摘要
悬索桥桥塔作为一种高耸结构,当处于自立状态时,桥塔缺少缆索体系约束,刚度较低,桥塔风致振动问题便是设计的关键因素之一。以在建的郭家沱大桥为例,采用气弹模型风洞试验,研究了桥塔自立状态下的抗风性能。结果表明,桥塔自立状态下:1)在均匀流场和紊流场中,均没有发生驰振现象;2)塔顶的位移响应随风偏角的增大呈非单调变化。当风偏角是0°、15°、30°时,塔顶的顺桥向位移最大;当风偏角为60°时,塔顶的横桥向位移和扭转角最大。
The pylon of the suspension bridge is a tall structure. When it is free standing,it lacks the constraints of the cable system,so the stiffness of the pylon is lower,and the wind-induced vibration of the pylon becomes one of the key factors in the design. Taking Guojiatuo bridge as an example,the aeroelastic model wind tunnel testing is used to study the wind resistant performance of the pylon under free-standing condition. The results show that under the free-standing condition（ 1） the pylon has no obvious galloping in the uniform flow field and the turbulent flow;（ 2） the response of the pylon increasing with the wind yaw angle is not monotonous,and the longitudinal response on the top of the pylon reaches the maximal value at 0°,15° and 30° of the wind yaw angle,and the lateral response and the twist angle on the top of the pylon reaches the maximal value at 60° of the wind yaw angle.
作者
李佑
崔睿博
郭向荣
何旭辉
LI You1;CUI Ruibo2;GUO Xiangrong2;HE Xuhui2
出处
《公路交通技术》
2018年第3期33-38,共6页
Technology of Highway and Transport
基金
国家重点研发计划资助项目(2017YFB201204)
国家自然科学基金资助项目(51508580
U1534206)
关键词
悬索桥
桥塔
自立状态
风致振动
风洞试验
均匀流
紊流
suspension bridge
bridge pylon
free-standing
wind-induced vibration
wind tunnel tests
uniform flow
turbulent flow
