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In this paper, we introduce an alternative index into the seismic retrofit to simply evaluate the seismic retrofit performance of existing wooden-framed houses. This index corresponds to the amount of the strengthening which is equivalent to reducing the weight, adding the viscous damping or adding the stiffness after the yielding. First, we present the formulations of the index and their parameter for three earthquake response spectra prescribed in the Building Standard Law. Next, a technique is discussed on the application of the formulations. Furthermore, we propose a seismic retrofit element with restoring force characteristics of hardening type to realize the retrofit by adding the stiffness after the yielding. The results obtained are summarized as follows: When the horizontal load-carrying capacity and the fundamental response are known, the seismic retrofit performance by any retrofit or the combination among the ones can be easily evaluated by using the index. The hardening type element is effective for seismic retrofit.

STUDY ON SIMPLE EVALUATION METHOD FOR SEISMIC RETROFIT PERFORMANCE OF EXISTING WOODEN HOUSES