Flexural Performance of Slender High Strength Steel Fiber Reinforced Concrete Colums Under Axial and Lateral Loadings

Abstract eng:
This paper describes an experimental study conducted on slender columns made of Steel Fiber Reinforced Concrete (SFRC). By using high strength concrete and high strength steel bars, the cross section of these slender SFRC columns is reduced to 1/4 that of columns made of ordinary concrete. The slender ratio (height to diameter ratio) of these columns is about 10 or higher. The SFRC contains 0.6% volume fraction of high strength steel fibers. The compressive strength of SFRC ranges from 172 to 234 N/mm2 and tensile strength of steel bars ranges from 295 to 980 N/mm2. Lateral loading tests are carried out to investigate the flexural performance of these columns. The experimental parameters are the compressive strength, size of column section, number and strength of steel bars, and contents of steel fibers. The test results show that using steel fiber decreases the damage of cover concrete of the columns and increases their flexural strength. In addition, the results show that slender SFRC columns possess high drift capacity. Several standards are used to evaluate the strength of the tested slender columns. The stress block factors relative to high strength concrete given in the New Zealand standard allow a good strength estimation of these columns. The impact of several parameters on the flexural strength evaluation is also presented.

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