Ground microtremor test in shaking table experimental investigation on the steel corrugated utility tunnel

Shaking table test is an important method to study the seismic performance of structures. The accuracy of the test model which is designed based on the similarity ratio theory has a crucial impact on the reliability of the shaking table test results. In this paper, a steel corrugated utility tunnel model was made. Before it was fixed to the shaking table, the natural frequency of the model structure was measured by ground microtremor test, and the natural frequency of the prototype structure was obtained by numerical simulation. The ratio between test value and simulate value was calculated and compared with a pre-set similarity ratio to verify the accuracy of the model. The results demonstrate that the natural frequency of the model structure could be effectively obtained by ground microtremor test. The method of comparing frequency can comprehensively evaluate whether there gets some problem in designing and manufacturing the model structure. This paper can provide some references for the preliminary model design and preparation of the shaking table tests.