抄録
Waki-machi Minami-machi in Tokushima prefecture is designated as the important preservation district of groups of traditional buildings, which is close to the Nankai trough and the Median Tectonic Line fault zone. Our structural investigation of traditional wooden houses there shows the seismic performance of several houses is not sufficient because of heavy weight and less of wall. Some houses have tilted pillars which are considered to have been caused by the residual deformation of former ground motions. Yield base shear coefficients correlate with natural frequency, and the houses with low yield base shear coefficient have low natural frequency.
