【作者】 王旭；

【导师】 魏炜； 张泳；

【作者基本信息】 长安大学 ， 建筑与土木工程（专业学位）， 2015， 硕士

【摘要】 近年来,随着我国高速公路的快速发展,立体交叉在高速公路上屡见不鲜,但由于立交匝道的平曲线半径限制,大多数立交上的匝道桥梁只能采用现浇弯箱梁,而设计者在桥梁上部结构的计算分析中往往以直代曲,用直桥模型来简要代替弯桥模型,从而大大减小了设计难度和工作量。以延至吴高速公路招安立交E匝道上一座中桥的实际工程为背景,用有限元软件分别建立相同跨径相同尺寸的单梁直线模型、梁格法直线模型以及梁格法曲线模型,并且配置同样的钢束和同样的普通钢筋。并对各模型在车辆荷载、温度效应以及最不利荷载组合下箱梁支点处的支座反力,跨中位置的内力和变形,以及支点处的内力和变形作以对比分析;并且将各个模型下PCS设计验算中的验算结果作以比较,从实际的对比结果中总结经验,得出直线模型和曲线模型以及单梁模型和梁格法模型结果的差异大小,并对在设计过程中需要注重的问题作以概括,为今后设计者在斜弯桥的设计中提供参考。更多还原

【Abstract】 Recently, with the rapid development of high way in China, interchange on the highway also can be seen everywhere, but due to the limitation of the radius of the level curves of interchange ramp bridge of interchange ramp, most of the bridge on the ramp only can be designed to cast-in-situ box girder. And designers in the analysis of the superstructure of the bridge often replacing curve by straight line. With a straight bridge model instead of curved bridge model, thus they can reducing the difficulty and workload greatly.The author takes the cast-in-situ box girder as the basis, and establish the single beam model, the straight beamgrillage model, the bending beamgrillage model of the same span, the same size with finite element software, and configure the same prestressed steel beam and the same steel. Then compare the force of support,the internal force and deformation in the middle, and the internal force and deformation in the support under the moving load, the effect of temperature, the worst load combination. And compare the results of the PSC checking calculation, then sum up the experience from it, so we can get the difference between linear model and curve model, single beam model and grillage method model, and generalize from it, providing reference to designers in thedesign of oblique and curved bridge for future更多还原