jìn)行施工控制做了分析研究。 ①以虛位移原理和最小勢(shì)能原理為基礎(chǔ)研究了無應(yīng)力狀態(tài)法的控制理論，通過算例分析得出了分階段施工橋梁的平衡方程。根據(jù)無應(yīng)力狀態(tài)法的基本原理，推導(dǎo)出斜拉橋無應(yīng)力長(zhǎng)度差與索力變化一一對(duì)應(yīng)的關(guān)系，從理論角度驗(yàn)證了無應(yīng)力狀態(tài)法的嚴(yán)密性和可靠性。 ②研究了影響矩陣法在斜拉橋中的索力優(yōu)化原理，并且以河口大橋?yàn)楣こ瘫尘�，結(jié)合Midas/civil中以影響矩陣法為工作原理的未知荷載系數(shù)功能，計(jì)算成橋索力并進(jìn)行索力優(yōu)化，得到合理成橋狀態(tài)。分析得到了主梁位移約束條件下影響矩陣的規(guī)律及意義，并研究了影響值的計(jì)算方法。從索力優(yōu)化以后提取的主梁豎向位移、主塔順橋向位移、斜拉索索力等結(jié)果可以看出，用影響矩陣法進(jìn)行索力優(yōu)化是可行的，特別當(dāng)結(jié)合Midas/civil中的未知荷載系數(shù)功能時(shí)，，實(shí)現(xiàn)起來較為方便。 ③運(yùn)用了基于懸鏈線原理的斜拉索無應(yīng)力長(zhǎng)度的計(jì)算方法，用Excel迭代計(jì)算出無應(yīng)力索長(zhǎng)。建立河口大橋的施工階段模型，以斜拉索的無應(yīng)力長(zhǎng)度作為控制量進(jìn)行施工控制，確保在到位張拉時(shí)將斜拉索的無應(yīng)力長(zhǎng)度張拉至成橋目標(biāo)狀態(tài)下的無應(yīng)力長(zhǎng)度。對(duì)比正裝計(jì)算的成橋索力和成橋目標(biāo)狀態(tài)的斜拉索索力，可知由于混凝土收縮徐變因素使得二者存在差異，但通過迭代計(jì)算可以消除這種差異，驗(yàn)證了無應(yīng)力狀態(tài)法的正確性和可靠性。
[Abstract]:Reasonable completion state and reasonable construction state are important topics in the theoretical research of cable-stayed bridges. Taking Hekou Bridge as the engineering background, this paper studies the application of influence matrix method in the optimization of cable forces of completed bridges, and makes an analysis and Study on the construction control of non-stress state method.
(1) Based on the principle of virtual displacement and the principle of minimum potential energy, the control theory of the stress-free state method is studied, and the equilibrium equation of the bridge with staged construction is obtained through the analysis of an example. The tightness and reliability of stress state method.
(2) The optimum principle of cable forces in cable-stayed bridges by influence matrix method is studied. Taking Hekou Bridge as the engineering background and combining with the unknown load coefficient function of Midas/civil which takes influence matrix method as the working principle, the completed cable forces are calculated and the cable forces are optimized, and the reasonable completed state is obtained. From the results of vertical displacement of main girder, along-bridge displacement of main tower and cable force of cable stayed, it can be seen that the influence matrix method is feasible to optimize the cable force, especially when combined with the function of unknown load coefficient in Midas/civil. Then.
(3) Using the method of calculating the unstressed length of cable based on catenary principle, the unstressed length of cable is calculated by Excel iteration. The construction stage model of Hekou Bridge is established, and the unstressed length of cable is taken as the control quantity to control the construction, so as to ensure that the unstressed length of cable is stretched to the target shape of the bridge when the cable is in place. Comparing the cable tension of the finished bridge with the cable tension of the target state, it can be seen that there is a difference between them because of the shrinkage and creep of concrete, but the difference can be eliminated by iteration calculation, which verifies the correctness and reliability of the stress-free state method.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.27

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