Seismic response and damage limit of concrete filled steel tube frame

摘要

Seismic response and damage of Concrete Filled steel Tube frame (CFT frame) under strongrnground motion are calculated. The damage ratios of cracking and local buckling of CFT column and H-sectionrnbeam, which are closely related to the collapse of CFT frame, are obtained in relation with the column-overdesignrnfactor and the strength ratio of CFT column. On the basis of the calculated results, the damage limits ofrnCFT frame are investigated to prevent the local buckling and steel tube cracking of CFT column in relation withrnthe ultimate state design conditions which are the column-over-design factor of CFT frame, the strength ratio ofrnCFT column and the maximum velocity of input ground motion.