發(fā)布時(shí)間：2018-04-05 16:05

  本文選題：索塔　切入點(diǎn)：穩(wěn)定性　出處：《長安大學(xué)》2015年碩士論文

【摘要】：在眾橋梁體系中,懸索橋以其跨越能力強(qiáng)、造價(jià)較低的特點(diǎn)越來越受到建設(shè)者的青睞。作為懸索橋受力體系中的重要承重構(gòu)件,索塔的受力性能也成為懸索橋設(shè)計(jì)中至關(guān)重要的一環(huán)。特別是隨著塔身的高聳化、塔柱截面的薄壁化以及各種新材料新工藝的應(yīng)用,使得索塔的剛度降低,其穩(wěn)定性問題也愈發(fā)值得去探究。本文對(duì)索塔進(jìn)行穩(wěn)定性分析時(shí),主要進(jìn)行了以下研究內(nèi)容:1.首先介紹了懸索橋體系中常見的索塔結(jié)構(gòu)形式和受力特點(diǎn),并在總結(jié)國內(nèi)外對(duì)索塔穩(wěn)定性問題研究的基礎(chǔ)上,從有限元法的角度分析了索塔失穩(wěn)的原因,并提出了結(jié)構(gòu)穩(wěn)定性的評(píng)價(jià)指標(biāo)。2.結(jié)合算例對(duì)受壓桿件的兩類穩(wěn)定性做了詳細(xì)的計(jì)算,并通過考慮不同非線性因素分析了壓桿的穩(wěn)定性破壞機(jī)理。建議對(duì)同類構(gòu)件進(jìn)行穩(wěn)定性分析時(shí),不可僅計(jì)入任一種單一的非線性因素,應(yīng)綜合考慮雙重非線性因素的影響。3.對(duì)依托工程中的索塔穩(wěn)定性進(jìn)行了詳細(xì)的分析計(jì)算,主要對(duì)裸塔和成橋狀態(tài)兩個(gè)工況進(jìn)行。通過對(duì)其屈曲穩(wěn)定性進(jìn)行計(jì)算并得出結(jié)論,證明主纜的約束作用對(duì)索塔的穩(wěn)定性影響十分明顯,以致可以改變其失穩(wěn)的方向,并提高了索塔結(jié)構(gòu)的整體穩(wěn)定性。4.通過計(jì)入初始缺陷和雙重非線性因素對(duì)索塔進(jìn)行了極限承載力分析,得到索塔的第二類穩(wěn)定安全系數(shù)在第一類穩(wěn)定安全系數(shù)的0.12~0.31倍之間,且失穩(wěn)時(shí)均為索塔底部混凝土材料發(fā)生受壓破壞。5.對(duì)影響索塔穩(wěn)定性的幾種主要因素進(jìn)行了參數(shù)化分析,量化了其影響的程度,本文選取了非線性因素、初始缺陷、約束條件、索塔剛度和靜風(fēng)荷載五種因素。
[Abstract]:In the common bridge system, the suspension bridge is more and more favored by the builders because of its strong span ability and low cost.As an important load-bearing member of suspension bridge, the mechanical behavior of cable tower has become an important part in the design of suspension bridge.Especially with the towering of tower the thin-walled section of tower column and the application of various new materials and new technology make the stiffness of cable tower reduce and its stability problem is more and more worth to explore.In this paper, the stability of the cable tower analysis, mainly carried out the following research content: 1.This paper first introduces the common structural forms and mechanical characteristics of cable towers in suspension bridge system, and on the basis of summing up the research on the stability of cable towers at home and abroad, analyzes the causes of tower instability from the point of view of finite element method.The evaluation index of structural stability.In this paper, two kinds of stability of compression bar are calculated in detail with examples, and the failure mechanism of compression rod is analyzed by considering different nonlinear factors.It is suggested that any single nonlinear factor should not be taken into account in the stability analysis of similar components, and the influence of double nonlinear factors should be considered synthetically.The stability of cable tower in supporting engineering is analyzed and calculated in detail, mainly for bare tower and bridge state.By calculating the buckling stability of the cable, it is proved that the constraint effect of the main cable on the stability of the cable tower is so obvious that the direction of its instability can be changed, and the overall stability of the tower structure can be improved by .4.By taking into account the initial defects and the double nonlinear factors, the ultimate bearing capacity of the cable tower is analyzed, and the stability safety factor of the second kind of cable tower is obtained in the range of 0.12 ~ 0.31 times of that of the first type.The concrete material at the bottom of the cable tower is subjected to compressive failure.The main factors affecting the stability of the cable tower are parameterized and the degree of influence is quantified. Five factors are selected in this paper: nonlinear factor, initial defect, constraint condition, tower stiffness and static wind load.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U448.25

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 程進(jìn),肖汝誠,項(xiàng)海帆;大跨徑懸索橋非線性靜風(fēng)穩(wěn)定性全過程分析[J];同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)版);2000年06期

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本文編號(hào)：1715477