An Experimental Study on High-Strength Concrete Column Strength Subjected to Eccentric Loads
Jae-Hoon Lee, Hae-Geun Park and Young-Shik Park
Appears on pages(s):
Columns (supports); failure; high-strength concretes; strains
High strength concrete has an advantage of strength capacity and stiffness especially for column elements. This paper is a part of a research plan aimed at verification of basic design rules to high-strength concrete columns. A total 24 column specimens were tested to investigate structural behavior and strength of eccentrically loaded reinforced concrete tied columns. The main variables included in this test program were concrete compressive strength, steel amount, eccentricity, and slenderness ratio. The concrete compressive strength varied from 34.9 Mpa to 70.4 Mpa and the column steel ratios were between 1.1 % and 5.5 %. The eccentricity was selected for the different failure modes, i.e., compression control, balanced point, and tension control. The slenderness ratio varied from 19 to 6 1. The column specimens with same slenderness ratio but with different concrete compressive strength were constructed and tested. Experimentally obtained column strength were compared with the analytical results by use of an equivalent rectangular stress block, a trapezoidal stress block, and a modified rectangular stress block. And also, the failure mode and concrete ultimate compressive strain were observed and discussed in this paper.