【摘要】 介绍了杭州湾跨海大桥全桥气弹模型风洞试验中静风和抖振内力测量方法,探讨了斜拉桥静风内力的计算方法,采用考虑桥塔风效应的抖振时域分析方法计算出大跨斜拉桥的抖振内力,静风响应分析采用风洞实测平均风速剖面指数,抖振响应分析也采用风洞实测的紊流风速谱和空间相关性,并分别与风洞试验结果进行了对比.计算值与试验值吻合较好.分析比较结果表明,斜拉索的风荷载计算模式对静风内力影响较大,考虑桥塔风效应将会显著增加桥塔的横向抖振内力.更多还原

【Abstract】 Based on the full model test of the Hangzhou gulf bridge,a measuring method of internal forces induced by static wind and buffeting is derived.Calculation methods of responses of Cable-stayed bridge under static wind are studied and time-domain buffeting analysis with consideration of pylon wind field is used to calculate buffeting-induced structural internal force.The measured exponent of the mean wind profile is used in the analysis of static wind and the measured turbulence wind spectrums and spatial coherence are used in the analysis of buffeting.The numerical results are agreeable with the wind tunnel test results on the whole.Furthermore,the comparisons show that calculation models of cable influence static wind internal forces greatly and the effect of pylon wind field can increase the lateral buffeting response of pylon greatly.更多还原