To study the soil-structure dynamic interaction, field-simulated ground motion tests of a 15-storey reinforced concrete frame structure are designed and performed. The response records of the structure and ground motion near the foundation are processed and analyzed. The fixed-base natural frequencies and modal damping ratios of the superstructure are determined and compared with the results obtained by the pulsating test. At the fundamental system frequency, the relative roof displacement is almost caused by the rigid-body motion of the foundation. The foundation impedance functions can also be derived from the response data. The test results show an improvement in the accuracy of the amplitude-frequency and phase-frequency characteristic curves and effective reduction in the measurement errors of the phase difference.

为了研究土-结构动力相互作用，设计并进行了15层钢筋混凝土框架结构的现场模拟地震动测试。处理并分析了基础附近结构和地震动的响应记录。确定了上部结构的固定基准固有频率和模态阻尼比，并将其与脉动试验的结果进行了比较。在基本系统频率下，相对屋顶位移几乎由基础的刚体运动引起。基础阻抗函数也可以从响应数据中得出。测试结果表明，幅频特性曲线和相频特性曲线的准确性得到了改善，并且相位差的测量误差得到了有效降低。