本文選題：斜交箱梁橋 + 畸變角��； 參考：《石家莊鐵道大學(xué)》2015年碩士論文

【摘要】：箱梁的截面形狀是幾何可變的,因此在偏載或反對(duì)稱荷載作用下,箱梁截面不僅產(chǎn)生剛性扭轉(zhuǎn)還會(huì)產(chǎn)生隨畸變。目前,對(duì)于正交箱梁橋的畸變角和畸變應(yīng)力的理論計(jì)算方法,國(guó)內(nèi)外學(xué)者進(jìn)行了大量的研究,并取得了相應(yīng)的成果。但是有關(guān)斜橋的畸變效應(yīng)研究很少,故本文分析了斜交箱梁橋在靜載和動(dòng)載作用下預(yù)應(yīng)力斜交箱梁橋的畸變效應(yīng)變化規(guī)律。運(yùn)用大型軟件ANSYS分別建立了簡(jiǎn)支和三跨連續(xù)斜交箱梁橋模型。首先,分析了簡(jiǎn)支和連續(xù)斜交箱梁橋自重下的縱向畸變效應(yīng)并獲得最不利截面;隨后靜力部分建立了一系列箱梁模型,分析參數(shù)變化時(shí)腹板與頂板交界處的畸變角縱向變化規(guī)律;最后動(dòng)力部分采用車橋耦合模型,其中車輛采用6參數(shù)2自由度的1/4車輛模型,主要分析了車輛行駛過程中簡(jiǎn)支和連續(xù)斜交箱梁橋的不利截面在三種不同的行車位置、三種不同軸重、六種不同行車速度等參數(shù)變化時(shí)的畸變效應(yīng)變化規(guī)律:簡(jiǎn)支斜交箱梁橋和三跨連續(xù)斜交箱梁橋的畸變效應(yīng)有一定的差異;在簡(jiǎn)支斜交箱梁橋中,3/4跨截面為畸變效應(yīng)的不利截面,隨著參數(shù)的變化,可以看出斜度、行車速度、預(yù)應(yīng)力水平、寬跨比對(duì)畸變效應(yīng)的影響較大;在三跨連續(xù)斜交箱梁橋中,各跨的中部截面畸變效應(yīng)較為明顯,不同的參數(shù)變化對(duì)不利截面的影響存在一定的差異。其中,各跨中部截面畸變角曲線隨車速和行車位置不同變化的不是很明顯。
[Abstract]:The section shape of box girder is geometric variable, so the section of box girder not only produces rigid torsion but also produces distortion under the action of partial load or antisymmetric load. At present, domestic and foreign scholars have done a lot of research on the theoretical calculation method of the distortion angle and stress of the orthogonal box girder bridge, and have obtained the corresponding results. However, there are few researches on the distortion effect of skew bridge, so the variation law of distortion effect of skew box girder bridge under static and dynamic loads is analyzed in this paper. The models of simply supported and three-span continuous skew box girder bridges are established by using large-scale software ANSYS. Firstly, the longitudinal distortion effect of simply supported and continuous skew box girder bridges under deadweight is analyzed and the most unfavorable section is obtained. Then, a series of box girder models are established in the static part. The longitudinal variation law of the distortion angle at the junction of the web and the roof is analyzed. Finally, the vehicle-bridge coupling model is used in the dynamic part, in which the vehicle adopts a 1 / 4 vehicle model with 6 parameters and 2 degrees of freedom. In this paper, the unfavorable cross sections of simply supported and continuous skew box girder bridges are analyzed in three different driving positions and three different axle loads. There are some differences in the distortion effect between the simply supported skew box girder bridge and the three span continuous skew box girder bridge, and the 3 / 4 span section of the simply supported skew box girder bridge is the unfavorable section of the distortion effect. With the change of parameters, it can be seen that the distortion effect of slope, driving speed, prestress level, width span ratio is greater than that of three-span continuous skew box girder bridge, and the distortion effect of middle section of each span is more obvious in three-span continuous skew box girder bridge. There are some differences in the influence of different parameters on the unfavorable section. Among them, the distortion angle curve of the middle section of each span is not obvious with different speed and driving position.
【學(xué)位授予單位】：石家莊鐵道大學(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)期刊論文 前4條

1 張文獻(xiàn);龐姝;黃金芬;張唯春;;大翼緣箱梁畸變效應(yīng)的試驗(yàn)研究[J];東北大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年07期

2 徐勛;強(qiáng)士中;;薄壁箱梁畸變分析理論的研究[J];工程力學(xué);2013年11期

3 秦順全;分析箱梁扭轉(zhuǎn)的矩陣位移法[J];橋梁建設(shè);1990年01期

4 段立華;秦順全;陳列;;梯形截面箱梁的約束扭轉(zhuǎn)計(jì)算[J];西南交通大學(xué)學(xué)報(bào);1988年04期

，

本文編號(hào)：1833553