桥梁断面表面压力分布及Strouhal数的雷诺数效应  

Reynolds number effect of surface pressure distribution and Strouhal number of a typical bridge deck section

作　　者：刘健新[1] 崔欣[1] 李加武[1] 

机构地区：[1]长安大学公路学院,西安710064

出　　处：《振动与冲击》2010年第4期146-149,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(50578014)

摘　　要：为了研究桥梁断面Strouhal数的雷诺数效应,通过调节试验风速来改变雷诺数,并在模型表面布置测压点,进行风洞试验。测量了不同雷诺数下各测点的风压时程,分析了压力梯度及压力系数功率谱及涡脱频率的随雷诺数变化规律,研究了Strouhal数的雷诺数效应。研究发现桥梁断面的压力梯度及压力系数功率谱具有明显的雷诺数效应,高雷诺数下,通过风压频谱寻找涡脱频率的方法不可行。研究表明,桥梁断面的Strouhal数具有较为明显的雷诺数效应。In order to study Reynolds number effect of Strouhal number of a bridge deck section,Reynolds number was changed by adjusting wind speed,and pressure taps were set on the surface of the model.Wind pressure time history was recorded with different Reynolds numbers.The varrying laws of pressure gradient,pressure coefficient power spectrum and frequency of vortex shedding were also studied with changes of Reynolds numbers.Reynolds number effect of Strouhal number was studied too.The investigation indicated that Reynolds number effect of the bridge deck pressure gradient and the pressure coefficient power spectrum is obvious,and it is difficult to identify vortex shedding by use of the frequency spectrum of pressure time-history record at high Reynolds number.Studies also showed that Reynolds number effect of Strouhal number exists in a bridge deck section.

关 键 词：桥梁工程 雷诺数效应 Strouhal数 风压系数 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]