The purpose of the paper is to evaluate the serviceability of two-way hollow core slab with the
distinguishingly donut shaped hollow named as GB-SLABTM(Green Ball based lightweight biaxial concrete SLAB) developed by Samsung and patented internationally. One of engineering issues in the long-span concrete slab structure is definitely how to evaluate the long-term deflection considering the cracked section. To evaluate the long-term deflection of GB-SLAB, the immediate deflection after concrete form removal is measured and then the long-term cracked deflection is predicted using finite element analysis

• 최원석(삼성물산 기술연구센터 Building R&D 파트, 주임연구원) | Choi, Won Seok Corresponding Author
• 이승창(삼성물산 기술연구센터 Building R&D 파트, 수석연구원) | Lee, Seung Chang
• 홍종국(삼성물산 기술연구센터 Building R&D 파트, 선임연구원) | Hong, Jong Kook
• 이후선(삼성물산 용강2재개발아파트, 현장소장) | Lee, Hoo seon
• 김정주(삼성물산 용강2재개발아파트, 공사팀장) | Kim, Jung Joo