本文選題：波形鋼腹板　切入點：剪力滯　出處：《蘭州交通大學》2017年碩士論文

【摘要】：波形鋼腹板箱梁橋作為一種新型鋼混組合結構在國內外使用頻率越來越高。其擁有很多優(yōu)點,諸如結構自重低、預應力施加效率高、施工簡便、跨越能力突出以及造型美觀等。從20世紀80年代這種結構首先在法國出現以后,很快便得以在日本德國等國家得到推廣,相應的研究也逐步深入。近年來,國內也出現大量的該類型箱梁橋。隨著橋梁結構愈加復雜化,所需研究內容也大大增加。本文以國內一座大跨度變截面波形鋼腹板連續(xù)梁橋為依托進行了一些研究。主要內容是在考慮剪切變形及剪力滯效應的共同作用下,對波形鋼腹板大跨度變截面連續(xù)梁撓度計算方法的探討。研究的過程主要運用到能量變分法對其撓度計算公式進行了推導,并對波形鋼腹板截面慣性距的計算方法進行了簡化。同時使用ANSYS軟件建立三維有限元模型對該計算方法進行了驗證。最終結果表明,該計算方法能較為準確的求解出荷載作用下箱梁各位置處撓度,能為施工設計起到指導作用。本文還對波形鋼腹板箱梁的動力特性進行了研究,并分別建立梁單元與實體單元模型,對比分析了各自的特點。通過對比實體模型與梁單元模型后我們可以知道,在滿足工程精度要求的前提下,計算箱梁自振特性時可以用工程師熟練掌握的梁單元建立模型而不必用建立復雜的實體模型,梁單元模型同樣能夠達到較為精確的結果。此外,還建立了跨徑布置相同的普通腹板箱梁。對兩者的自重、墩頂和跨中彎矩、截面特性以及動力特性進行了對比分析。結果表明普通混凝土箱梁相比波形鋼腹板梁體自重減輕了約20%,跨中最大正彎矩降低11.7%,墩頂最大負彎矩降低20.7%,這有利于提高結構經濟性。兩者的縱橫向抗彎剛度相差都不是很大,但是抗扭剛度降低較多,需要特別注意。并研究跨中橫隔板對于抗扭剛度的影響,得出其雖然能夠提高結構抗扭性能但是提高幅度有限的結論。在對自振頻率進行研究后發(fā)現,波形鋼腹板箱梁扭轉頻率主要發(fā)生在高階,高于結構主頻,可認為其仍舊具有較高抗扭剛度。
[Abstract]:As a new type of steel-concrete composite structure, box-girder bridge with corrugated steel web is used more and more frequently at home and abroad.It has many advantages, such as low weight of structure, high efficiency of prestress application, simple construction, outstanding span ability and beautiful shape.Since the first appearance of this structure in France in the 1980s, it has been popularized in Japan and Germany, and the corresponding research has been gradually deepened.In recent years, there are a large number of box girder bridges in China.With the increasing complexity of bridge structure, the research content is greatly increased.In this paper, a large span corrugated steel web continuous beam bridge with variable cross section is studied.The main content of this paper is to discuss the deflection calculation method of long-span continuous beam with variable cross section of corrugated steel web under the joint action of shear deformation and shear lag effect.The calculation formula of deflection is deduced by energy variational method, and the calculation method of inertia distance of corrugated steel web section is simplified.At the same time, the three-dimensional finite element model with ANSYS software is used to verify the method.The final results show that the calculation method can accurately calculate the deflection of the box girder under load, and can play a guiding role in the construction design.The dynamic characteristics of corrugated steel web box girder are also studied in this paper. The model of beam element and solid element are established, and their characteristics are compared and analyzed.After comparing the solid model with the beam element model, we can know that, on the premise of meeting the requirement of engineering precision, the model can be established by using the beam element which the engineer is familiar with, but not the complicated solid model, when calculating the natural vibration characteristics of the box girder.The beam element model can also achieve more accurate results.In addition, the common web box girder with the same span arrangement is also established.The weight, bending moment of pier top and span, cross-section characteristic and dynamic characteristic are compared and analyzed.The results show that compared with corrugated steel web beam, the weight of ordinary concrete box girder is reduced by about 20 percent, the maximum positive moment of span is reduced by 11.7m and the maximum negative moment of pier top is reduced by 20.7. this is beneficial to improve the structure economy.The difference of longitudinal and transverse flexural stiffness is not very big, but the torsional stiffness is much lower, so special attention should be paid to it.The effect of straddle plate on torsional stiffness is studied, and the conclusion is drawn that although it can improve the torsional performance of the structure, the range is limited.It is found that the torsional frequency of the corrugated steel web box girder mainly occurs in higher order, which is higher than the main frequency of the structure, so it can be considered that it still has high torsional stiffness.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U441

【參考文獻】

相關期刊論文 前10條

1 李杰;周亞鵬;陳淮;;波形鋼腹板連續(xù)箱梁的結構參數對其自振影響分析[J];鄭州大學學報(理學版);2017年01期

2 馬磊;萬水;蔣正文;;單箱多室波形鋼腹板簡支箱梁偏載系數簡化計算方法[J];公路交通科技;2017年02期

3 冀偉;鄧露;劉世忠;藺鵬臻;;變截面波形鋼腹板PC箱梁橋的動力特性分析[J];鐵道工程學報;2016年03期

4 李立峰;侯立超;孫君翠;;波形鋼腹板抗剪性能的研究[J];湖南大學學報(自然科學版);2015年11期

5 陳水生;陳志興;;橫隔板對波形鋼腹板箱梁動力特性的影響分析[J];中外公路;2015年03期

6 豐月華;;大跨度波形鋼腹板連續(xù)箱梁橋結構設計與受力特性分析[J];公路交通科技(應用技術版);2015年02期

7 周勇超;郝憲武;李子青;;變截面波形鋼腹板組合梁剪力滯效應[J];長安大學學報(自然科學版);2014年04期

8 王松林;楊天軍;;大跨度波形鋼腹板PC組合連續(xù)箱梁橋動力特性和及響應分析[J];公路交通科技(應用技術版);2014年07期

9 冀偉;吳煥慶;劉世忠;;附加軸向位移對薄壁箱梁翼板應力的影響[J];公路交通科技;2013年09期

10 張元海;林麗霞;;薄壁箱梁剪力滯效應分析的初參數法[J];工程力學;2013年08期

相關碩士學位論文 前3條

1 石錦光;波形鋼腹板PC組合箱梁的動力特性分析[D];重慶交通大學;2013年

2 栗國君;波形鋼腹板PC組合連續(xù)箱梁橋的靜動力特性分析研究[D];西南交通大學;2010年

3 程德林;波紋鋼腹板預應力混凝土組合箱梁抗彎性能研究[D];長安大學;2007年

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