本文選題：索道橋 + 懸索�。� 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：現(xiàn)代索道橋是以承重索和錨碇為主要受力構(gòu)件、以鋼橫梁和橋面板等作為局部受力構(gòu)件的一種新型懸索體系橋梁，主要由承重索系統(tǒng)、穩(wěn)定結(jié)構(gòu)、橋面系、索塔錨碇四大部分組成，具有結(jié)構(gòu)簡(jiǎn)單、載重量大、材料用量小、建設(shè)周期短、建造成本低等特點(diǎn)。本文從現(xiàn)代索道橋的結(jié)構(gòu)特點(diǎn)出發(fā)，首先對(duì)懸索和橫梁等受力構(gòu)件進(jìn)行了靜力分析，然后研究了索道橋的幾何非線性特征，最后分析了其自振頻率及影響因素。具體研究?jī)?nèi)容如下： ①結(jié)合現(xiàn)代索道橋的結(jié)構(gòu)特點(diǎn)，分析了各構(gòu)件的受力特征；對(duì)索道橋的承重索進(jìn)行理論計(jì)算，得到了懸索的水平拉力、懸索索長(zhǎng)、空索狀態(tài)和成橋狀態(tài)時(shí)懸索拉力和矢度的近似計(jì)算公式；分析了現(xiàn)代索道橋穩(wěn)定橫梁的內(nèi)力及其作用原理，并結(jié)合工程實(shí)例研究了穩(wěn)定橫梁在降低偏載作用下橋面橫向傾斜程度及調(diào)配承重索受力等方面起到重要作用。 ②分析了橋梁結(jié)構(gòu)幾何非線性計(jì)算理論以及對(duì)現(xiàn)代索道橋進(jìn)行非線性有限元分析的重要性，以桿系結(jié)構(gòu)為出發(fā)點(diǎn)研究了幾何非線性分析的T.L列式法和U.L列式法，并對(duì)這兩種計(jì)算方法進(jìn)行了對(duì)比和總結(jié)；針對(duì)現(xiàn)代索道橋的懸索結(jié)構(gòu)，計(jì)算出平面柔性懸索單元的切線剛度矩陣，然后結(jié)合有限元軟件的分析方法，給出了Newton-Raphson法求解非線性方程的方法；最后結(jié)合工程實(shí)例，驗(yàn)證了非線性有限元分析方法在現(xiàn)代索道橋計(jì)算中適用性和必要性。 ③分析了現(xiàn)代索道橋的振動(dòng)特性，并以弦的振動(dòng)為出發(fā)點(diǎn)計(jì)算得到懸索的三維動(dòng)力學(xué)方程，根據(jù)現(xiàn)代索道橋懸索特點(diǎn)，得到索道橋豎向自振頻率和扭轉(zhuǎn)振動(dòng)頻率的近似計(jì)算公式；最后結(jié)合工程實(shí)例，，對(duì)索道橋自振頻率的影響因素進(jìn)行計(jì)算和對(duì)比分析，得到了矢跨比、自重集度、承重索型號(hào)和橫梁尺寸等因素對(duì)索道橋自振頻率的影響規(guī)律。
[Abstract]:The modern cable-way bridge is a new type of suspension system bridge with load-bearing cable and Anchorage as the main force member, steel cross beam and bridge deck as the local force member, mainly composed of load-bearing cable system, stable structure, bridge deck system, etc. The cable tower Anchorage is composed of four parts. It has the characteristics of simple structure, large load, small material consumption, short construction period and low construction cost. Based on the structural characteristics of the modern cableway bridge, the static analysis of the cable and beam is carried out in this paper, then the geometric nonlinear characteristics of the cableway bridge are studied. Finally, the natural vibration frequency and the influencing factors of the cableway bridge are analyzed. The specific contents of the study are as follows: The main contents are as follows: 1. According to the structural characteristics of the modern cableway bridge, the stress characteristics of each component are analyzed, and the horizontal tension and the length of the suspension cable are obtained by theoretical calculation of the load-bearing cable of the ropeway bridge. The approximate formulas for calculating the tension and vector of the suspension cable in the state of the empty cable and the state of the bridge are given, and the internal force of the stable crossbeam of the modern cableway bridge and its action principle are analyzed. Combined with an engineering example, it is studied that stable beam plays an important role in reducing the transverse slope of the bridge deck under the action of eccentric load and in adjusting the load bearing capacity of the bearing cable. The importance of nonlinear finite element analysis for modern cableway bridges is analyzed. The T.L and U.L formulations of geometric nonlinear analysis are studied from the point of view of the bar structure. The tangent stiffness matrix of the plane flexible cable element is calculated according to the cable structure of the modern cableway bridge, and then the finite element analysis method is combined with the finite element analysis method. The method of solving nonlinear equations by Newton-Raphson method is given, and the applicability and necessity of nonlinear finite element analysis method in modern cableway bridge calculation are verified by an engineering example. 3. The vibration characteristics of the modern cableway bridge are analyzed, and the three-dimensional dynamic equations of the suspension cable are calculated based on the vibration of the string, according to the characteristics of the suspension cable of the modern cableway bridge. The approximate formulas of vertical natural vibration frequency and torsional vibration frequency of cableway bridge are obtained. Finally, the factors affecting the natural vibration frequency of ropeway bridge are calculated and compared with engineering examples, and the ratio of vector to span and the density of gravity are obtained. The influence of bearing cable type and beam size on the natural vibration frequency of ropeway bridge.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.25

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