To analyze the influence of earthquake shaking and torsional components on dynamic responses of isolated structures,a 5-story model of an isolated steel frame structure was established.The finite element analysis results were compared with the measured data from a shaking table test to verify the accuracy of the modeling analysis.The translational components and translational-rotational coupling components of ground motions were inputted into the model to analyze the dynamic responses of the isolated structure.The results show that the dynamic responses of the isolated structure under ground motions with and without velocity pulses in translational and torsional coupling were higher than those of the isolated structure with only translational ground motion.The effects of rotational components of ground motion with velocity pulses on the dynamic responses of the isolated structure were higher than those without velocity pulses.The amplification of isolation layer displacement response for the base-isolated structure under torsional coupling was greater than that under swinging coupling.
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