摘要
光热电站吸热塔高宽比大、频率低、阻尼小,对风荷载非常敏感。以一座243 m高的光热电站混凝土吸热塔为工程背景,采用气弹模型风洞试验方法,对其风致响应规律进行了详细研究。基于相似理论提出了一种吸热塔全气弹模型设计方法,并制作了该吸热塔气弹模型,测试结果表明:该模型的结构阻尼比低至0.3%。然后,进行了详细的气弹模型风洞试验,研究了模型阻尼比对该吸热塔风致响应的影响规律及涡激共振风速和设计风速下结构横风向和顺风向响应规律。结果表明:对该吸热塔,在设计风速范围内会发生明显的涡激共振,涡激共振临界风速为22.1 m/s;阻尼比为0.7%时,出现了明显的涡激共振响应,但当结构阻尼比增大到1.0%及以上时,涡激共振响应不明显。峰值加速度响应的最大值发生在涡激共振风速下的横风向,但峰值基底剪力响应的最大值发生在设计风速下的顺风向。
The solar tower in CSP(concentrating solar power) station is usually characterized by large height-width ratio,low frequency and small damping which makes its response is rather sensitivity to wind loads.In order to study the wind-induced responses laws of the tower,a full-scale aeroelastic model for a 243-meter-high solar tower was designed and manufactured in the paper.Measurements of the model's dynamic response indicated a good simulation of the parameters for the prototype tower and the first-order damping ratio was as low as 0.3%.Then wind tunnel test for the aeroelastic model was conducted,the influence of the damping ratio of the model on the wind-induced responses of the tower was studied,as well as the response laws of the structure in cross-wind and along-wind directions at vortex-induced vibration resonance and design wind speed.The results indicated that vortex-induced resonance occurred significantly at a velocity of about 22.1 m/s for the prototype tower.When the damping ratio was 0.7%,there was an obvious vortex-induced response,however,when the damping ratio of the structure increased to 1.0% or more,the vortex-indused response became less obvious.In addition,the maximum peak acceleration of the tower occurred in the cross-wind direction at the vortex-induced vibration wind speed while the maximum base shear response occurred in the along-wind direction at the design wind speed.
作者
邢国雷
李寿英
吴迎强
刘敏
王勇奉
XING Guoei;LI Shouying;WU Yingqiang;LIU Min;WANG Yongfeng(State Nuclear Electric Power Planning Design and Research Institute Co.,Ltd.,Beijing 100095,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China)
出处
《工业建筑》
北大核心
2023年第6期148-152,160,共6页
Industrial Construction
基金
湖南省教育厅一般项目(19C1660)。
关键词
吸热塔
气弹模型
参数识别
涡激振动
阻尼比
solar tower
aeroelastic model
parameter identification
vortex-induced vibration
damping ratio
作者简介
第一作者:邢国雷,男,1977年出生,硕士,高级工程师;通信作者:刘敏,464933874@qq.com。
