本文選題：懸索橋 + 索夾　； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：主纜作為懸索橋結(jié)構(gòu)的重要承力構(gòu)件,隨著懸索橋跨徑的增大,其彎曲剛度對主纜線形的影響將愈發(fā)凸顯;索夾作為懸索橋主纜與吊索的連接及傳力構(gòu)件,現(xiàn)代懸索橋中"銷接式"索夾可以將吊索索力分散為索夾長度范圍內(nèi)的分布力。目前,在懸索橋結(jié)構(gòu)的整體計(jì)算理論及分析方法中,均將主纜簡化為分段懸鏈線、將吊索與主纜的連接簡化為集中力形式,對于主纜直徑較大、索夾長度較長的懸索橋結(jié)構(gòu),上述簡化方式可能引起主纜線形及吊索力的計(jì)算值偏離結(jié)構(gòu)真實(shí)值,可行的優(yōu)化方法是在有限元計(jì)算中考慮主纜彎曲剛度及索夾構(gòu)件對結(jié)構(gòu)的影響。本文主要通過以下幾個(gè)方面對主纜線形的計(jì)算模式進(jìn)行分析研究:(1)基于多尺度有限元計(jì)算方法,綜合考慮索夾螺桿的張拉、索夾與主纜間的界面接觸,研究了索夾構(gòu)件的傳力機(jī)理,對比分析了索夾長度、索夾傾角、主纜彎曲剛度等對索夾傳力機(jī)理的影響,并在此基礎(chǔ)上提出了 3種可行的索夾傳力簡化模式。(2)在索夾傳力簡化模式的基礎(chǔ)上總結(jié)了 4種主纜線形計(jì)算模式,分別以一座主跨218m的自錨式懸索橋和一座主跨600m的地錨式懸索橋?yàn)楣こ桃劳?詳細(xì)分析了不同主纜線形計(jì)算模式對主纜線形、吊索力及吊索無應(yīng)力長度的影響。(3)在算例結(jié)構(gòu)的基礎(chǔ)上,通過結(jié)構(gòu)再設(shè)計(jì),分別擬定7種跨徑布置的自錨及地錨式懸索橋結(jié)構(gòu),重點(diǎn)討論了主纜彎曲剛度、索夾傳力簡化模式對不同跨度懸索橋主纜線形及吊索力的影響及影響程度,提出了不同跨度懸索橋的精細(xì)化計(jì)算模型建議。研究結(jié)果表明,索夾范圍內(nèi)的主纜豎向力呈凹拋物線形式分布,主纜彎曲剛度的形成會促進(jìn)索夾傳力路徑向索夾端部移動(dòng)。采用"均布力形式"得到的主纜成橋線形更接近于實(shí)際線形,采用"二力桿形式"得到的主纜成橋線形整體高于實(shí)際線形。對于自錨式懸索橋,當(dāng)主纜跨度小于150m時(shí),橋塔至1/4跨范圍內(nèi)的主纜線形計(jì)算需要考慮索夾的影響;當(dāng)主纜跨度在[150m,250m]范圍內(nèi)時(shí),吊索力的計(jì)算需要考慮主纜彎曲剛度的影響,且靠近橋塔的主纜線形計(jì)算需要考慮索夾的影響;當(dāng)主纜跨度在[250m,350m]范圍內(nèi)時(shí),主纜線形及吊索力的計(jì)算均需要考慮主纜彎曲剛度的影響,且靠近橋塔的主纜線形計(jì)算需要考慮索夾的影響;當(dāng)主纜跨度大于350m時(shí),主纜線形及吊索力的計(jì)算僅需考慮主纜彎曲剛度的影響。對于地錨式懸索橋,當(dāng)主纜跨度小于250m時(shí),靠近橋塔的主纜線形計(jì)算需要考慮索夾的影響;當(dāng)主纜跨度在[250m,500m]范圍內(nèi)時(shí),無需考慮主纜彎曲剛度及索夾的影響;當(dāng)主纜跨度大于500m時(shí),主纜線形計(jì)算需要考慮主纜彎曲剛度的影響。
[Abstract]:As an important bearing member of suspension bridge structure, as the span of suspension bridge increases, the influence of its bending stiffness on the main cable shape will become more prominent, and the cable clip will be used as the connection and force transfer member between the main cable and the slings of the suspension bridge.In the modern suspension bridge, the "pin type" cable clamp can spread the cable force into the distributed force in the cable clip length range.At present, in the whole calculation theory and analysis method of suspension bridge structure, the main cable is simplified as a segmented catenary, and the connection between the sling and the main cable is simplified as a concentrated force form. For the suspension bridge structure with larger main cable diameter and longer cable clip length,The simplified method may cause the calculation value of the main cable shape and the slings force to deviate from the real value of the structure. The feasible optimization method is to consider the influence of the bending stiffness of the main cable and the cable clamping member on the structure in the finite element calculation.In this paper, the calculation model of the main cable shape is analyzed and studied in the following aspects: 1) based on the multi-scale finite element method, the tension of the cable clip screw and the interface contact between the cable clip and the main cable are considered synthetically.The force transfer mechanism of cable clamp member is studied, and the effects of cable clip length, cable inclination angle and bending stiffness of main cable on the mechanism of cable clamp force transfer are compared and analyzed.On the basis of this, three feasible simplified modes of cable transmission force are put forward. Based on the simplified mode of cable clamp force transfer, four kinds of main cable shape calculation modes are summarized.Based on a self-anchored suspension bridge with a main span of 218m and a ground anchor suspension bridge with a main span of 600m, this paper analyzes in detail the different calculation modes of the main cable line.On the basis of example structure design, seven kinds of self-anchored and ground-anchored suspension bridge structures with span arrangement are worked out, and the bending stiffness of main cable is discussed emphatically.The influence and degree of the simplified mode of cable transfer force on the main cable shape and slings force of different span suspension bridges are discussed. The detailed calculation model of different span suspension bridges is proposed.The results show that the vertical force of the main cable is distributed in the form of concave parabola and the bending stiffness of the main cable will promote the path of the cable to move to the end of the cable clip.The main cable formed by "uniform force distribution" is closer to the actual alignment, and the main cable by "two-force bar" is higher than the actual one.For self-anchored suspension bridges, when the main cable span is less than 150m, the influence of cable clamps should be considered in the calculation of the main cable shape from the tower to 1 / 4 span, and when the main cable span is in the range of [150m ~ 250m], the influence of the bending stiffness of the main cable should be taken into account in the calculation of the sling force.The influence of cable clamp should be considered in the calculation of the main cable shape near the bridge tower, and when the span of the main cable is in the range of [250m ~ 350m], the influence of the bending stiffness of the main cable should be taken into account in the calculation of the main cable shape and the slings force.When the span of the main cable is more than 350 m, the influence of the bending stiffness of the main cable should only be taken into account in the calculation of the main cable shape and slings force.For the ground anchor suspension bridge, when the main cable span is less than 250 m, the influence of cable clip should be considered in the calculation of the main cable shape near the bridge tower, and when the main cable span is in the range of [250 m ~ 500m], the influence of the main cable bending stiffness and cable clamp should not be considered.When the span of the main cable is more than 500 m, the influence of the bending stiffness of the main cable should be considered in the calculation of the main cable shape.
【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】：U448.25

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