本文選題：波形鋼腹板組合箱梁　切入點(diǎn)：有效寬度　出處：《蘭州交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：相比較傳統(tǒng)的預(yù)應(yīng)力混凝土箱梁,體外預(yù)應(yīng)力波形鋼腹板組合箱梁具有結(jié)構(gòu)自重降低，同比減少25%～30%,結(jié)構(gòu)抗震性能好、外型美觀、節(jié)省建筑材料等諸多優(yōu)點(diǎn)。因?yàn)椴ㄐ武摳拱褰M合箱梁充分體現(xiàn)出了鋼-混凝土組合梁的優(yōu)點(diǎn)，尤其對(duì)于重荷、大跨度橋梁等要求梁截面高度低的橋梁更突顯出它的優(yōu)勢(shì)。波形鋼腹板組合箱梁具有較大的應(yīng)用范圍，適合在工程中較為普遍的推廣和應(yīng)用。 對(duì)于波形鋼腹板組合箱梁設(shè)計(jì)來(lái)說(shuō)，合理確定混凝土翼板的有效寬度是十分關(guān)鍵的。它的取值直接影響到其承載力及撓度計(jì)算。由于混凝土翼緣上剪力滯的影響，縱向應(yīng)力隨著離梁肋的距離增加而減小。而現(xiàn)今的橋梁規(guī)范通常采用定義“有效寬度”來(lái)解決這個(gè)問(wèn)題，從而填補(bǔ)了我國(guó)規(guī)范在計(jì)算箱梁翼緣有效寬度方面的空白，而且對(duì)有效寬度的使用環(huán)境進(jìn)行了規(guī)定，對(duì)實(shí)際設(shè)計(jì)起到建設(shè)性作用。 有效寬度的概念是針對(duì)受彎構(gòu)件的受“壓”翼緣提出的。承載能力極限狀態(tài)對(duì)結(jié)構(gòu)進(jìn)行承載能力計(jì)算時(shí)，彎效應(yīng)考慮有效寬度，壓效應(yīng)不考慮有效寬度。正常使用極限狀態(tài)對(duì)結(jié)構(gòu)的抗裂、裂縫寬度和撓度進(jìn)行驗(yàn)算時(shí)不考慮有效寬度。使用階段橫截面混凝土法向壓應(yīng)力計(jì)算時(shí)，彎效應(yīng)考慮有效寬度，壓效應(yīng)不考慮有效寬度。但是規(guī)范中對(duì)箱梁的翼板有效寬度取值是否同樣適用于波形鋼腹板這種特殊結(jié)構(gòu)還有待考證。另外，影響有效寬度取值的因素諸多復(fù)雜，由于技術(shù)資金等方面的問(wèn)題，，以前對(duì)波形鋼腹板的有效寬度難以進(jìn)行全面深入的精確研究。 本文以靜力試驗(yàn)研究為出發(fā)點(diǎn)，綜合波形鋼腹板組合箱梁的結(jié)構(gòu)特征，通過(guò)觀察并剖析模型在每個(gè)受力階段的監(jiān)測(cè)數(shù)據(jù)諸如變形性能、控制截面應(yīng)變等，進(jìn)而總結(jié)了波形鋼腹板組合箱梁翼板的應(yīng)力及應(yīng)變分布特點(diǎn)。針對(duì)上述情況，正文采用有限元分析軟件ANSYS數(shù)值模擬了模型的受力－變形始末，能夠?yàn)樯钊敕治鎏峁┮罁?jù)。為了全面合理地分析不同參數(shù)對(duì)波形鋼腹板組合箱梁混凝土翼板有效寬度的影響，本文確定了諸多不同波形鋼腹板組合箱梁模型，以不同結(jié)構(gòu)體系、荷載類型、箱梁幾何參數(shù)的變化等指標(biāo)為參數(shù)，以便較為系統(tǒng)地探討有效寬度的取值問(wèn)題。 最后本文在比較規(guī)范對(duì)波形鋼腹板組合箱梁有效翼緣寬度取值的基礎(chǔ)上，根據(jù)有限元模擬分析的系列結(jié)果提出了在實(shí)際設(shè)計(jì)中采用現(xiàn)行橋規(guī)來(lái)計(jì)算波形鋼腹板組合箱梁的混凝土翼緣有效分布寬度是偏于安全的，可供工程計(jì)算參考。
[Abstract]:Compared with the traditional prestressed concrete box girder, the external prestressed corrugated steel web composite box girder has the advantages of reduced structural weight, 25% less than the same number of years last year, good aseismic performance and beautiful appearance. Because the corrugated steel web composite box girder fully embodies the advantages of steel-concrete composite beam, especially for heavy load, The advantages of long-span bridges such as bridges with low cross-section height are highlighted. The composite box girders with corrugated steel webs have a wide range of applications and are suitable for popularization and application in engineering. For the design of composite box girder with corrugated steel webs, it is very important to reasonably determine the effective width of concrete flange. Its value directly affects the calculation of bearing capacity and deflection, because of the influence of shear lag on the flange of concrete. The longitudinal stress decreases with the increase of the distance from the beam rib. Nowadays, the bridge code usually uses the definition of "effective width" to solve this problem, thus filling the gap in the calculation of the effective width of the flange of box girder in our code. And the effective width of the use of the environment is specified, the actual design plays a constructive role. The concept of effective width is proposed for the "compressed" flange of a bending member. When calculating the bearing capacity of a structure under the ultimate state of bearing capacity, the effective width is considered in the bending effect. The effective width is not considered in the compression effect. The effective width is not considered when checking the crack width and deflection in the normal use limit state, and the effective width is taken into account in the normal compression stress calculation of the cross-section concrete in the use stage. The effective width is not considered in the compression effect. However, whether the effective width of the fender in the code is equally applicable to the special structure of the corrugated steel web is still to be verified. In addition, the factors affecting the effective width are complex. Due to technical problems, it is difficult to study the effective width of corrugated steel web. In this paper, based on the static test, the structural characteristics of the corrugated steel web composite box girder are synthesized, and the monitoring data of the model at each stress stage, such as deformation performance, control of cross-section strain, are observed and analyzed. Furthermore, the characteristics of stress and strain distribution of composite box girder with corrugated steel webs are summarized. In view of the above situation, the finite element analysis software ANSYS is used to simulate the stress and deformation of the model. In order to analyze the effect of different parameters on the effective width of concrete fender of composite box girder with corrugated steel webs, many models of composite box girder with different waveforms of steel webs are determined in this paper. The load type, the change of box girder geometric parameters and so on are parameters, so as to discuss the value of effective width systematically. Finally, on the basis of comparing the effective flange width of the corrugated steel web composite box girder, According to the series results of finite element simulation analysis, it is put forward that the effective distribution width of concrete flange of composite box girder with corrugated steel webs is safe in practical design, which can be used as a reference for engineering calculation.
【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)】：U448.213

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