VIBRATION CHARACTERISTICS OF HIGH-RISE STEEL BUILDING IN SHINJUKU SKYSCRAPER DISTRICT BEFORE AND AFTER THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE
4) In the main shock as well, the damping coefficients for the 1st and 2nd modes are found to be smaller than 0.02 which is a conventional assumption in design of steel buildings except for the one for the second mode in the EW direction.