2006 Volume 13 Issue 52 Pages 57-64
This paper will introduce details of seismic retrofitting works done for gable roof framed gymnasiums of elementary schools and of junior high schools which were constructed from 1971 to 1981 in Maizuru city, Japan. Each of these gymnasiums is of gable roof frame with columns and beams made of H-sections. Structural safety inspections revealed that they have serious welding defects at their beam-to-column connections, which required structural reinforcement. The reinforcement was pressing because it was neces sary not only for seismic safety but also for the purpose of providing for heavy snowfall; and so all the steps of the reinforcing works were completed within an extremely short period.