中文摘要：

对我国高速铁路不同梁型32 m简支梁桥实测的竖向刚度、自振特性及动车组作用下动力响应进行了分析,并对动车组作用于桥梁结构的机理进行了探讨。研究结果表明：梁体挠跨比实测值远小于设计值和规范限值,自振频率实测值大于设计值和规范限值,具有较大的安全裕量和优化空间;梁体竖向动力响应存在第3阶超谐共振现象,横向动力响应存在墩梁一体耦合振动峰值。《高速铁路桥梁运营性能检定规定（试行）》（TG/GW 209—2014）中给出的静态和动态参数通常值更接近桥梁结构实际状况,能更好地用于评价桥梁结构的运营状态。

英文摘要：

The vertical stiffness,natural frequency and dynamic response of different types of 32 m-span simplysupported box-girder on high speed railway were tested and analyzed.The mechanism of the motor train unit acted on bridge structure was discussed.The results show that the measured value of the vertical stiffness is far less than the design value and the code value,the measured value of the natural frequency is far greater than the design value and the code value,which has a larger safety allowance and optimization space.The peaking effects of the vertical dynamical response would appear when the speed is closed to the third of super-harmonic resonance speed.And the peaking effects of the lateral dynamical response would appear when the forced frequency is closed to the pier-beam lateral frequency.The static and dynamic parameter ordinary values of Verification Standard for High Speed Railway Bridge Operation Performance（Trial）（TG/GW 209—2014） are more closer to actual situation,and it can be better used for evaluating operating condition.