本文選題：連續(xù)梁　切入點(diǎn)：剪力滯效應(yīng)　出處：《湖南科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：大跨徑預(yù)應(yīng)力混凝土箱形連續(xù)或剛構(gòu)橋多采用自平衡施工工藝,其剛度和荷載隨著懸臂施工進(jìn)程逐步形成,因此剪力滯效應(yīng)必須考慮施工過程的累積效果。與此同時(shí),目前剪力滯的研究多數(shù)沒有考慮荷載橫向作用位置產(chǎn)生的影響。本文旨在對(duì)PC箱梁橋自平衡施工累計(jì)剪力滯效應(yīng)以及成橋汽車荷載橫向變位對(duì)剪力滯特性的影響進(jìn)行系統(tǒng)的理論分析和實(shí)測(cè)研究。通過理論、實(shí)測(cè)以及有限元對(duì)比分析,得到的主要內(nèi)容和成果如下:1、采用廣義力與廣義位移的概念,對(duì)箱梁頂板、懸臂板、底板分設(shè)不同的剪力滯廣義縱向位移,采用二次拋物線作為翼板的翹曲位移函數(shù),運(yùn)用能量變分原理,建立了箱梁剪力滯控制微分方程。算例分析顯示荷載橫向變位對(duì)箱梁剪力滯效應(yīng)基本沒有影響,而對(duì)承載位置的縱向應(yīng)力分布影響很大。2、基于腹板剪切變形修正箱梁剪力滯翹曲位移函數(shù),統(tǒng)一全截面廣義位移,運(yùn)用能量變分法建立箱梁彎曲剪力滯控制微分方程。以微分方程的齊次通解為一維剪力滯梁段單元的位移模式,建立了單元?jiǎng)偠确匠?演算了單元?jiǎng)偠染仃嚺c荷載列陣計(jì)算式,在此基礎(chǔ)上采用Fortran語言編制了計(jì)算程序,建立了一種考慮腹板剪切變形的剪力滯效應(yīng)有限梁段模型。算例分析表明考慮腹板剪切變形的單剪滯位移算法比按傳統(tǒng)鐵木辛柯梁考慮平均剪切變形的三剪滯位移算法的精度高,特別是使得主梁變形更加接近塊體元模型。3、通過有限梁段模型、Midas FEA塊體元模型以及現(xiàn)場(chǎng)采集的試驗(yàn)數(shù)據(jù)分析,歸納出連續(xù)梁施工過程剪力滯效應(yīng)的一般規(guī)律以及汽車荷載橫向變位對(duì)箱梁剪力滯產(chǎn)生的影響,驗(yàn)證了理論算法在工程實(shí)際運(yùn)用中的準(zhǔn)確性和可操作性。
[Abstract]:Long span prestressed concrete box continuous or rigid frame bridges adopt self-balanced construction technology, and their stiffness and load are gradually formed with the cantilever construction process, so the effect of shear lag must be taken into account in the process of construction. At present, most of the researches on shear lag do not take into account the influence of the transverse position of load. The purpose of this paper is to study the accumulative shear lag effect of PC box girder bridge in self-balance construction and the influence of the lateral displacement of vehicle load on shear lag characteristic of the bridge. To carry out systematic theoretical analysis and practical research. The main contents and results obtained are as follows: 1. By using the concept of generalized force and generalized displacement, different shear lag generalized longitudinal displacements of box girder roof plate, cantilever plate and bottom plate are established. The quadratic parabola is used as the warping displacement function of the wing plate, and the governing differential equation of the box girder shear lag is established by using the energy variational principle. The analysis of the example shows that the lateral displacement of the load has no effect on the shear lag effect of the box girder. However, the longitudinal stress distribution of the bearing position is greatly affected. Based on the web shear deformation, the shear lag warpage displacement function of the box girder is corrected, and the generalized displacement of the whole section is unified. The differential equation of bending shear lag control of box girder is established by energy variational method. The element stiffness equation is established by taking the homogeneous general solution of differential equation as the displacement model of one-dimensional shear lag beam, and the element stiffness matrix and load matrix are calculated. On this basis, the calculation program is compiled by using Fortran language. In this paper, a finite beam segment model with shear lag effect considering web shear deformation is established. An example analysis shows that the single shear lag displacement algorithm considering web shear deformation is better than the traditional Timuxinko beam with three shear hysteretic positions considering average shear deformation. The accuracy of the shift algorithm is high, In particular, the deformation of the main beam is closer to that of the block element model. 3. Through the finite beam segment model, the Midas FEA block element model and the experimental data collected in the field are analyzed. The general law of shear lag effect during construction of continuous beam and the influence of lateral displacement of vehicle load on shear lag of box girder are summarized. The accuracy and maneuverability of the theoretical algorithm in engineering practice are verified.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441;U448.213

