비선형유한요소해석을 통한 이방향 중공슬래브의 전단거동분석

Abstract

Recently, biaxial hollow slab system is widely used since it can reduce self-weight of RC slabs. In order to reduce self-weight of slabs, biaxial hollow slabs have void hollow spheres within the webs of the slabs which do not mainly contribute to the flexural behavior of the slabs in ultimate state. However, the partial absence of webs reduces the shear strength of the slabs. Therefore, it is necessary to reasonably understand the shear performance of the biaxial hollow slabs. In this study, the shear behavior of biaxial hollow slabs was analyzed using nonlinear FEM according to various design parameters such as concrete strength, reinforcement ratio, the diameter and spacing of void spheres, and shear span to depth ratio. The existing shear strength models were evaluated to investigate their applicability to the shear strength prediction of biaxial hollow slab system and the strain-based shear strength model was modified to estimate the shear strength of biaxial hollow slab system.