The change of natural frequency according to seismically damaged reicforced concrete (RC) frames was evaluated by using shaking table test results of full-scale one-span RC frame. As the damages of cracks and yields of reinforcing bars were occurred, the frequency decreased. The frequency got decreased to about a half of the initial frequency when the RC frame specimen collapsed.

• 김경민(국립재난안전연구원 책임연구원, 공학박사) | Kim Kyung-min
• 이정한(국립재난안전연구원 시설연구사, 공학박사) | Lee Jung-han
• 김진선(국립재난안전연구원 선임연구원, 공학석사) | Kim Jinseon
• 박병철(국립재난안전연구원 시설연구관, 공학박사) | Park Byung-cheol
• 오상훈(부산대학교 건축공학과 교수, 공학박사) | Oh Sang-hoon