The main objective in this paper is to focus on investigations on the limits of the HWR for isolated building with the rubber bearings under different conditions subjected to earthquake excitations. The simplified formulation is derived and some influenced factors are studied and discussed. According to the numerical results, it has been found that the effects of site soil conditions and vertical seismic motion in the soft site on the HWR limit values are important and the period of isolated building also plays a considerable role in the HWR limit value, namely, the isolated building with a larger period may have a relatively large HWR value. Furthermore, an effective method to improve the HWR limit value is proposed.
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