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 趙寶俊;郝憲武;李子青;;豎向預(yù)應(yīng)力作用下PC箱梁腹板應(yīng)力場(chǎng)分析[J];廣西大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年04期

2 張?jiān)?;高支架上超寬PC箱梁節(jié)段拼裝施工的質(zhì)量控制[J];公路工程;2010年04期

3 郭捷菲;陳干;;超寬PC箱梁現(xiàn)澆施工支架方案關(guān)鍵技術(shù)研究[J];公路工程;2013年04期

4 李超;陸孝如;萬水;余曉紅;;潑河大橋的波形鋼腹板PC箱梁的構(gòu)造與施工[J];黑龍江工程學(xué)院學(xué)報(bào);2006年02期

5 袁明;顏東煌;;PC箱梁豎向預(yù)應(yīng)力張拉錨固階段應(yīng)力損失研究[J];公路交通科技;2010年10期

6 王松;鄔曉光;鄭小剛;;PC箱梁施工水化熱規(guī)律分析及裂縫控制研究[J];江西建材;2014年02期

7 張崗;賀拴海;周勇軍;任偉;閆磊;;PC箱梁墩頂塊水化熱溫度沖擊模型及空間仿真[J];遼寧工程技術(shù)大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年01期

8 吳沖,曾明根,曹勁松,邵長(zhǎng)宇;PC箱梁與鋼桁架組合加勁梁斜拉橋的剛度與穩(wěn)定分析[J];橋梁建設(shè);2002年05期

9 邵長(zhǎng)宇;采用PC箱梁與鋼桁組合加勁梁的三塔斜拉橋方案構(gòu)思與分析研究[J];中國(guó)鐵道科學(xué);2003年04期

10 吳沖,曾明根,曹勁松,邵長(zhǎng)宇;PC箱梁與鋼桁架組合加勁梁斜拉橋的剛度與穩(wěn)定分析[J];鋼結(jié)構(gòu);2002年05期

相關(guān)博士學(xué)位論文 前1條

1 Ali Fadhil Naser Al-Dulaimi（那思）;PC箱梁橋加固前后損傷檢測(cè)及性能評(píng)價(jià)的理論與試驗(yàn)研究[D];哈爾濱工業(yè)大學(xué);2013年

相關(guān)碩士學(xué)位論文 前6條

1 黃敦文;PC箱梁橋施工及成橋剪力滯特性研究[D];湖南科技大學(xué);2015年

2 周泰生;連續(xù)剛構(gòu)橋波形鋼腹板PC組合箱梁與PC箱梁的對(duì)比研究[D];重慶交通大學(xué);2014年

3 王仁鵬;PC箱梁齒板錨固區(qū)拉壓桿模型研究與錨下抗裂計(jì)算分析[D];蘭州交通大學(xué);2013年

4 王永勝;雙排支座先簡(jiǎn)支后連續(xù)PC箱梁橋病害分析及加固方法[D];長(zhǎng)安大學(xué);2014年

5 蘇輝;短線法預(yù)制PC箱梁施工技術(shù)研究[D];西安建筑科技大學(xué);2007年

6 宋重陽;PC箱梁橋底板崩裂局部應(yīng)力分析及修復(fù)處理[D];西南交通大學(xué);2014年

，

本文編號(hào)：1583525