【作者】 李慧华；

【导师】 周绪红； 狄谨；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2010， 硕士

【摘要】 本文由国家自然科学基金项目(50608005)资助,对薄壁扁平钢箱梁的计算方法进行研究。薄壁扁平钢箱梁由于其优越的抗弯、抗扭及抗剪性能,被广泛运用于大跨度斜拉桥、悬索桥和拱桥中。总结了前人的研究成果,论述了薄壁杆件理论和初等梁理论,详细介绍了桥面板计算分析的弹性薄板理论、等效格子梁法及P-E法等计算方法。以青岛海湾大桥红岛航道桥为依托工程,建立斜拉桥空间杆系有限元模型,对全桥进行整体受力分析。结果表明,全桥受力合理,主梁应力未超过钢材容许应力。在汽车荷载作用下,主梁最大竖向位移为146.98mm,满足设计要求。通过四组模型,分析了横隔板间距对顶板横向受力性能的影响。当横隔板间距在一定范围内变化时,顶板的最大横向应变随横隔板间距的减小而减小。采用钢箱梁节段模型板壳单元有限元法细致地分析了横隔板的受力特性,表明横隔板与箱梁其他板件连接处出现应力集中,其余区域的应力分布相对均匀。分析了在不同的支承条件下梁高对钢箱梁顶板受力性能的影响,结果表明,钢箱梁的梁高对桥面板横向受力影响不明显；通过对比分析,认为桥面铺装对桥面板横向受力影响显著。比较了混合有限元模型、节段有限元模型和应力叠加法在相同工况下计算出的桥面板应力计算结果,表明混合有限元方法最适于模拟钢箱梁桥面板。更多还原

【Abstract】 Under the commission of the National Natural Science Foundation of China (50608005), the calculational method of thin walled flat steel box girder was studied. As stiffened girder of modern long-span bridges with cable system, the thin-walled flat steel box girder had numerous advantages, such as good torsional stiffness, lateral bending stiffness, excellent wind resistance, etc. Therefore, it has been widely used in long-span cable-stayed bridges, suspension bridges, as well as arch bridges.The author summarized the previous researches, and presented the theory of thin walled bar and general beam theory, as well as elastic thin plate theory, equivalent lattice beam method,and P-E method.On the basis of Hongdao channel bridge of Qingdao bay bridge, spacial pole system finite element model was created to analyse the globle performance of steel box girder. The result showed that the behavior of the bridge was reasonable, the stress in main girder didn’t beyond the steel allowable stress.Under the vehicle load, the deformation of main girder was 146.98mm which met the designing requirement.Four models were used to study the influence of diaphragms spacing on top plate.The resulted showed that when the diaphragm spacing was within certain scope, the maximum transverse strain on the top plate decreased with the spacing decreasing. The behavior of diaphragm was studied with the Box girder section model.Stresses in diaphragms were fairly well-distributed on the diaphragm, except the joint areas with other plates.This dissertation also studied the influence of girder height under different support condition on transverse strain of top plate. The result showed the height of girder didn’t act obviously effect on the transverse strain. The result of compared analysis showed the pavement acted an important role on the transverse behaviour. Compared with shell finite element model, and the stress superposition method, the mixing finite element model method was sugguested to simulate the performance of the deck.更多还原