本文關(guān)鍵詞：地震荷載作用下曲線箱梁剪力滯效應(yīng)研究　出處：《武漢工程大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 曲線梁 箱型截面 剪力滯效應(yīng) 地震荷載

【摘要】：曲線箱梁橋由于自身特點而在工程中應(yīng)用廣泛，但箱型截面所帶來的剪力滯效應(yīng)對橋梁的安全會造成一定的影響，同時，曲率的存在使橋梁中存在著彎扭耦合效應(yīng)，在一定程度上又會加劇剪力滯效應(yīng)的影響。國內(nèi)外學(xué)者對曲線箱梁剪力滯效應(yīng)做了大量的研究工作，取得了一些成果，但這些研究大部分都基于靜荷載，對動荷載作用下的剪力滯效應(yīng)鮮有涉及，而實際的橋梁結(jié)構(gòu)處在動荷載作用下，，基于靜荷載的分析結(jié)果并不能完全滿足工程實際需求。為此，本文采用有限元法，運用有限元分析軟件ANSYS建立曲線箱梁的有限元分析模型，分析在其地震荷載作用下的剪力滯效應(yīng)，主要的研究內(nèi)容如下： 1.分別建立梁單元、殼單元和三維實體單元的有限元分析模型，進行了各分析模型的動力特征分析和時程分析，結(jié)果表明殼單元分析模型精度較高計算也較為高效。 2.進行了曲線箱梁有限元分析模型在地震荷載作用下的時程分析，并采用應(yīng)力取平均值來代替初等梁理論計算值的簡化的計算方法計算節(jié)點的剪力滯系數(shù)，結(jié)果表明在地震荷載作用下節(jié)點的剪力滯系數(shù)的值在基準值附近波動，荷載大小的變化對剪力滯效應(yīng)的影響是次要的。 3.進行在地震荷載下，曲率半徑、腹板間距、箱梁高度以及腹板厚度對剪力滯效應(yīng)影響的分析，得到了這些結(jié)構(gòu)參數(shù)對剪力滯效應(yīng)的影響規(guī)律，結(jié)果表明曲率半徑和腹板間距的變化對剪力滯效應(yīng)的影響明顯。 以上的研究結(jié)果對工程應(yīng)用具有重要的參考價值。
[Abstract]:Curved box girder bridge is widely used in engineering because of its own characteristics, but the shear lag effect brought by box section will have a certain impact on the safety of the bridge, at the same time. The existence of curvature makes the coupling effect of bending and torsion exist in the bridge, to a certain extent, it will aggravate the influence of shear lag effect. Scholars at home and abroad have done a lot of research work on the shear lag effect of curved box girder. Some achievements have been made, but most of these studies are based on static load, and the shear lag effect under dynamic load is rarely involved, but the actual bridge structure is under dynamic load. The analysis results based on static load can not fully meet the actual needs of the project. Therefore, the finite element analysis model of curved box girder is established by using finite element method and finite element analysis software ANSYS. The shear lag effect under the earthquake load is analyzed. The main research contents are as follows: 1. The finite element analysis models of beam element, shell element and three-dimensional solid element are established, and the dynamic characteristic analysis and time history analysis of each analysis model are carried out. The results show that the accuracy of the shell element analysis model is higher and the calculation is more efficient. 2. The time-history analysis of the finite element analysis model of curved box girder under the action of earthquake load is carried out, and the shear lag coefficient of the node is calculated by using the mean value of stress instead of the simplified calculation method of the theoretical calculation value of the elementary beam. The results show that the shear lag coefficient of the joints fluctuates near the reference value under the earthquake load, and the influence of the load magnitude on the shear lag effect is secondary. 3. The influence of curvature radius, web spacing, box girder height and web thickness on shear lag effect is analyzed, and the influence of these structural parameters on shear lag effect is obtained. The results show that the changes of curvature radius and web spacing have obvious influence on the shear lag effect. The above research results have important reference value for engineering application.
【學(xué)位授予單位】：武漢工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441;U442.55

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本文編號：1399442