【摘要】：近年來波形鋼腹板箱梁作為一種新型結(jié)構(gòu)在我國(guó)的發(fā)展非常迅速，2005年在我國(guó)江蘇省建成了國(guó)內(nèi)首座波形鋼腹板組合箱梁人行天橋，自此以后，我國(guó)對(duì)波形鋼腹板箱梁橋的設(shè)計(jì)計(jì)算理論研究及施工方法的探討迎來了一個(gè)新的春天。國(guó)家有關(guān)部門成立了相關(guān)的自然科學(xué)基金，為各科研機(jī)構(gòu)、高校提供相關(guān)研究課題。蘭州交通大學(xué)自2011年承擔(dān)波形鋼腹板箱梁的相關(guān)理論課題研究以來，通過實(shí)橋?qū)嶒?yàn)、理論計(jì)算、有限元數(shù)值分析，對(duì)各項(xiàng)課題進(jìn)行了詳盡研究。 本文基于等截面波形鋼腹板組合箱梁剪力滯效應(yīng)的研究，對(duì)變截面波形鋼腹板組合箱梁剪力滯效應(yīng)進(jìn)行初步探討，這是一個(gè)全新的課題。據(jù)相關(guān)文獻(xiàn)，對(duì)等截面混凝土箱梁剪力滯效應(yīng)的研究已處于比較成熟的階段，不論是數(shù)值模擬還是理論計(jì)算，都得出了比較理想的結(jié)果，，但對(duì)變截面波形鋼腹板組合箱梁剪力滯效應(yīng)的研究還處于萌芽階段。本文依托國(guó)家自然科學(xué)基金項(xiàng)目—大跨徑波形鋼腹板預(yù)應(yīng)力混凝土組合箱梁的力學(xué)性能分析與試驗(yàn)研究，項(xiàng)目批準(zhǔn)號(hào)（51368032），通過數(shù)值模擬和理論計(jì)算，對(duì)變截面波形鋼腹板組合箱梁剪力滯效應(yīng)進(jìn)行初步探討。主要工作及相關(guān)結(jié)論有： (1)按照項(xiàng)目試驗(yàn)梁建立（3m+3m）的連續(xù)梁空間有限元模型，在不同工況下，比較等截面波形鋼腹板組合箱梁和變截面波形鋼腹板組合箱梁的在相同計(jì)算截面上的剪力滯系數(shù)，發(fā)現(xiàn)兩者有很大差異，初步得出波形鋼腹板組合箱梁的剪力滯系數(shù)與截面形式密切相關(guān)的結(jié)論。 (2)按照橋梁設(shè)計(jì)規(guī)范，分別探究了兩車道和三車道550kN荷載作用下箱梁的剪力滯效應(yīng)，得出荷載橫向布置對(duì)箱梁剪力滯效應(yīng)有很大影響的結(jié)論，在荷載集度較大的地方，箱梁剪力滯較大，同時(shí)發(fā)現(xiàn)橫隔板對(duì)箱梁剪力滯也有比較大的影響。 (3)寬跨比是影響箱梁剪力滯效應(yīng)的主要因素，本文建立了不同寬跨比的變截面波形鋼腹板組合連續(xù)箱梁的有限元模型，分別研究了集中荷載和均布荷載作用下，寬跨比對(duì)組合箱梁剪力滯效應(yīng)的影響程度，發(fā)現(xiàn)在不同荷載工況下變截面組合箱梁的頂?shù)装寮袅禂?shù)在肋板附近隨寬跨比增加而增加，在箱梁中心附近隨寬跨比增大而減小。 (4)橫隔板的位置(間距)對(duì)箱梁剪力滯系數(shù)的影響是比較明顯的，本文討論了不同橫隔板位置(間距)時(shí)箱梁的最大剪力滯系數(shù)及位置，得出了橫隔板處箱梁剪力滯系數(shù)顯著減小并對(duì)橫隔板的最佳位置布置提出了建議。 (5)在不同荷載作用下，梁軸向的應(yīng)力分布也不同，也即箱梁的剪力滯效應(yīng)在軸向的分布也不同，這也是確定箱梁最大剪力滯位置的主要依據(jù)，在橫隔板兩側(cè)應(yīng)力出現(xiàn)明顯突變；在集中荷載作用下，最大剪力滯的位置就是加載位置（忽略橫隔板的影響時(shí)），均布荷載一般都出現(xiàn)在跨中位置（忽略橫隔板的影響），并且頂板的剪力滯系數(shù)大于底板的剪力滯系數(shù)。
[Abstract]:In recent years, as a new type of structure, the corrugated steel web box girder has been developed rapidly in China. In 2005, the first corrugated steel web composite box girder pedestrian footbridge was built in Jiangsu Province, China. In our country, the theoretical research on design and calculation of corrugated steel web box girder bridge and the discussion of construction method have ushered in a new spring. Relevant national departments have set up relevant natural science funds to provide relevant research topics for scientific research institutions and colleges and universities. Since Lanzhou Jiaotong University undertook the theoretical research on corrugated steel web box girder in 2011, through the real bridge experiment, theoretical calculation and finite element numerical analysis, various topics have been studied in detail. Based on the study of shear lag effect of corrugated steel web composite box girder with constant cross section, the shear lag effect of corrugated steel web composite box girder with variable cross section is discussed in this paper. This is a new subject. According to relevant literature, the research on shear lag effect of equivalent section concrete box girder has been in a mature stage. Both numerical simulation and theoretical calculation have obtained more ideal results. However, the study on shear lag effect of corrugated steel web composite box girder with variable cross-section is still in its infancy. In this paper, based on the National Natural Science Foundation of China project-long-span corrugated steel web prestressed concrete composite box girder mechanical performance analysis and experimental research, project approval No. (51368032), through numerical simulation and theoretical calculation, The shear lag effect of corrugated steel web composite box girder with variable cross section is discussed. The main work and relevant conclusions are as follows: (1) the spatial finite element model of (3m) continuous beam is established according to the project test beam, and under different working conditions, the spatial finite element model of continuous beam is established. Comparing the shear lag coefficient between the corrugated steel web composite box girder and the variable section corrugated steel web composite box girder on the same calculated section, it is found that there is a great difference between them. A preliminary conclusion is drawn that the shear lag factor of the corrugated steel web composite box girder is closely related to the cross-section form. (2) according to the bridge design code, the shear lag effect of box girder under two-lane and three-lane 550kN loads is investigated, and the conclusion is drawn that the transverse layout of load should have a great influence on the shear lag effect of box girder, where the load concentration is large, the shear lag effect of box girder under two-lane and three-lane load is investigated. It is found that the shear lag of box girder is larger than that of box girder, and it is also found that the transverse partition plate has a great influence on the shear lag of box girder. (3) the width-span ratio is the main factor that affects the shear lag effect of box girder. In this paper, the finite element model of continuous box girder with variable cross-section corrugated steel webs with different width-span ratio is established, and the concentrated load and the uniform load are studied respectively. The influence of width-span ratio on shear lag effect of composite box girder is studied. It is found that the shear lag coefficient of the top and floor of variable cross-section composite box girder increases with the increase of width-span ratio and decreases with the increase of width-span ratio at the center of box girder under different load conditions. (4) the influence of the position (spacing) of the diaphragm on the shear lag factor of the box girder is obvious. In this paper, the maximum shear lag factor and the position of the box girder with different transverse partition positions (spacing) are discussed. It is concluded that the shear lag factor of the box beam at the transverse partition plate is significantly reduced and some suggestions are put forward for the optimal placement of the transverse partition plate. (5) under different loads, the axial stress distribution of the beam is also different, that is, the axial distribution of shear lag effect of box girder is also different, which is the main basis for determining the maximum shear lag position of box girder. The stress on both sides of the diaphragm is abrupt. Under concentrated loads, the position of the maximum shear lag is the loading position (when the influence of the diaphragm is ignored), and the uniform load usually occurs in the middle of the span (ignoring the influence of the diaphragm). And the shear lag factor of the roof is larger than the shear lag factor of the floor.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U448.213

