Dynamic characteristics and seismic response of frame-core tube structures, considering soil-structure interactions

In order to study the dynamic characteristics and seismic response of high-rise buildings with a frame-core tube structure, while considering the effect of soil-structure interactions (SSIs), a series of shaking table tests were conducted on test models with two foundation types: fixed-base (FB), in which the superstructure was directly affixed to the shaking table, and SSI, consisting of a superstructure, pile foundation, and soil. To increase the applicability of the model to the dynamic characteristics of real-world tall buildings, the superstructure of test models was built at a scale of 1/50. This simulated a 41-floor high-rise building with a frame-core tube structure. The mode shape, natural frequency, damping ratio, acceleration and displacement response, story shear, and dynamic strain were determined in each of the test models under the excitation of simulated minor, moderate, and large earthquakes. The SSI effect on frame-core tubes was analyzed by comparing the results of the two test models. The results show that the dynamic characteristics and seismic response of the two systems were significantly different. Finally, these results were verified by performing a numerical analysis on the differences in the seismic responses of the FB and SSI numerical models under various simulated seismic conditions.