Simplified Effective Compressive Strengths of Columns with Intervening Floor Slabs

• Published in: International journal of concrete structures and materials Vol. 14; no. 5; pp. 661 - 671
• Main Authors: Choi, Seung-Ho, Hwang, Jin-Ha, Han, Sun-Jin, Cho, Hae-Chang, Kim, Jae Hyun, Kim, Kang Su
• Format: Journal Article
• Language: English
• Published: Singapore 한국콘크리트학회 01-12-2020; Springer Singapore; Springer Nature B.V; SpringerOpen
• Subjects: Axial loads; Building Materials; column; Columns (structural); Compressive strength; Concrete slabs; Confinement; Copper; effective compressive strength; Engineering; high strength concrete; Load transfer; normal strength concrete; reinforced concrete; slab; Solid Mechanics; Structural Materials; 토목공학; effective compressive strength; column; high strength concrete; normal strength concrete; reinforced concrete; slab
• ISSN: 1976-0485; 2234-1315
• DOI: 10.1186/s40069-020-00419-8

The current design codes discuss the effective compressive strengths of columns, which reflect a decrease in load transfer performance that can occur when columns and slabs have different concrete compressive strengths. The effective compressive strength of a column increases as it is confined by the slab, and the design codes mandate three different effective compressive strengths for interior columns (confinement on four sides), exterior columns (confinement on three sides), and corner columns (confinement on two sides). For both corner and exterior columns, the confinement effect of the slab is significantly smaller than that for the interior column, and there is a more marked decrease in load transfer performance. However, there is still a lack of theoretical studies investigating the effective compressive strengths of the corner and exterior columns. Therefore, based on the analysis model established in previous research, this study has proposed an equation for calculating the effective compressive strengths of the corner, exterior and isolated columns without any confinement effects of the slab. In addition, axial loading tests of isolated columns were conducted and the proposed equation was verified.