【作者】 韩冰； 王生武； 江阿兰；

【Author】 HAN Bing;WANG Sheng-wu;JIANG A-lan;School of Civil and Safety Engi.Dalian Jiaotong Univ.;

【机构】 大连交通大学土木与安全工程学院；

【摘要】 大跨度钢桁架桥,节点处焊缝密集,类型多样,疲劳破坏是最主要的破坏形式。结合南昌某下承式钢桁架桥的具体设计,建立全桥有限元模型。依据设计说明文件选择标准疲劳车进行加载,通过有限元分析结果得到疲劳危险节点。根据节点构造及受力状态,制定试验方案,对桥的跨中横梁与主弦的连接节点进行1:4缩尺,合理化设计试验模型,建立节点有限元模型,据分析结果进行节点疲劳试验。根据列车时刻表估算设计寿命,通过规范验证该结构的疲劳强度符合设计要求。更多还原

【Abstract】 For large-span steel truss bridge, the node fatigue failure is the main failure mode of dense node at the weld because of weld various types. Combining specific design of The Nanchang through steel truss bridge, the full-bridge finite element analysis model is established. Based on the design documentation, select the fatigue loading car, then, according to the results of the analysis, find the risk of fatigue node. Rationalizing the design of test model, build the node finite element analysis model, develop a pilot program. Finally, start the steel truss bridge across the crossbar main truss bottom chord connection node 1:4 scale nodes fatigue test. Estimated the design life according to the Nanchang train schedule, verify that the fatigue strength of the structure and specifications meet the design requirements.更多还原