【摘要】 针对桥塔在风载荷下的涡激共振可靠性问题,在涡激振动机理与频率锁定现象研究基础上,提出一种计算桥塔涡激振动可靠性的简化方法。将临界风速结合Re数和Strouhal数建立涡激共振下桥塔安全裕度方程,并引入AFOSM求解方法解决非线性问题,利用MATLAB进行可靠性求解程序编制,在保证计算精度的同时大大降低了桥塔涡激振动可靠性的计算难度,节省计算时间。最后以天津海河吉兆桥为例,说明提出的简化方法是可行和可靠的。更多还原

【Abstract】 To evaluate the reliability of bridge tower vortex excited vibration induced by wind,a simplified calculation method is proposed on the basis of the research on vortex induced vibration mechanism and the phenomenon of frequency locking.The safety margin equation is derived by critical wind speed with Re number and Strouhal number.A non-linear solving program for reliability analysis based on AFOSM theory and MATLAB is programmed.By using the reduction method of this paper,with satisfactory calculation accuracy,the calculation difficulty of reliability analysis for bridge tower vortex excited vibration is overcome.Its calculation time is saving.This calculation method has been used in the Haihe Jizhao Bridge project.The results show that this simple calculation method is reliable.更多还原