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以风洞试验和数值分析相结合的研究手段,对江东大桥分体式扁平双箱梁悬索桥在2种气候模式下的颤抖振性能进行对比研究,认为江东大桥抗风安全性能良好。分体式扁平钢箱梁的颤抖振响应分析中,2种不同气候模式下导纳函数取Sears函数时均与实测结果吻合良好且略高于风洞试验结果,导纳函数取1过于保守。研究证明,分体式扁平双箱梁颤抖振计算中导纳函数取Sears函数具有较好精度,满足工程安全性要求。
Based on the wind tunnel test and numerical analysis, the quivering vibration performance of the split-type double box girder suspension bridge of Jiangdong Bridge in two climate models is compared and studied, and the wind-resistant safety performance of Jiangdong Bridge is good. In the analysis of the quivering vibration of the split flat steel box girder, the Sears function of admittance function in two different climate models agree well with the measured results and slightly higher than the wind tunnel test results. The admittance function is too conservative. The research proves that the Sears function of admittance function in split flat double box girder has good accuracy and meets the requirements of engineering safety.