摘要
该文以某斜拉桥为背景,引入基于热点应力的S-N曲线,对重载交通作用下结构疲劳损伤进行了研究。文中通过交通量调查获得共35个交通量样本数据,根据等效损伤原理得到典型疲劳车型和车辆荷载谱,应用Monte-Carlo方法和Miner线性损伤准则计算了典型构造细节的损伤度。为研究重载交通的影响,考虑了各疲劳车型超载一定比例和仅某种车型超载两种情况,探讨了重载交通对结构构件损伤的影响。研究结果表明,按目前的交通状况预测,大桥疲劳寿命满足设计要求,随超载车数量占总交通量比例的增加,构件疲劳损伤度迅速增长,相比其它车型,5轴以上车辆超载时损伤度有了明显的增加。
By the background of a cable-stayed bridge,and introducing the S-N curve based on the hot spot stress,the article studies the fatigue damage of the structure under the action of heavy traffic.According to the investigation of traffic volume,35 sample data of traffic volume are achieved.The typical fatigue vehicle type and the vehicle load spectrum are given by the equivalent damage principle.The typical damage level of structural details is calculated by Monte-Carlo method and Miner linear damage norm.In order to study the influence of heavy traffic,the article considers two situations of a certain proportion of overloads of various fatigue vehicle types and the overload of only one vehicle type,and discusses the influence of heavy traffic on the structural damage.The study result shows that the fatigue life of bridge satisfies the design requirement according to the present forecast of traffic status.With the proportion increment of the overload vehicle quantity in the total traffic volume,the fatigue damage level of the components will rapidly increase.Compared with the other vehicle types,the damage level of more than 5-axis vehicle under the overload will be obviously increased.
出处
《城市道桥与防洪》
2013年第7期287-290,23-24,共4页
Urban Roads Bridges & Flood Control
