This study focused on the applicability of the fundamental period formula on historic buildings with masonry shear walls based on the building code in Taiwan. In order to verify the empirical formula proposed in the building code, ambient vibration measurements were conducted on 28 historic buildings with masonry shear walls to yield their fundamental periods, and then compared those measured periods with periods estimated by the original formula. Two disadvantages were shown in the original formula, poor correlation between estimated and measured periods and unconservative estimation of the earthquake force. To overcome these disadvantages, a new formula was estimated by only taking into account the shear behavior of masonry walls. In order to assure the feasibility of this modified formula, the evaluation on the origin formula in the building code by considering the normalized response spectrum coefficient was carried out. The results show that the modified formula not only shows conservative performance in the short-period region of these historic buildings but also have good correlation between measured and estimated periods.
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