作　　者： ; ;

机构地区： 同济大学土木工程学院土木工程防灾国家重点实验室

出　　处： 《同济大学学报（自然科学版）》 2008年第8期1040-1044,共5页

摘　　要： 基于一钢质天线气动弹性模型风洞试验结果,研究了其风致疲劳.首先,根据当地气象站资料统计的风速风向联合概率分布函数求得天线结构所在位置处的风速风向联合概率分布函数,并以结构假定的疲劳寿命为最大风速重现期来计算每个风向区间要考虑的最大风速.其次,对天线结构的气动弹性模型进行风洞试验,测得天线结构在不同风向角、不同风速下的加速度响应,根据试验获得的结构响应,求得疲劳分析关键点处的应力响应功率谱.最后,基于疲劳累积损伤理论在频域上用等效窄带方法计算天线结构的疲劳寿命,结果表明,这一实际结构的风振疲劳寿命接近主楼结构的设计寿命. The paper presents a study of the fatigue damage caused by wind actions of a real steel antenna. Based on the wind data obtained from the local meteorological observatory, the joint probability distribution model of wind speed and corresponding direction is first derived. The maximum wind speed for a given wind direction is determined according to the assumed fatigue life of the structure as the return period. The aeroelastic full antenna model is then tested in a wind tunnel,and the wind induced vi- bration responses are accordingly recorded at different wind speeds and wind directions. The power spectra of the stress responses at critical points are obtained on the basis of the responses. Finally, the accumulated fatigue life is calculated in frequency domain by using equivalent narrow band method. The results indicate the fatigue life of the antenna is close to the designed life of the building.

关 键 词： 钢质天线 风振疲劳 风洞实验 气动弹性模型

领　　域： [建筑科学]