本文選題：懸索橋　切入點(diǎn)：主纜線形控制　出處：《東南大學(xué)》2015年碩士論文

【摘要】：懸索橋施工控制的核心內(nèi)容是主纜線形、吊桿長(zhǎng)度及加勁梁標(biāo)高、索鞍預(yù)偏量設(shè)置等。本文以一座單跨730m鋼桁加勁梁懸索橋(云南金東大橋)為工程背景,進(jìn)行了施工控制關(guān)鍵技術(shù)研究,主要研究?jī)?nèi)容如下：(1)回顧了主纜材料與架設(shè)技術(shù)的演變以及主纜控制方法的發(fā)展,總結(jié)了懸索橋施工監(jiān)測(cè)與控制內(nèi)容及流程,給出了金東大橋的主纜線形測(cè)點(diǎn)布置鋼桁加勁梁線形及應(yīng)力監(jiān)測(cè)方案。(2)主纜是懸索橋施工控制的關(guān)鍵。在主纜分段懸鏈線計(jì)算中,結(jié)合既有研究推導(dǎo)了分段懸鏈線索段方程解析式及迭代遞推公式�？紤]索鞍對(duì)主纜端點(diǎn)幾何位置的影響,修正了既有主索鞍及散索鞍切點(diǎn)坐標(biāo)計(jì)算公式。完善了標(biāo)準(zhǔn)懸索幾何參數(shù)及內(nèi)力計(jì)算流程,并在此基礎(chǔ)上,推演了不同位置索股幾何特征參數(shù)的計(jì)算方法。根據(jù)本文算法,用C語(yǔ)言編制了成橋狀態(tài)主纜幾何參數(shù)的計(jì)算程序,并在MATLAB上運(yùn)行。本文程序計(jì)算結(jié)果與相關(guān)商業(yè)程序計(jì)算結(jié)果對(duì)比吻合較好。(3)結(jié)合金東大橋,給出了主纜、加勁梁、橋塔及成橋狀態(tài)的施工監(jiān)控內(nèi)容和關(guān)鍵參數(shù)的計(jì)算方法。(4)進(jìn)行了懸索橋成橋線形的影響參數(shù)誤差分析,分析結(jié)果表明,主纜彈性模量誤差及加勁梁恒載誤差對(duì)主纜無(wú)應(yīng)力長(zhǎng)度的影響比較顯著。如對(duì)金東大橋,當(dāng)彈性模量變化±5%時(shí),主纜無(wú)應(yīng)力長(zhǎng)度變化值達(dá)±157mm。若加勁梁恒載變化±5%時(shí),主纜無(wú)應(yīng)力長(zhǎng)度變化值達(dá)±135mm。但是可通過(guò)設(shè)置恰當(dāng)?shù)某善匪鞴慑^固拉桿調(diào)節(jié)長(zhǎng)度進(jìn)行調(diào)節(jié)。分析還表明,溫度對(duì)中跨主纜標(biāo)高影響較大,對(duì)本橋?yàn)?28mm/℃,而對(duì)邊跨主纜標(biāo)高的影響最大值約為-3 mm/℃。
[Abstract]:The key contents of construction control of suspension bridge are main cable shape, length of suspension rod and elevation of stiffened beam, setting of cable saddle pre-deflection and so on.Based on a single span 730m steel truss stiffened girder suspension bridge (Jindong Bridge in Yunnan Province), the key technology of construction control is studied in this paper.The main research contents are as follows: (1) reviewing the evolution of main cable material and erection technology and the development of main cable control method, summarizing the construction monitoring and control content and flow chart of suspension bridge.The main cable is the key to the construction control of the suspension bridge.In the calculation of main cable segment catenary, the analytic formula and iterative recurrence formula of segment catenary clue segment equation are derived in combination with existing research.Considering the influence of cable saddle on the geometrical position of the main cable end point, the formulas for calculating the tangent point coordinates of the existing main cable saddle and the scattered cable saddle are modified.The calculation flow of standard cable geometry parameters and internal forces is improved, and on this basis, the calculation method of geometric characteristic parameters of cable strands in different positions is deduced.According to the algorithm in this paper, a computer program for calculating the geometric parameters of the main cable in the bridge state is compiled with C language, and it is run on MATLAB.The results of this paper are in good agreement with the results of commercial programs.) combined with the Jindong Bridge, the main cable and stiffened beam are given.The construction monitoring contents of the tower and the state of the bridge and the calculation method of the key parameters. 4) the error analysis of the influence parameters of the suspension bridge's alignment is carried out. The analysis results show that,The influence of elastic modulus error of main cable and constant load error of stiffened beam on the unstressed length of main cable is obvious.For the Jindong Bridge, when the elastic modulus changes 鹵5, the unstressed length of the main cable changes to 鹵157 mm.If the constant load of the stiffened beam changes 鹵5, the unstressed length of the main cable changes to 鹵135mm.However, it can be adjusted by setting the appropriate length of the finished cable strands.The analysis also shows that the temperature has a great influence on the elevation of the main cable, which is -28mm / 鈩，

本文編號(hào)：1723357