中文摘要：

以苏通大桥为研究背景,通过专门研制的一套测压装置,利用测压法对苏通大桥主梁断面气动导纳进行了现场实测研究,并将现场实测结果与风洞实验结果及Sears函数进行了对比研究。结果表明：现场实测结果与风洞实验结果接近,与Sears函数有交叉,在低频范围内远小于Sears函数,在高频范围内逐渐与Sears函数靠拢,表明对于气动导纳来说,风洞实验结果是可靠的,且传统上利用Sears函数代替气动导纳函数进行桥梁结构抖振响应分析时得出的结果将过于保守,因此,对大跨桥梁进行抖振响应分析时,应针对气动导纳函数进行专门的实验研究。

英文摘要：

A set of pressure-measurement system was particularly made to actually test the aerodynamic admittance function of the deck of Su-tong Bridge＇s main girder.And the actually tested results were compared with those of wind tunnel test and Sears function.The results showed that the actually measured aerodynamic admittance function was less than Sears function in the low-frequency range,while gradually got closed to Sears function in the high-frequency range.The wind tunnel test results of aerodynamic admittance were reliable,and compared with the aerodynamic admittance function,the traditional Sears function was too conservative in bridge buffeting response calculation.So,the aerodynamic admittance function should be tested particularly in buffet response estimate of long span bridges.