Title:
An Effective Moment of Inertia of RC and Reinforced SFRC One-Way Slabs
Author(s):
Jung Lee, Kyungchan Kim, Chadon Lee, Songhee Lee
Publication:
Structural Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
deflection; design code; effective moment of inertia; fiber-reinforced concrete; serviceability; slab
DOI:
10.14359/51740850
Date:
6/3/2024
Abstract:
An effective moment of inertia (Ie) unified for reinforced concrete (RC) and reinforced steel fibrous concrete (RSFC) one-way slabs was presented. Two model parameters for the degree of tension-stiffening and plasticization of concrete in compression (PZC), where the relationships of concrete stresses and strains deviate from its linear elastic stage, were calibrated using 26 test results of RC and RSFC slabs, including 8 slabs tested in this study for three different reinforcement ratios (ρ) and fiber contents (Wf). Comparisons with test results revealed that underestimated deflections were predicted with the Ies currently adopted as basic formats in different codes, for RC slabs having relatively lower or higher ρ values and RSFC slabs with wide ranges of ρ typical to one-way slabs. However, regardless of the magnitudes of ρ and Wf, reasonable deflections were predicted with the unified Ie, which was constituted with linearized weight functions of the ratio of cracking moment to moment in service and modified to include the effects of ρ, PZC, and Wf.