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張士鐸 ,丁蕓;變截面懸臂箱梁負(fù)剪力滯差分解[J];重慶交通學(xué)院學(xué)報(bào);1984年04期

2 丁南宏;林麗霞;錢永久;;變截面箱梁剪力滯及剪切變形效應(yīng)近似計(jì)算方法[J];鐵道科學(xué)與工程學(xué)報(bào);2011年01期

3 陳寶春,黃卿維;波形鋼腹板PC箱梁橋應(yīng)用綜述[J];公路;2005年07期

4 凌云,王建國(guó);一種分析箱梁剪滯效應(yīng)的廣義雜交有限條法[J];合肥工業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2005年01期

5 羅旗幟;薄壁箱形梁剪力滯計(jì)算的梁段有限元法[J];湖南大學(xué)學(xué)報(bào);1991年02期

6 羅旗幟;劉光棟;杜嘉斌;;薄壁曲線箱梁剪力滯效應(yīng)的梁段有限元法[J];湖南大學(xué)學(xué)報(bào)(自然科學(xué)版);2006年05期

7 劉曉丹;李廣軍;王靜;;薄壁箱形梁橋剪力滯效應(yīng)的能量變分法研究[J];佳木斯大學(xué)學(xué)報(bào)(自然科學(xué)版);2007年01期

8 蔡千典，冉一元;波形鋼腹板預(yù)應(yīng)力結(jié)合箱梁結(jié)構(gòu)特點(diǎn)的探討[J];橋梁建設(shè);1994年01期

9 張玉平;李傳習(xí);謝建湘;;結(jié)構(gòu)橫坡對(duì)斜拉橋箱梁剪力滯效應(yīng)的影響[J];交通科技;2008年05期

10 劉世忠;劉麗;;高墩大跨曲線剛構(gòu)橋箱梁剪力滯效應(yīng)研究[J];鐵道標(biāo)準(zhǔn)設(shè)計(jì);2008年09期

本文編號(hào)：2437260