摘要
对典型流线型闭口箱梁断面的风荷载效应进行同步测压风洞试验,比较了来流平均风速、湍流度、风攻角、展向间距等不同参数条件下风荷载在空间分布状况,对风速及其荷载效应的空间相关性进行深入研究,从时、频域两个方面来尝试分析现象及原因,探讨影响因素,证实升力、扭矩的展向相关性远大于风速、阻力的相关性,并发现升力与扭矩的相关性规律相似,风速与阻力相关性规律相似;验证了传统随机抖振动气动力理论所存在的不足。
The simultaneous measurement of wind load pressures on a streamline closed box girder＇s cross-section was conducted with pressure scanning valves in Tongji University wind tunnel,the spatial distribution states of wind load were compared,the reasons for the phenomena were explored,under different wind average speed,turbulence intensity,wind attack angle and span-wise distance.The spatial correlation between wind speed and its load effect was studied in both time domain and frequency one.With correlation coefficient and coherence function,the mechanism and influence factors were analyzed.It was elaborated and confirmed that the span-wise correlations of lift force and torsion moment are much greater than those of wind speed and drag force,and there is a similar law to the correlation of lift force and that of torsion moment,a similar law to the correlation of wind speed and that of drag force.The shortcomings of the traditional random aerodynamic buffeting theory were verified.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第2期76-80,114,共6页
Journal of Vibration and Shock
基金
国家自然科学基金委重大研究计划(90715039)
国家科技支撑计划(2008BAG07B02)
关键词
气动力荷载
空间相关性
相干函数
相关系数
湍流
aerodynamic loads
spatial correlation
coherence function
correlation coefficient
turbulence
