Estimating Ineffective Part of Critical Section for Punching Shear Strength of Flat Slabs with Openings

개구부가 있는 무량판 슬래브의 뚫림전단에 대한 위험단면 결손 산정

According to current design provisions for shear strength of reinforced concrete slabs, critical slab sections around columns should be modified in the presence of openings in slabs to consider the effect of openings on the shear strength of slabs. Although the method of estimating the ineffective part of critical section due to openings are explained in codes, the real math for calculating it is somewhat complex and cumbersome. This paper classifies different cases of the location and geometry of columns and openings, respectively, and derives corresponding equations for estimating ineffective part of critical section for each case.