Early Cover Spalling in High-Strength Concrete Columns

摘要

The American Concrete Institute (ACI) 318-02 provisions for stress block parameters were derived using normal-strength concrete column tests. Azizinamini et al. in 1994, Ibrahim and MacGregor in 1996, Bayrak in 1999 have reported that the use of current ACI stress block parameters results in estimations that are not conservative for high-strength concrete column sections. This was mainly attributed to the early cover spalling in high-strength concrete columns. In this paper, a numerical procedure for simulating premature cover spalling in high-strength concrete columns (66 MPa