钢桁梁桥高强螺栓连接的传力性能研究

发布时间：2018-06-14 23:32

本文选题：摩擦型高强螺栓 + 螺栓缺失　；参考：《石家庄铁道大学》2014年硕士论文

【摘要】：近年来随着重载列车的运行，使得既有铁路钢桥的各种病害仍时有发生，严重影响了桥梁的使用寿命和行车安全性。本文依托铁道部资助项目《重载列车作用下既有钢桁梁桥的检测评估与病害整治技术研究》(2011G016-C)，以新兖线上行长东黄河桥钢桁梁连续梁部分每年维修更换大约1200条折断的高强度螺栓为背景，利用ANSYS软件建立有限元模型，分析螺栓破坏或缺失对钢桁梁桥的影响，，主要结论如下： (1)螺栓缺失对短列摩擦型高强螺栓接头传力比和拼接板应力造成的影响分别局限在2倍和1倍螺栓间距范围之内，但会造成缺失排剩余螺栓摩擦力增大，传力比增加；在螺栓缺失处，拼接板应力明显减小，但未缺失处应力没有明显改变，芯板应力沿轴向和横向均有所增加，但变化不大； (2)短列摩擦型高强螺栓接头各排螺栓随荷载的增加依次出现滑移，传力比较大螺栓排首先出现滑移；螺栓缺失后，当所加荷载值较小时，各排螺栓的传力比保持开始的变化值不变，当荷载继续增加时，传力比的变化值也随之变化，剩余的螺栓按传力大小依次出现滑移； (3)长列摩擦型高强螺栓接头在轴力作用下各排传力比呈马鞍型分布，但实际节点板中由于螺栓排列的不均匀，会导致个别位置传力比有突变；在螺栓连接的计算中应考虑一排内螺栓传力的不均匀性； (4)长列摩擦型高强螺栓接头每排螺栓的单个螺栓滑移顺序不一致，靠近板中线的螺栓滑移量比较大，依次向板的边缘减小；无缺失状态下，各排螺栓沿板宽度方向所传剪力并不均匀，由板中间向两边递减，进入局部滑移状态后，剪力沿宽度方向的不均匀性增加，该排螺栓全面滑移后达到均匀分布。
[Abstract]:In recent years, with the operation of heavy-haul trains, various diseases of existing railway steel bridges still occur from time to time, which seriously affect the service life and safety of the bridges. This paper relies on the project supported by the Ministry of Railways < Detection, Evaluation and Disease treatment Technology of existing Steel Truss Bridges under the Action of heavy haul Train "2011G016-C, about 1200 fold of steel truss girder continuous beam maintenance and replacement each year by the Governor of the New Yanline East Yellow River Bridge Broken high strength bolts for the background, The finite element model is established by using ANSYS software to analyze the influence of bolt failure or loss on steel truss bridge. The main conclusions are as follows: (1) the effect of bolt deficiency on the transmission ratio of short row friction high strength bolt joint and the stress of splice plate are limited within the range of 2 times and 1 times of bolt spacing, respectively. However, the friction force of the missing residual bolt increases and the transfer force ratio increases; at the lack of bolt, the stress of the splice plate decreases obviously, but the stress of the unmissing plate does not change obviously, and the stress of the core plate increases along the axis and lateral direction, but the change is not obvious. (2) the slippage of each row bolt in short row friction type high-strength bolt joint is followed by the increase of load, and the slip occurs first in the larger bolt row with higher load transfer, and after the bolt is missing, when the load value is small, The load transfer ratio of each row of bolts remains unchanged at the beginning, and when the load continues to increase, the change value of the transmission force ratio also changes, and the remaining bolts slip according to the magnitude of the transmission force. (3) the load transfer ratio of long row friction type high strength bolt joint under axial force is a saddle type distribution, but in the actual joint plate, because of the uneven arrangement of bolts, it will lead to sudden change of transmission force ratio in individual position. In the calculation of bolt connection, the inhomogeneity of internal bolt transmission should be taken into account. (4) the slip sequence of single bolt in each row of long row friction type high strength bolt joint is inconsistent, and the slip amount of bolt near the middle line of plate is relatively large. The shear force propagated along the width direction of the plate was not uniform, but decreased from the middle of the plate to the two sides, and the non-uniformity of the shear force along the width direction increased after entering the local slip state. After the row bolt slips, it reaches uniform distribution.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.36

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