摘要
以薄平板、闭口扁平箱梁和开槽扁平箱梁三种断面为研究对象进行小比例尺节段模型悬挂弹簧测振风洞实验,分析了紊流度和断面形式对桥梁振动演化特征和失稳风速的影响.研究结果表明:同一种桥梁断面在不同风场下的振动趋势是一致的,其位移响应均值和发散风不随紊流速度增加而增加;失稳风速从低到高依次为薄平板、闭口箱梁、开槽箱梁,而其失稳突发性从小到大顺序则刚好相反,薄平板和闭口箱梁发散时呈现出典型的硬颤振特征,而开槽箱梁发散时呈现出典型的软颤振特征.
Three kinds of bridge sections such as thin flat,closed flat box girder,and slotted flat box girder were taken as the objects to carry out the vibration measurement tests for their small scale section model with suspension spring system in wind tunnel.The influences of the turbulence intensities and the section types on the bridge vibration evolution characteristics and instability wind speeds were analyzed.The results show that the vibration evolution trends of the same kind of bridge section in different turbulent wind fields are consistent,the mean values of the displacement responses and the instability wind speeds don′t increase with the increase of turbulence.In the three types of cross sections,the instability wind speeds from low to high are as follows：thin plate,closed box girder,slotted box girder,and the order of burst of instability is just the opposite.Flat and closed flat box girder show the characteristics of the typical hard flutter in the divergence,however,slotted flat box girder shows the characteristic of the typical soft flutter in the divergence.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第1期30-34,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学青年基金资助项目(51208524)
中国博士后科学基金资助项目(20100471227)
中南大学首批"创新驱动计划"资助项目(2015CX006)
高铁联合基金重点资助项目(U1534206)
桥梁结构抗风技术交通行业重点实验室开放课题资助项目(KLWRTBMC10-03)
湖南省高校创新平台开放基金资助项目(14K104)
关键词
薄平板
闭口扁平箱梁
开槽扁平箱梁
紊流风场
风致振动特征
失稳风速
thin flat
closed flat box girder
slotted flat box girder
turbulent wind field
wind-induced vibration characteristic
instability wind speed
