简支斜交桥地震碰撞反应精细化研究

发布时间：2018-05-26 10:21

本文选题：简支斜交桥 + 精细化模型　；参考：《石家庄铁道大学》2015年硕士论文

【摘要】：斜交桥的地震反应与正交桥相比具有特殊性和复杂性,并且斜交桥在历次大地震中遭到了严重破坏。本文采用OpenSees软件建立考虑碰撞过程中摩擦作用的简支斜交桥精细化三维点—面碰撞模型,并分析了水平地震动输入方向、斜度、竖向地震动等参数对简支斜交桥地震碰撞反应的影响。本文主要内容如下:(1)通过查阅国内外相关文献,对斜交桥的震害、地震碰撞等相关问题进行了系统回顾和总结,详细介绍了斜交桥上部结构建模方法和主要碰撞模型。(2)对本文提出的简支斜交桥点—面碰撞模型进行可靠性验证,并论证其能够精细化模拟地震反应的特点,结果表明:梁端最大碰撞力的产生位置随着斜度的变化而改变;梁端与桥台间的摩擦作用削弱了斜度对梁端锐角处纵向最大位移的影响;不考虑摩擦作用会高估上部结构峰值转角。(3)分析了水平地震动输入方向对简支斜交桥地震碰撞反应的影响,发现:仅考虑梁体与桥台间的纵向碰撞效应时,斜度为?的简支斜交桥的梁端纵向最大位移和上部结构峰值转角最小值出现在地震动输入角度??(90???)左右处;考虑梁体与桥台和横向挡块间的纵、横向联合碰撞效应时,地震碰撞反应变得更加复杂,并且斜度越大,复杂程度越高。(4)研究了考虑水平地震动输入方向时斜度对简支斜交桥地震碰撞反应的影响,结果表明:仅考虑梁体与桥台间的纵向碰撞效应时,梁端纵向最大位移和上部结构峰值转角随斜度增大而增大;考虑梁体与桥台和横向挡块间的纵、横向联合碰撞效应时,梁端纵向最大位移随斜度增大而增大,峰值转角随斜度增大呈先增大后减小的趋势。(5)对竖向地震动在简支斜交桥地震反应中的作用进行了分析探讨,发现竖向地震动对支座上拔力和考虑支座滑移时的地震碰撞反应均有一定影响。
[Abstract]:Compared with the orthogonal bridge, the seismic response of the skew bridge is special and complex, and the skew bridge has been seriously damaged in the past major earthquakes. In this paper, OpenSees software is used to establish a fine three-dimensional point-plane collision model of a simply supported skew bridge considering the friction action during the collision process, and the input direction and slope of horizontal ground motion are analyzed. Effect of vertical ground motion and other parameters on seismic collision response of simply supported skew bridge. The main contents of this paper are as follows: (1) by consulting the relevant literature at home and abroad, the paper systematically reviews and summarizes the earthquake damage, earthquake collision and other related problems of the oblique bridge. This paper introduces the method of superstructure modeling and the main impact model of skew bridge in detail. It verifies the reliability of the point-plane collision model of simply supported skew bridge, and proves that it can simulate the seismic response finely. The results show that the position of the maximum impact force at the end of the beam changes with the change of the slope, and the friction between the end of the beam and the abutment weakens the influence of the slope on the longitudinal maximum displacement at the sharp angle of the beam end. The influence of the input direction of horizontal ground motion on the seismic collision response of simply supported skew bridge is analyzed. It is found that when only the longitudinal collision effect between beam body and abutment is considered, the slope is? The maximum longitudinal displacement at the beam end and the minimum peak rotation angle of the superstructure of the simply supported skew bridge appear at the input angle of ground motion On the left and right, the seismic collision response becomes more complicated when the longitudinal and transverse collision effect between the beam body and the abutment and the transverse block is considered, and the larger the slope is, The effect of slope on seismic collision response of simply supported skew bridge is studied when the input direction of horizontal ground motion is considered. The results show that only the longitudinal collision effect between beam body and abutment is considered. The maximum longitudinal displacement at the end of the beam and the peak angle of the superstructure increase with the increase of the slope, and the maximum longitudinal displacement of the end of the beam increases with the increase of the slope when the longitudinal and transverse collision effect between the beam body and the abutment and the transverse block is considered. The effect of vertical ground motion on the seismic response of simply supported skew bridges is analyzed and discussed. It is found that the vertical ground motion has some influence on the uplift force and the seismic collision response when bearing slip is considered.
【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】：2015
【分类号】：U442.55

【参考文献】