行车荷载作用下曲线箱梁剪力滞效应试验研究

发布时间：2018-03-03 00:18

本文选题：曲线箱梁　切入点：行车荷载　出处：《武汉工程大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,曲线箱梁桥已经被广泛的应用到工程实践中。而在箱梁中,剪力滞效应的研究是该领域内的一个重要组成部分。众所周知,由于箱梁中剪力滞效应的忽视已经给人类社会带来了巨大灾难和财产的损失。同时,曲线箱梁的弯扭耦合效应使得其剪力滞效应分布规律更为复杂。已有的文献中,曲线箱梁剪力滞的静力研究较为广泛,而动载研究鲜有报道。因此,本文致力于动荷载作用下曲线箱梁剪力滞效应的分析。选取了行车荷载作为研究对象,运用大型通用有限元软件ANSYS建模进行数值分析进而制作了有机玻璃模型进行试验分析。本文的研究结果具有重要的理论研究意义和工程应用价值。本文主要内容归纳如下:⑴介绍了动荷载作用下曲线箱梁剪力滞问题的研究意义和主要研究方法,重点介绍了近年来动载下剪力滞效应的研究成果。阐述了有限元法中关于动力学方面的相关理论,如瞬态动力学,行车荷载的简化以及有限元法单元的选取等。⑵采用大型通用有限元软件ANSYS研究分析了行车荷载作用下曲线箱梁剪力滞效应的影响参数,包括行车荷载大小、速度和作用的位置以及行车简谐荷载和恒载的比较,简支约束和固支约束的比较。然后,建立了悬臂曲线箱梁模型进行分析,得出该条件下曲线箱梁的动剪力滞效应分布规律。结果表明:行车荷载速度、作用位置以及支撑约束的改变对结构上的剪力滞效应影响较大。⑶通过对悬臂有机玻璃曲线箱梁的行车荷载模型试验以及数值分析,得出了行车荷载作用下悬臂曲线箱梁的剪力滞效应分布规律。结果表明:在行车荷载作用下,结构上顶板与腹板交接处多呈现正剪力滞效应,不同截面上的剪力滞效应分布有明显的差异。有限元分析值与试验结果趋势上基本吻合,验证了有限元法的可靠性。
[Abstract]:At present, curved box girder bridge has been widely used in engineering practice. In box girder, the study of shear lag effect is an important part in this field. The neglect of shear lag effect in box girder has brought great disaster and property loss to human society. At the same time, the coupling effect of bending and torsion of curved box girder makes the distribution of shear lag effect more complicated. The static research on shear lag of curved box girder is extensive, but the study of dynamic load is seldom reported. Therefore, this paper is devoted to the analysis of shear lag effect of curved box girder under dynamic load. Numerical analysis was carried out by using large-scale general finite element software ANSYS to model and then the PMMA model was made for experimental analysis. The research results in this paper have important theoretical significance and engineering application value. The main contents of this paper are as follows: 1. The research significance and main research methods of shear lag of curved box girder under dynamic load are summarized as follows: 1. The research results of shear lag effect under dynamic load in recent years are emphatically introduced, and the related theories about dynamics in finite element method, such as transient dynamics, are expounded. The simplified driving load and the selection of finite element method (FEM) elements are used to study and analyze the influence parameters of the shear lag effect of curved box girder under driving load, including the size of driving load, by using the large and universal finite element software ANSYS. The velocity and action position, the comparison of harmonic load and dead load, the comparison of simple support constraint and clamping constraint, and the analysis of cantilever curved box girder model are established. The distribution law of dynamic shear lag effect of curved box girder under this condition is obtained. The shear lag effect of the structure is greatly influenced by the change of the action position and the bracing constraint. 3. Through the model test and numerical analysis of the driving load of the cantilever plexiglass curved box girder, The distribution law of shear lag effect of cantilever curved box girder under traffic load is obtained. The results show that under the action of driving load, there is a positive shear lag effect at the junction of roof and web plate on the structure. The distribution of shear lag effect on different sections is obviously different. The results of finite element analysis are in good agreement with the trend of test results, which verifies the reliability of the finite element method.
【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.213

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