波纹钢腹板箱梁桥的温度效应与疲劳性能研究
发布时间：2019-03-24 16:23
【摘要】：在钢桥和组合桥设计时温度效应和疲劳性能都是需要重视的问题。本文从热传导基本方程出发,对变热流作用下的箱梁截面进行全时程分析,计算波纹钢腹板箱梁桥在不同温度场下的温度效应；另外采用有限元程序对桥梁的疲劳特性进行数值模拟,研究主要涉及以下几个方面。 以宁波奉化江大桥为研究背景,采用二维有限元方法分析在7月份桥梁的温度场变化,分析了在不同时刻典型截面顶板、底板和钢腹板的外表面、中部和内表面温度变化特点；再输入数值模拟的温度场结果进行温度效应的分析计算,分析桥梁温度应力的分布特点。将规范温度场的温度效应结果与有限元计算的温度场导致的效应进行分析对比,认为设计上只考虑顶板温度应力时可以采用规范T=25℃的温度场数据。 运用MIDAS/FEA建立奉化江大桥波纹钢箱梁的精细有限元模型,并应用英国规范BS5400和参考文献提供的数据来确定运营阶段内疲劳车辆的荷载谱,最后根据经典的应力-寿命评估方法对该桥运营阶段内钢腹板易损点的疲劳寿命进行评估。根据研究的结果,在疲劳荷载谱作用下,奉化江大桥钢腹板各个位置的易损点在100年设计基准期内产生的累计疲劳损伤度均远小于1。剪力键疲劳损伤出现位置为钢腹板的倾斜面与平直面交界处的钢筋洞口,但在设计基准期内其不会出现疲劳破坏,所以此桥在设计的运营阶段不会出现相关的疲劳破坏。
[Abstract]:In the design of steel bridges and composite bridges, the temperature effect and fatigue performance should be paid attention to. In this paper, based on the basic equation of heat conduction, the full time history analysis of box beam section under the action of variable heat flow is carried out, and the temperature effect of corrugated steel webs box girder bridge under different temperature fields is calculated. In addition, the finite element program is used to simulate the fatigue behavior of the bridge. The research mainly involves the following aspects. Taking the Fenghua River Bridge in Ningbo as the research background, the temperature field of the bridge in July was analyzed by two-dimensional finite element method, and the temperature variation characteristics of the outer, middle and inner surfaces of the typical cross-section roof, bottom plate and steel web at different times were analyzed. The temperature effect is analyzed and calculated by inputting the results of numerical simulation, and the distribution characteristics of the temperature stress of the bridge are analyzed. The results of the temperature effect of the gauge temperature field are analyzed and compared with those of the temperature field calculated by finite element method. It is concluded that the temperature field data of 25 鈩，
本文编号：2446488
[Abstract]:In the design of steel bridges and composite bridges, the temperature effect and fatigue performance should be paid attention to. In this paper, based on the basic equation of heat conduction, the full time history analysis of box beam section under the action of variable heat flow is carried out, and the temperature effect of corrugated steel webs box girder bridge under different temperature fields is calculated. In addition, the finite element program is used to simulate the fatigue behavior of the bridge. The research mainly involves the following aspects. Taking the Fenghua River Bridge in Ningbo as the research background, the temperature field of the bridge in July was analyzed by two-dimensional finite element method, and the temperature variation characteristics of the outer, middle and inner surfaces of the typical cross-section roof, bottom plate and steel web at different times were analyzed. The temperature effect is analyzed and calculated by inputting the results of numerical simulation, and the distribution characteristics of the temperature stress of the bridge are analyzed. The results of the temperature effect of the gauge temperature field are analyzed and compared with those of the temperature field calculated by finite element method. It is concluded that the temperature field data of 25 鈩，
本文编号：2446488
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2446488.html
