【摘要】：城市化的發(fā)展促使城市交通流量日益增加,設(shè)計(jì)道路車流量的增加給路線中的橋梁結(jié)構(gòu)設(shè)計(jì)提出了新的要求。彎梁結(jié)構(gòu)在城市高架橋梁中占有較大比例,是城市橋梁的重要組成部分。彎梁結(jié)構(gòu)的連結(jié)作用將彼此分離的各方向道路連為一體。彎箱梁結(jié)構(gòu)較直線箱梁結(jié)構(gòu)受力更為復(fù)雜,橋梁計(jì)算的空間效應(yīng)更為明顯。彎箱梁結(jié)構(gòu)即使在無(wú)偏心荷載作用下,除產(chǎn)生彎矩、剪力效應(yīng)外,尚且產(chǎn)生一定量值的扭矩。過(guò)大的扭矩效應(yīng)容易在靠近支座的截面突變位置產(chǎn)生斜向裂縫,從而降低結(jié)構(gòu)安全性能。多格室曲線彎梁結(jié)構(gòu)除上述較為突出的扭轉(zhuǎn)效應(yīng)外,還存在因荷載的偏心加載對(duì)箱梁各道腹板的產(chǎn)生較大受力偏差影響的偏載效應(yīng)。箱梁結(jié)構(gòu)空間傳力的復(fù)雜性導(dǎo)致最終的應(yīng)力計(jì)算結(jié)果與普通直線箱梁結(jié)構(gòu)存在很大不同。基于此本文開展以下研究工作：1、彎梁結(jié)構(gòu)通常在各支點(diǎn)位置設(shè)置較為強(qiáng)大的橫梁結(jié)構(gòu)。橫梁結(jié)構(gòu)的存在使得彎梁結(jié)構(gòu)在扭轉(zhuǎn)荷載作用下變現(xiàn)為約束扭轉(zhuǎn)。約束扭轉(zhuǎn)作用下結(jié)構(gòu)附加產(chǎn)生翹曲雙力矩,自由扭矩及約束扭矩。本文對(duì)彎梁結(jié)構(gòu)恒活載作用下約束扭轉(zhuǎn)內(nèi)力效應(yīng)及應(yīng)力效應(yīng)進(jìn)行計(jì)算,并對(duì)影響約束扭轉(zhuǎn)效應(yīng)的結(jié)構(gòu)彎曲半徑因素、橋梁格室數(shù)量因素進(jìn)行分析。2、彎梁結(jié)構(gòu)在偏心荷載作用下,其偏載效應(yīng)較為復(fù)雜。通過(guò)采用不同的計(jì)算方法,定義不同的比值系數(shù),對(duì)彎梁結(jié)構(gòu)恒活載的偏心效應(yīng)進(jìn)行分析。最后對(duì)彎梁結(jié)構(gòu)的彎曲半徑、活載加載的偏心距離對(duì)偏心效應(yīng)的影響進(jìn)行了分析。3、彎梁結(jié)構(gòu)復(fù)雜的力學(xué)特性使得對(duì)結(jié)構(gòu)外加荷載作用下的應(yīng)力結(jié)果難以準(zhǔn)確計(jì)算。單純的采用用于普通直梁應(yīng)力計(jì)算的方法對(duì)多格室彎梁結(jié)構(gòu)進(jìn)行計(jì)算,所得計(jì)算結(jié)果往往不能反應(yīng)結(jié)構(gòu)真實(shí)的應(yīng)力狀態(tài)。采用空間網(wǎng)格模型能夠綜合考慮彎梁結(jié)構(gòu)的各項(xiàng)效應(yīng),輸出的計(jì)算結(jié)果也更為全面更為精細(xì)。
[Abstract]:With the development of urbanization, urban traffic flow is increasing day by day, and the increase of road traffic flow puts forward new requirements for the design of bridge structure in the route. Curved beam structure is an important part of urban bridge because it occupies a large proportion of urban viaducts. The connection of the curved beam structure will be separated from each other in each direction of the road as a whole. The bending box girder structure is more complicated than the straight box girder structure, and the spatial effect of bridge calculation is more obvious. Even if there is no eccentric load, the bending box girder structure produces not only bending moment and shear effect, but also a certain amount of torque. The excessive torque effect is easy to produce oblique cracks near the abrupt position of the section near the support, thus reducing the safety performance of the structure. In addition to the torsional effect mentioned above, there is also a bias load effect due to the eccentric loading on the web of the box girder. Due to the complexity of spatial force transfer of box girder structure, the final stress calculation result is very different from that of ordinary straight box girder structure. Based on this, the following research work is carried out: 1. The bending beam structure usually has strong cross beam structure at each fulcrum. Due to the existence of beam structure, the bending beam structure is turned into constrained torsion under torsional load. Under the constraint torsion, the additional warpage torque, free torque and restrained torque are generated. In this paper, the effect of restrained torsional internal force and stress on the bending beam structure under dead load is calculated, and the factors affecting the bending radius of the structure and the number of the lattices of the bridge are analyzed. 2, the bending beam structure is subjected to eccentric load. The bias effect is complex. The eccentricity effect of dead load of curved beam structure is analyzed by using different calculation methods and defining different ratio coefficients. Finally, the influence of bending radius and eccentricity of live load on eccentricity is analyzed. 3. The method used to calculate the stress of the ordinary straight beam is used to calculate the multi-cell curved beam structure. The calculated results often can not reflect the true stress state of the structure. The effects of bending beam structure can be considered synthetically by using the spatial grid model, and the output results are more comprehensive and precise.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U448.213

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 譚上俞;梁月華;陶慶東;肖盛燮;;基于梁格理論的梁式橋計(jì)算模型簡(jiǎn)化方法[J];重慶交通大學(xué)學(xué)報(bào)(自然科學(xué)版);2012年03期

2 何柏雷;“太陽(yáng)把橋曬跑了?”——深圳市某立交A匝道橋事故分析[J];城市道橋與防洪;2002年02期

3 劉德華;金偉良;劉斌;張玉香;;獨(dú)柱墩曲線梁橋中的支座分析[J];南京理工大學(xué)學(xué)報(bào)(自然科學(xué)版);2006年01期

4 強(qiáng)士中,李喬;關(guān)于閉口薄壁桿件約束扭轉(zhuǎn)的周邊不變形理論[J];橋梁建設(shè);1985年01期

5 郭金瓊,房貞政,羅孝登;箱形梁橋剪滯效應(yīng)分析[J];土木工程學(xué)報(bào);1983年01期

6 徐棟;徐方圓;趙瑜;項(xiàng)海帆;;箱梁結(jié)構(gòu)完整驗(yàn)算應(yīng)力和空間網(wǎng)格模型[J];土木工程學(xué)報(bào);2014年05期

，

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