Abstract
In this research the behavior of reinforced concrete slender columns with longitudinal hole under axial compression load and uniaxial bending is investigated. The paper includes testing of ten slender columns with dimensions (150 150 1300 mm). The investigation deals with the effect of using different diameters of column hole on the values of the load carrying capacity and cracking loads, mid-height lateral deflection and longitudinal shortening of the columns. Five diameters for the column holes were considered (0, 25.4, 38.1, 50.8, and 76.2)mm. Test results have showed that when the holes were located at the center of the column cross-section and the column was loaded with high load eccentricity, the effect of hollowing ratio on load capacity is insignificant. For hollowing ratios used in this study (0%, 2.3% ,5.1%, 9% and 20.3%), the ultimate load is decreased by (0%, 0.28%, 1.03%, 3.28% and 6.48%) respectively. The effect of hollowing ratio on columns loaded with small eccentricity of 50mm (e/h=.33) is greater than the effect of hollow ratio of columns with 150 mm eccentricity(e/h=1.0) which reduces the load capacity for the columns by (0.00%, 0.66%, 2.65%, 4.97% and 11.26%) for hollowing ratios (0%, 2.3%, 5.1%, 9% and 20.3%) respectively.
Highlights
To maximize structural efficiency in terms of strength/mass and stiffness/mass ratios and to reduce contribution of the column to seismic response and high carrying demand on foundation, it is desirable to use hollow cross section for columns
Transverse openings and longitudinal holes are often provided in reinforced concrete columns to allow access for services such as pipes for plumbing and electric wiring
Few research studies exists regarding long columns and hollow columns especially when the columns are subjected to combined axial compression load and uniaxial bending moment
Summary
To maximize structural efficiency in terms of strength/mass and stiffness/mass ratios and to reduce contribution of the column to seismic response and high carrying demand on foundation, it is desirable to use hollow cross section for columns. Lignola et al [3], carried out experimental tests on seven square hollow reinforced concrete short columns confined with CFRP. Yazici and Hadi [5], carried out a series of tests on the CFRP wrapped hollow core reinforced concrete circular short columns. Campione et al [6], studied the behavior of fiber-reinforced concrete short columns subjected to concentrically compressive load. An experimental study investigating sixteen short, confined, reinforced concrete column with and without steel fibers was conducted. The present work is devoted to study experimentally the reinforced concrete slender columns with longitudinal holes under eccentric loads. This study is devoted to investigate the behavior and load carrying capacity of slender and short columns having circular hole along column length.
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