Building Research Institute (BRI) of Japan is operating a nationwide strong motion network for building structures. The 2011 East Japan Earthquake has triggered 60 stations out of 79 stations of the BRI network. Most of the stations experienced the strongest shaking ever. Among buildings in the BRI network, at least four buildings suffered some damage due to the severe earthquake motions. Through the analyses of strong motion data recorded in those buildings, obvious change of the natural period
Building Research Institute (BRI) of Japan is operating a nationwide strong motion network for building structures. The 2011 East Japan Earthquake has triggered 60 stations out of 79 stations of the BRI network. Most of the stations experienced the strongest shaking ever. Among buildings in the BRI network, at least four buildings suffered some damage due to the severe earthquake motions. Through the analyses of strong motion data recorded in those buildings, obvious change of the natural period