發(fā)布時(shí)間：2018-11-10 11:44

【摘要】：多塔自錨式懸索橋施工控制的核心工序?yàn)榭绽|架設(shè)和吊索張拉,空纜架設(shè)期間因塔梁系統(tǒng)和纜索系統(tǒng)施工偏差以及施工期環(huán)境溫度的影響,空纜目標(biāo)線形發(fā)生變化�？绽|線形的精確性將直接影響成橋主纜線形,必要時(shí)應(yīng)采用調(diào)整索股張力的方法進(jìn)行空纜線形調(diào)整。不同于地錨式懸索橋采用的主梁吊裝工藝,自錨式懸索橋吊索張拉過程主梁剛度已經(jīng)形成,且主梁多支撐于支架上,吊索力不可能一次張拉到設(shè)計(jì)索力,必須進(jìn)行往復(fù)張拉。吊索張拉過程伴隨索鞍頂推,塔梁系統(tǒng)和纜索系統(tǒng)高度耦合,分析控制復(fù)雜。在制定合理的張拉方案時(shí),應(yīng)綜合考慮施工安全性和經(jīng)濟(jì)性,對張拉過程橋塔、主梁、吊索應(yīng)力狀態(tài)及千斤頂數(shù)量、接長桿數(shù)量等多目標(biāo)因素進(jìn)行綜合比選。本文采用有限元方法進(jìn)行自錨式懸索橋合理成橋狀態(tài)確定,計(jì)算結(jié)果與設(shè)計(jì)吻合較好。其中主纜線形最大偏差15mm;吊索力最大偏差3%;主纜無應(yīng)力長度偏差4cm,為主纜無應(yīng)力索長的萬分之0.8;吊索無應(yīng)力索長最大偏差11mm。對自錨式懸索橋空纜架設(shè)期間纜索系統(tǒng)、支撐系統(tǒng)及環(huán)境溫度作用下,空纜線形的敏感性進(jìn)行了細(xì)致的分析,結(jié)構(gòu)升降溫、主索鞍豎向施工偏差、散索鞍豎向施工偏差、錨面豎向及縱向施工偏差對空纜線形較為敏感。給出了各因素對空纜邊中跨垂點(diǎn)變形的影響系數(shù),提出快速查表方法對空纜目標(biāo)線形的修正計(jì)算,并給出算例驗(yàn)證。給出了空纜線形調(diào)整時(shí)各跨無應(yīng)力長度調(diào)整量,方便空纜線形調(diào)整。綜合施工期吊索應(yīng)力狀態(tài)、橋塔及主梁應(yīng)力狀態(tài),千斤頂數(shù)量、接長桿數(shù)量及規(guī)格、主纜和索鞍的相對幾何位置確定采用臨時(shí)壓重從跨中-橋塔張拉吊索為最優(yōu)張拉方案。針對最優(yōu)張拉方案,對吊索張拉過程橋塔應(yīng)力及塔頂偏位、主纜變形、索鞍與主纜接觸狀態(tài)以及施工期吊索力變化進(jìn)行了細(xì)致分析,分析表明本文推薦方案滿足各項(xiàng)控制要求。本文研究對于多塔自錨式懸索橋纜索系統(tǒng)施工過程控制分析具有重要的借鑒和參考意義。
[Abstract]:The core process of construction control of multi-tower self-anchored suspension bridge is aerial cable erection and sling tension. During aerial cable erection, the alignment of aerial cable object changes due to the construction deviation of tower and cable system and environmental temperature during construction. The accuracy of the cable shape will directly affect the main cable shape of the bridge. If necessary, the method of adjusting the cable tension should be adopted to adjust the cable shape. Different from the main beam hoisting technology adopted by ground anchor suspension bridge, the stiffness of the main beam has been formed during the stretching process of the suspension cable of the self-anchored suspension bridge, and the main beam is more supported on the support, the sling force cannot be pulled to the design cable force at one time, and the reciprocating tension must be carried out. The cable tension process is accompanied by the saddle pushing, the tower and beam systems are highly coupled with the cable system, and the analysis and control are complicated. When drawing up a reasonable tensioning scheme, the safety and economy of construction should be considered synthetically, and the multi-objective factors such as bridge tower, main beam, slings stress state, the number of Jack and the number of connecting rod should be comprehensively compared and selected. In this paper, the finite element method is used to determine the reasonable state of self-anchored suspension bridge. The calculated results are in good agreement with the design. The maximum deviation of main cable shape is 15mm; the maximum deviation of sling force is 3; the deviation of main cable's unstressed length is 4 cm, and the length of main cable's unstressed cable is 0.8%; the maximum deviation of sling's unstressed cable length is 11mm. In this paper, the sensitivity of cable system, support system and ambient temperature during the erection of aerial cable of self-anchored suspension bridge is analyzed in detail, the structure rises and cools, the vertical construction deviation of main cable saddle and the vertical construction deviation of loose cable saddle are analyzed. The vertical and longitudinal construction deviations of anchor face are sensitive to the aerial cable shape. The influence coefficients of various factors on the vertical deformation of midspan in the side of aerial cable are given, and the modified calculation of aerial cable target alignment by fast table checking method is put forward, and an example is given to verify the effect of these factors on the vertical deformation of aerial cable. The adjustment amount of each span's stress-free length during the adjustment of aerial cable shape is given, which is convenient for the adjustment of aerial cable shape. According to the stress state of sling during construction, the stress state of bridge tower and main beam, the number of Jack, the number and specification of connecting rod, and the relative geometric position of main cable and cable saddle, the optimum tension scheme is determined to be temporary compression weight from the mid-span to the bridge tower. Aiming at the optimal tensioning scheme, the stress of the tower, the deflection of the tower top, the deformation of the main cable, the contact state of the cable saddle with the main cable and the change of the cable force during the construction period are analyzed in detail. The analysis shows that the scheme recommended in this paper meets the control requirements. The research in this paper has important reference and reference significance for the construction process control analysis of cable system of multi-tower self-anchored suspension bridge.
【學(xué)位授予單位】：長安大學(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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