도넛형 이방향 중공슬래브의 부착강도 산정방법에 관한 고찰

Abstract

This paper presents an experimental investigation of bond strength of donut type biaxial hollow slab. For this slab, Inner coverthickness is formed between hollow sphere and rebar according to hollow sphere. Therefore, bond conditions were changed bychanging inner cover thickness along the axial rebar. So, the existing calculation method for bond strength by CEB-FIP etccan’t be applied on the donut type biaxial hollow slab. Therefore, this paper find out the effect of inner concrete coverthickness on the bond strength. To do this, pull-out tests were performed. The main parameters were inner cover thicknessand bond length. Estimation method of bond strength for this slab was proposed, and validity of this method was verified.