本文選題：空間纜索　切入點：空間線形　出處：《西南交通大學(xué)》2017年碩士論文

【摘要】：空間纜索體系懸索橋是一種由主纜、吊索以及加勁梁組成的三維索體系橋梁,其造型優(yōu)美、受力合理,與同等規(guī)模的平面纜索體系懸索橋相比,空間纜索體系懸索橋在吊索內(nèi)力增加不多的情況下,橫向剛度顯著提高,橋梁抗風(fēng)性能明顯改善,是未來大跨度橋梁的一個發(fā)展方向。對其精細化分析是空間纜索體系懸索橋設(shè)計與施工的保障,本文為提高空間纜索體系懸索橋的精細化施工分析做了以下工作。利用懸鏈線索單元面內(nèi)切線剛度,通過求極限方法推導(dǎo)了索單元的面外剛度,建立了空間索單元剛度矩,并對該空間索單元剛度矩陣進行了適用范圍研究,對垂直吊索、無自重索等特殊索單元的剛度矩陣進行了推導(dǎo);探討了空間纜索系統(tǒng)懸索橋索鞍在空纜狀態(tài)與成橋狀態(tài)的平衡條件和索鞍參數(shù)設(shè)計的基本原則,利用18元方程組與牛頓迭代法求解了適用任意空間索鞍與主纜的豎向、橫向切點幾何信息;探討了空間散索鞍上索股在鞍槽內(nèi)的橫截面穩(wěn)定條件與三維空間穩(wěn)定條件,在穩(wěn)定的基礎(chǔ)上確定了空間散索鞍整體參數(shù)設(shè)計與鞍槽曲線的設(shè)計原則,在考慮索股張力在鞍槽內(nèi)存在摩擦損失的情況下推導(dǎo)了空間散索鞍的合力線的計算理論公式。以VS2015為開發(fā)平臺,利用C++編程語言結(jié)合上述理論推導(dǎo)編制了空間纜索體系懸索橋找形計算程序與空間散索鞍合理合力線計算程序,并與BNLAS計算結(jié)果對比,本文程序具有使用方便、計算精度高等特點。最后以Halogaland空間纜索懸索橋為研究對象,研究了貓道承重索的經(jīng)濟合理架設(shè)方案、確定了貓道抗風(fēng)索初始張力,研究了無應(yīng)力長度不變原理在該橋索股架設(shè)的應(yīng)用與實際索股架設(shè)控制技術(shù);研究了 5桿、7桿、9桿主纜橫向頂撐方案,實現(xiàn)了主纜平面線形到空間線形的平緩過渡,并分析了不同方案對主纜線形和撐桿內(nèi)力的影響;探討了從空纜平面線形到成橋空間線形主纜橫向轉(zhuǎn)動位移問題,并得出了主纜橫向總轉(zhuǎn)動位移由主纜整體幾何轉(zhuǎn)動位移與主纜截面扭轉(zhuǎn)變形兩部分組成的結(jié)論。通過Haloga1and主纜截面彎扭剛度對主纜截面扭轉(zhuǎn)變形影響的敏感性分析,認為Ha1oga1and橋主纜截面扭轉(zhuǎn)變形受主纜彎扭剛度影響較小,主纜索夾橫向預(yù)偏角主要來自主纜幾何扭轉(zhuǎn)位移部分;最后對HAlogaland吊梁過程進行了分析,各項指標(biāo)均經(jīng)濟合理。
[Abstract]:Space cable system suspension bridge is a three-dimensional cable system bridge composed of main cable, sling and stiffened beam. Its shape is beautiful and the force is reasonable, compared with the plane cable system suspension bridge of the same size. The lateral stiffness and wind-resistant performance of the space cable system suspension bridge are obviously improved when the internal force of the sling is not much increased. It is a development direction of long span bridge in the future. The detailed analysis is the guarantee of the design and construction of the suspension bridge with space cable system. In order to improve the fine construction analysis of space cable system suspension bridge, the following work is done in this paper. By using the tangent stiffness of catenary clue element, the out-of-plane stiffness of cable element is deduced by the limit method, and the stiffness moment of space cable element is established. The stiffness matrix of the space cable element is studied and the stiffness matrix of the special cable element such as vertical sling and no deadweight cable is deduced. In this paper, the equilibrium conditions of the saddle state and the cable saddle parameter design of the suspension bridge in space cable system are discussed. The vertical direction of the saddle and the main cable is solved by using the 18-element equations and Newton's iterative method. The geometric information of transverse tangent point, the stability condition of cross section and three dimensional space stability of the cable strands in the saddle groove are discussed, and the design principle of the integral parameter of the saddle and the curve of the saddle slot are determined on the basis of the stability. Considering the friction loss of cable strands tension in saddle grooves, a theoretical formula for calculating the resultant line of spacial loose saddle is derived. Using VS2015 as the development platform, the theoretical formula for calculating the resultant line of the saddle is derived. The program of shape finding for suspension bridge of space cable system and the calculation program of reasonable force line of space cable saddle are compiled by using C programming language combined with the above theoretical derivation. Compared with the calculation results of BNLAS, the program in this paper is convenient to use. Finally, taking the Halogaland space cable suspension bridge as the research object, the economic and reasonable erection scheme of the catwalk load bearing cable is studied, and the initial tension of the catwalk wind resistant cable is determined. The application of the principle of non-stress length invariance in the cable strands erection of the bridge and the control technology of the actual cable strands erection are studied, and the lateral jacking scheme of the main cable is studied, which realizes the smooth transition from the plane alignment of the main cable to the spatial alignment. The influence of different schemes on the main cable shape and the internal force of the brace is analyzed, and the lateral rotation displacement of the main cable from the plane line of the empty cable to the space line of the bridge is discussed. It is concluded that the total lateral rotational displacement of the main cable is composed of the overall geometric rotational displacement of the main cable and the torsional deformation of the main cable section. The sensitivity analysis of the influence of the bending and torsional stiffness of the Haloga1and main cable section on the torsional deformation of the main cable section is made. It is considered that the torsional deformation of the main cable section of the Ha1oga1and bridge is less affected by the bending and torsional stiffness of the main cable, and the transverse predeflection angle of the main cable clip mainly comes from the geometric torsional displacement part of the main cable, and finally, the process of the HAlogaland suspension beam is analyzed, and all the indexes are economical and reasonable.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U445.4;U448.25

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