摘要
为探究下承式碳纤维复合增强材料(carbon fiber reinforced polymer,CFRP)拱桥的动力特性,以国内某下承式拱桥为研究背景,建立ANSYS有限元模型,按吊杆极限拉力相等原则将钢吊杆替换成CFRP吊杆进行车辆荷载动力特性及响应分析。研究结果表明:替换后的CFRP吊杆拱桥的一阶自振振型与钢吊杆拱桥的相同,均为拱肋一阶对称侧弯和主梁一阶反对称竖弯,且两者的拱肋一阶自振频率仅相差0.24%、主梁一阶自振频率仅相差0.07%;在车辆荷载作用下,靠近加载车道一侧吊杆的应力峰值是远离加载车道一侧吊杆的3倍以上,吊杆的动力响应与车辆加载位置有关;当车辆荷载相同时,CFRP吊杆与钢吊杆的应力时程响应变化规律一致,但CFRP吊杆的应力峰值一般比钢吊杆的大10%左右。与钢吊杆拱桥相比,CFRP吊杆拱桥的动力性能未发生很大的变化,但由于CFRP材料具有高强、轻质、耐腐蚀的特点,CFRP吊杆有望从根本上解决钢吊杆易腐蚀、易断裂的问题。
To explore the dynamic characteristics of through arch bridges using carbon fiber reinforced polymer(CFRP),a through arch bridge in China was taken as the research background,and its ANSYS finite element model was established.According to the principle of equal ultimate tension of suspenders,steel suspenders were replaced by CFRP suspenders to analyze the dynamic characteristics and response of CFRP suspenders under the vehicle load condition.The results show that the first-order natural vibration mode of the arch bridge with CFRP suspenders is the same as that of the arch bridge with steel suspenders,which is first-order symmetrical lateral bending of arch rib and first-order antisymmetric vertical bending of main beam.The difference between the first-order natural frequencies of their arch ribs is only 0.24%,and that for their main beam is only 0.07%.Under vehicle load,the peak stress of the suspenders near the loading lane is more than three times that of the suspenders far away from the loading lane,and the dynamic response of the suspenders is related to the loading position of the vehicle.Under the same vehicle load condition,the CFRP suspenders and the steel suspenders exhibit a consistent change law of the time-history response of stress,but the stress peak of the CFRP suspenders is generally 10%larger than that of the steel suspenders.While the arch bridge with CFRP suspenders does not show largely different dynamic performance compared with the arch bridge with steel suspenders,CFRP suspenders are expected to fundamentally solve the problems of corrosion and fracture faced by steel suspenders due to the characteristics of high strength,light weight,and corrosion resistance of CFRP.
作者
蒋田勇
余东海
马亚飞
戴理朝
JIANG Tianyong;YU Donghai;MA Yafei;DAI Lizhao(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China)
出处
《交通科学与工程》
2024年第6期49-58,共10页
Journal of Transport Science and Engineering
基金
国家重点研发计划项目(2019YFC1511002)
国家自然科学基金项目(51778068、52078058)
湖南省自然科学基金创新研究群体项目(2020JJ1006)
湖南省自然科学基金项目(2019JJ40301)
湖南省教育厅自然科学研究重点项目(21A0196)。
关键词
下承式拱桥
CFRP吊杆
车辆荷载
应力时程响应
有限元分析
through arch bridge
CFRP suspender
vehicle load
time-history response of stress
finite element analysis
