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진동대 실험을 통한 브레이스 적용 천장시스템의 내진성능평가
이재섭(Lee, Jae-Sub),정담이(Jung, Dam-I),조봉호(Cho, Bong-Ho) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.2
Most of the suspended ceiling systems have not been seismic designed in Korea, but the seismic criteria have been revised and the seismic design of the ceiling system is required. In this study, developed seismic design method of the rigid brace system for the in-direct suspended T-bar ceiling system with steel panels used in Korea and evaluated the seismic performance through the shake table test. The shaking-table tests were performed in accordance with the AC-156 standard with floor acceleration being applied horizontally in two directions using a 4.0m × 4.0 m steel frame. A anti-falling clip designed to prevent the panel from falling was applied to specimen. As a result of the test, in the case of the ceiling to which the rigid brace is applied, it was analyzed that the increase in the relative displacement between the members in the ceiling surface was more fatal to panel detachment than the impact load applied to the end.
진동대 실험을 통한 브레이스 보강 금속마감 천장의 내진성능평가
이재섭(Lee, Jae-Sub),정담이(Jung, Dam-I),이두용(Lee, Doo-Yong),조봉호(Cho, Bong-Ho) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.1
After the 2016 Kyoung-Ju and 2017 Po-Hang earthquakes, securing seismic performance of non-structural elements as well as structural elements of buildings has become an important design issue in Korea. Suspended ceilings can cause damage to life and property to residents due to the falling of finishing materials or collapse of ceiling frame members during earthquakes, and in particular, it can cause secondary damage by blocking the evacuation route. According to KDS 41 17 00, if the ceiling area of the Seismic design category D building exceeds 250 m², a seismic bracing system must be applied. This paper proposes a rigid bracing system to secure the seismic performance of the steel panel T-bar ceiling system, and evaluates the performance through the shake table test. Through experiments on two ceiling systems with different bracing arrangements, dynamic behaviors such as natural frequencies and relative displacements were analyzed, and the cause of panel separation during earthquakes was found. It was found that the relative displacement between the grid members was the biggest cause of panel detachment of the rigid braced ceiling system. In order to reduce the relative in-plane displacement of the ceiling, a method of narrowing the spacing between the braces or increasing the in-plane rigidity may be used.