本文選題：波形鋼腹板　切入點(diǎn)：組合箱梁橋　出處：《蘭州交通大學(xué)》2015年碩士論文

【摘要】：波形鋼腹板PC組合箱梁橋結(jié)構(gòu)因能夠充分利用混凝土和鋼腹板的材料特點(diǎn)及結(jié)構(gòu)受力明確等優(yōu)勢而受到國內(nèi)外眾多設(shè)計(jì)師的青睞,然而國內(nèi)對(duì)該橋型的理論研究尚處于探索階段,實(shí)際工程應(yīng)用較少,設(shè)計(jì)與施工水平有待進(jìn)一步提高。在波形鋼腹板PC組合箱梁抗剪承載力驗(yàn)算中,波形鋼腹板的剪切屈曲穩(wěn)定扮演著不可替代的控制因素,因此對(duì)其進(jìn)行定性定量分析顯得異常必要。本文在分析國內(nèi)外現(xiàn)有研究成果和工程設(shè)計(jì)實(shí)例的基礎(chǔ)上,采用大型通用有限元程序ANSYS并結(jié)合現(xiàn)有理論,建立不同幾何構(gòu)造參數(shù)的腹板空間有限元模型,分別進(jìn)行線性、非線性有限元分析計(jì)算,研究成果可為波形鋼腹板在實(shí)橋中的尺寸設(shè)計(jì)提供理論依據(jù)。主要完成工作如下;一、在大量閱讀國內(nèi)外有關(guān)該組合梁橋研究成果的基礎(chǔ)上,對(duì)波形鋼腹板屈曲穩(wěn)定理論進(jìn)行了整理,總結(jié)了腹板局部屈曲強(qiáng)度、整體屈曲強(qiáng)度及合成屈曲強(qiáng)度的線彈性理論公式,及考慮塑性變形的非線性經(jīng)驗(yàn)公式。二、采用ANSYS建立空間有限元模型,建模過程中假定剪力完全由波形鋼腹板承擔(dān),即腹板處于純剪切受力狀態(tài),波腹板幾何尺寸在參考鄄城黃河大橋的基礎(chǔ)上變化,在理想線彈性條件下對(duì)結(jié)構(gòu)進(jìn)行特征值屈曲分析,分別研究腹板波形形狀(波高、波折角度、直板長度)、板厚、腹板高度和橫隔板間距等變化對(duì)結(jié)構(gòu)屈曲模態(tài)和屈曲極限荷載的影響規(guī)律,并將不同算例代入彈性屈曲理論公式進(jìn)行計(jì)算,對(duì)各計(jì)算理論的準(zhǔn)確性和適用性進(jìn)行了評(píng)價(jià)和驗(yàn)證。三、在腹板特征值屈曲分析的基礎(chǔ)上,通過ANSYS非線性屈曲分析功能,采用一致缺陷模態(tài)法引入結(jié)構(gòu)初始幾何缺陷,并計(jì)入材料非線性、幾何非線性和大變形效應(yīng)等,啟用ANSYS弧長搜索功能,對(duì)波形鋼腹板全過程屈曲響應(yīng)進(jìn)行跟蹤分析。研究各幾何構(gòu)造參數(shù)在非線性有限元計(jì)算條件下腹板剪切屈曲全過程荷載-位移曲線及屈曲極限荷載變化趨勢,并對(duì)屈曲后行為進(jìn)行研究分析。四、將有限元計(jì)算值和理論計(jì)算結(jié)果進(jìn)行對(duì)比分析,對(duì)線彈性和非線性范圍內(nèi)各理論公式的適用性進(jìn)行評(píng)價(jià),給出了相應(yīng)計(jì)算建議采用的理論公式。本文通過對(duì)波形鋼腹板剪切屈曲穩(wěn)定性能的研究,希望研究內(nèi)容能為同類型橋梁的計(jì)算設(shè)計(jì)和施工工藝提供一定的理論參考。
[Abstract]:The structure of PC composite box girder bridge with corrugated steel webs is favored by many designers at home and abroad because it can make full use of the material characteristics of concrete and steel webs and the clear force of the structure.However, the theoretical study of the bridge is still in the exploratory stage, the practical engineering application is relatively few, and the level of design and construction needs to be further improved.The shear buckling stability of corrugated steel webs plays an irreplaceable control factor in the checking calculation of shear bearing capacity of PC composite box girder with corrugated steel webs, so it is very necessary to make qualitative and quantitative analysis of the shear buckling stability of corrugated steel webs.In this paper, based on the analysis of existing research results and engineering design examples at home and abroad, a web space finite element model with different geometric construction parameters is established by using the large and universal finite element program ANSYS and the existing theory.Nonlinear finite element analysis and calculation, the research results can provide theoretical basis for the size design of corrugated steel web in the real bridge.The main works are as follows: firstly, based on the domestic and foreign research results of the composite girder bridge, the buckling stability theory of the corrugated steel web is sorted out, and the local buckling strength of the web is summarized.The linear elastic theory formula of global buckling strength and synthetic buckling strength, and the nonlinear empirical formula considering plastic deformation.Secondly, the spatial finite element model is established by ANSYS. In the process of modeling, it is assumed that the shear force is borne entirely by the corrugated steel web, that is, the web is in the state of pure shear force, and the geometric dimension of the wave web is changed on the basis of referring to Juancheng Yellow River Bridge.Under the ideal linear elastic condition, the eigenvalue buckling analysis of the structure is carried out, and the shape of the web waveform (wave height, wave angle, length of the straight plate, thickness of the plate) is studied, respectively.The influence of the web height and the spacing of the transverse spacer on the buckling mode and ultimate load of the structure is studied. Different examples are added to the elastic buckling theory formula to evaluate and verify the accuracy and applicability of the calculation theory.Thirdly, on the basis of eigenvalue buckling analysis of web, through ANSYS nonlinear buckling analysis function, the uniform defect mode method is used to introduce the initial geometric defects of the structure, including material nonlinearity, geometric nonlinearity and large deformation effect, etc.The whole buckling response of the corrugated steel web is analyzed by using the ANSYS arc length search function.The load-displacement curves and ultimate buckling load trends of web shear buckling under nonlinear finite element method are studied and the post-buckling behavior is analyzed.Fourthly, the finite element calculation value and the theoretical calculation result are compared and analyzed, the applicability of each theoretical formula in the range of linear elasticity and nonlinearity is evaluated, and the corresponding theoretical formula suggested for calculation is given.In this paper, the shear buckling stability of corrugated steel webs is studied. It is hoped that the research can provide a theoretical reference for the calculation, design and construction of the same type bridges.
【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】：2015
【分類號(hào)】：U441

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 楊健;波形鋼腹板PC組合箱梁腹板穩(wěn)定性研究[D];蘭州交通大學(xué);2014年

，

本文編號(hào)：1708583