中文摘要：

通过动载试验可以准确了解加固之后桥梁结构的工作状态。本文以甘肃S202线一座桥的动载试验为例,测试了该桥梁的一阶竖向自振频率、动挠度等参数,计算分析了结构的阻尼比、动力冲击系数。结果表明：结构一阶竖向自振频率的理论值与实测值相符合,且自振频率较大,结构在竖向具有较大的刚度;跑车工况下车速与动挠度成反比,跳车工况下恰好相反;结构的动力冲击系数较为集中稳定,结果满足规范要求。

英文摘要：

Trough the dynamic load test, the w orking state of the bridge after the reinforcement can be accuratelyunderstood. Taking the dynamic load test of Gansu S202 bridge as research object, the parameters of the first ordernatural frequency and dynamic def lection of the bridge were tested to calculate and analysis the damping ratio anddynamic impact coeff icient of the structure. The results show that the theoretical value of the f irst order naturalfrequency of the structure is in line with the measured value, and the natural frequency is larger . The structure has alarger stiffness in the vertical direction. Under the condition of the sports car,the vehicle speed is inverselyproportional to the dynamic def lection, while it is opposite under the condition of the jump car . The dynamic impactcoeff icient of the structure is more stable, which can meet the requirements of the specif ication.