桥面铺装对正交异性钢桥面板疲劳性能的影响

发布时间：2018-01-23 01:01

本文关键词： 正交异性板桥面疲劳铺装荷载模型　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：分析国内外钢桥规范对于疲劳设计的规定,应用疲劳寿命评估方法和设计理论,选取城市桥梁中常用的不同铺装体系、沥青铺装的不同刚度并研究正交异性钢桥面板的构造细节对其受力状态及疲劳性能的影响,主要内容有： (1)对低应力幅问题的处理,欧洲规范的规定相对合理,既考虑低应力幅的损伤作用又不扩大它的作用；关于疲劳荷载谱的研究,分析国外规范中符合其国情的疲劳荷载谱,为我国钢桥规范尚未明确的疲劳荷载谱的制定提供参考。 (2)相比沥青铺装,RPC(活性粉末混凝土)铺装体系能明显改善钢桥面板的受力状态,可大幅提高钢桥面板的疲劳寿命；但焊缝的焊接质量、残余应力等因素严重影响了钢桥面板的疲劳特性,尤其在承受重车及超载车辆作用下,沥青铺装体系的钢桥面板的验算细节寿命不足20年。 (3)正交异性钢桥面板验算细节的应力幅随铺装层刚度的增加而减小,提高铺装层的刚度可以明显降低验算细节的应力幅,尤其是对与铺装直接接触的验算细节降低程度更加显著。 (4)与公路车辆荷载相比,城-A车辆荷载作用下纵肋对接焊缝和纵肋与顶板连接焊缝处的等效应力幅较大；而横隔板腹板开孔边缘承受的应力幅则相反,其值受车辆荷载的纵向轴距及相应的轴重影响较大。 (5)分析闭口肋的不同形式及横隔板过焊孔形状等构造细节对桥面板疲劳性能的影响,结果表明：U2形加劲肋的疲劳特性优于U1形,U形肋疲劳特性明显优于V形。
[Abstract]:Absrtact: this paper analyzes the rules of fatigue design of steel bridge codes at home and abroad, and selects different paving systems commonly used in urban bridges by using fatigue life assessment method and design theory. The different stiffness of asphalt pavement and the influence of the construction details of orthotropic steel bridge panel on its stress state and fatigue performance are studied. The main contents are as follows: 1) to deal with the problem of low stress amplitude, the regulation of European Code is relatively reasonable, which not only considers the damage effect of low stress amplitude but also does not enlarge its function; On the research of fatigue load spectrum, the fatigue load spectrum according to its national conditions in foreign codes is analyzed, which provides a reference for the formulation of fatigue load spectrum which has not been defined in the code of steel bridges in China. Compared with the asphalt pavement RPC (reactive Powder concrete) pavement system can obviously improve the stress state of the steel bridge panel and greatly improve the fatigue life of the steel bridge slab; However, welding quality, residual stress and other factors seriously affect the fatigue characteristics of steel bridge panel, especially under the action of heavy and overloaded vehicles. The checking life of steel bridge panels of asphalt paving system is less than 20 years. 3) the stress amplitude of the check details of orthotropic steel bridge panel decreases with the increase of the pavement stiffness, and the stress amplitude of the checking details can be obviously reduced by increasing the stiffness of the pavement. In particular, the degree of reduction of the checking details of direct contact with the pavement is more significant. (4) compared with highway vehicle load, the equivalent stress amplitude of longitudinal rib butt weld and longitudinal rib-roof joint weld is larger under the action of City--A vehicle load. On the other hand, the stress amplitude at the opening edge of the transverse diaphragm web is opposite, and its value is greatly affected by the longitudinal wheelbase of vehicle load and the corresponding axle load. (5) the influence of different types of closed ribs and the shape of overwelded holes on fatigue performance of bridge deck is analyzed. The results show that the fatigue characteristics of the WU2 stiffener is better than that of U1. The fatigue characteristics of U-shaped rib are obviously better than that of V-shaped rib.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.33

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