發(fā)布時(shí)間：2018-01-23 12:29

  本文關(guān)鍵詞： 薄壁變截面寬幅箱梁 剪力滯效應(yīng) 能量法 Midas Civil/fea　出處：《長(zhǎng)沙理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：本文對(duì)國(guó)內(nèi)外箱型截面橋梁的剪力滯效應(yīng)研究的現(xiàn)狀以及研究分析的方法做了詳盡的綜述,并對(duì)能量法運(yùn)用在薄壁寬幅變截面連續(xù)梁的剪力滯分析的公式和原來(lái)進(jìn)行了詳細(xì)的推導(dǎo),并以此為基礎(chǔ),第一步,通過(guò)對(duì)薄壁寬幅變截面連續(xù)梁的進(jìn)行理論計(jì)算,得出腹板與翼板交接處剪力滯效應(yīng)參數(shù)在縱向上分布規(guī)律,第二步,結(jié)合實(shí)際的橋涵工程即虎門白花山大橋,利用有限元軟件對(duì)薄壁寬幅箱型梁這種截面形式的主梁上的剪力滯效應(yīng)進(jìn)行計(jì)算分析和研究,并得出其分布規(guī)律,第三步,對(duì)比工程實(shí)踐的數(shù)據(jù),對(duì)其準(zhǔn)確性進(jìn)行對(duì)比分析,其主要工作內(nèi)容,為如下所示的幾個(gè)方面：(1)對(duì)箱型梁橋的剪力滯效應(yīng)以及負(fù)剪力滯效應(yīng)的研究背景、研究意義以及國(guó)內(nèi)外相關(guān)的研究現(xiàn)狀和剪力滯效應(yīng)的力學(xué)特點(diǎn)進(jìn)行闡述,并列出本文的研究?jī)?nèi)容和研究目標(biāo)。(2)詳細(xì)介紹能量變分法、比擬桿法、有限段法的計(jì)算原理。(3)通過(guò)基于能量變分法的最小勢(shì)能原理詳細(xì)推導(dǎo)了箱型截面的剪力滯效應(yīng)以及負(fù)剪力滯效應(yīng)的求解公式,并運(yùn)用此公式對(duì)工程實(shí)例中出現(xiàn)的變截面曲線薄壁寬幅箱型梁在自重荷載作用下的剪力滯效應(yīng)參數(shù)在腹板與翼板交接處的理論數(shù)值,進(jìn)而拓展對(duì)其分布規(guī)律進(jìn)行的分析和闡述,得出在理論范圍內(nèi)剪力滯效應(yīng)和負(fù)剪力滯效應(yīng)影響最大的截面。(4)通過(guò)建立虎門白花山大橋工程實(shí)例的Midas Civil桿單元有限元模型,對(duì)變截面曲線薄壁寬幅箱型梁在自重荷載作用下的關(guān)鍵施工階段進(jìn)行有限元模擬計(jì)算和分析,得出了在剪力滯效應(yīng)影響下縱向應(yīng)力的分布規(guī)律；通過(guò)建立Midas Fea實(shí)體單元有限元模型,對(duì)Midas Civil有限元計(jì)算中得出的受剪力滯效應(yīng)影響最大的截面(控制性截面)進(jìn)行局部分析,得出在剪力滯效應(yīng)和負(fù)剪力滯效應(yīng)影響下縱向正應(yīng)力沿橫向分布規(guī)律。(5)結(jié)合工程實(shí)例中的應(yīng)力監(jiān)控?cái)?shù)據(jù),對(duì)選定的關(guān)鍵截面應(yīng)力應(yīng)變值進(jìn)行分析,得出在剪力滯效應(yīng)影響下,縱向應(yīng)力沿橫向的分布規(guī)律并對(duì)理論數(shù)據(jù)和實(shí)測(cè)數(shù)據(jù)進(jìn)行對(duì)比分析。
[Abstract]:In this paper, the present situation of research on shear lag effect of box section bridges at home and abroad and the methods of research and analysis are summarized in detail. The formula of shear lag analysis of thin-walled and wide-width continuous beams with variable cross-section and the original formula are derived in detail, and based on this, the first step is to apply the energy method to the analysis of shear lag of continuous beams with variable cross-section of thin-walled and wide-amplitude. Through the theoretical calculation of the thin-walled wide variable cross-section continuous beam, the longitudinal distribution law of shear lag effect parameters at the junction of web and flange is obtained. The second step, combined with the actual bridge and culvert project, is the Humen Baihuashan Bridge. By using finite element software, the shear lag effect on the main girder with thin-walled and wide-width box girder is calculated and analyzed, and the distribution law is obtained. The third step is to compare the engineering data. Its accuracy is compared and analyzed. The main work is the background of the research on the shear lag effect and negative shear lag effect of box girder bridge in the following aspects: 1. The significance of the research and the research status at home and abroad as well as the mechanical characteristics of the shear lag effect are expounded, and the research contents and research objectives of this paper are listed. (2) the energy variation method and the analogy rod method are introduced in detail. Based on the minimum potential energy principle of the energy variational method, the formulas for solving the shear lag effect and the negative shear lag effect of the box section are derived in detail. Using this formula, the theoretical value of shear lag effect parameters of variable section curve thin-walled wide box girder under the action of deadweight load at the junction of web and fender is given by using this formula. And then expand the analysis and elaboration of its distribution law. The section with the greatest influence of shear lag effect and negative shear lag effect within the theoretical range is obtained. The finite element model of Midas Civil bar element is established through the engineering example of Humen Baihuashan Bridge. The finite element simulation and analysis of the key construction stage of variable section curve thin-walled and wide-width box girder under deadweight load are carried out, and the distribution of longitudinal stress under the influence of shear lag effect is obtained. The finite element model of Midas Fea solid element is established. The local analysis of the section (control section), which is most affected by shear lag effect, is carried out in the finite element calculation of Midas Civil. Under the influence of shear lag effect and negative shear lag effect, the longitudinal normal stress distribution along the transverse direction is obtained. (5) combined with the stress monitoring data of engineering examples, the selected stress and strain values of key sections are analyzed. Under the influence of shear lag effect, the distribution of longitudinal stress along the transverse direction is obtained, and the theoretical data and the measured data are compared and analyzed.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445;U448.213
，

本文編號(hào)：1457537