摘要
某桥为中承式推力钢箱拱桥,索梁锚固区十字接头承受Z向拉伸,为确认十字接头抗层状撕裂能力,采用有限元法和试验相结合的方法进行研究。计算结果表明:设计荷载下顶板Z向应力远小于材料的屈服应力;试验设计试件的Z向应力与实桥基本一致。试验结果表明:Q345qD钢板具有良好的Z向性能,断面收缩率大于60%,钢材夹杂物数量非常少(等级为1.0级);足尺模型静力和疲劳试验下箱梁顶板没有发生层状撕裂现象。该桥设计所选Q345qD钢材具有较高的抗层状撕裂性能。鉴于我国冶金技术的进步,当结构有Z向性能要求时,建议优先研究使用非Z向钢,以获取良好的经济效益。
A bridge is a half-through steel box thrust arch bridge and the cross joints in the cable-to-girder anchorage zone of the bridge sustain Z-directional tensioning.A combined method of finite element method and tests was taken to determine the lamellar tearing resistant capacity of the cross joints.The results of the calculation show that the Z-directional stress in the top plate of the box girder of the bridge under the designed load is far less than the yield stress of material.The Z-directional stress in the specimens designed for the tests is basically in accord with that in the actual bridge.The results of the tests also show that the Q345qD steel plate has good Z-directional property,the sectional shrinkage ratio is greater than 60% and the amount of impurities in the steel is very little（the grade of the steel is rated 1.0）.The lamellar tearing has not occurred in the top plate either in the static or fatigue tests of full-scale models and the Q345qD steel selected for the bridge has high lamellar tearing resistant property.In view of the progress of the metallurgical technology in China,at the time the structure is required to have Z-directional property,it is suggested that the first priority should be given to the study and application of the non-Z-directional steel for the sake of better economic benefit.
出处
《世界桥梁》
北大核心
2011年第3期53-56,共4页
World Bridges
关键词
拱桥
吊索
十字接头
层状撕裂
有限元法
试验
研究
arch bridge
hanger cable
cross joint
lamellar tearing
finite element method
test
study
