Abstract
Results of testing reinforced self-compacted concrete slender columns having longitudinal holes concealing PVC pipe in their cross sections under axial compression load and uniaxial bending are presented in this paper. The effect of hollow shape on the performance of slender columns having 200x200mm quadratic cross section and 1300mm long under concentric and eccentric loads was investigated. Three different shapes of central hole: circular, square, and lozenge pattern in addition to the different load eccentricity values were considered to investigate the axial loading resistance and cracking load, lateral and longitudinal deflections of the columns. Test results have showed that altering the hollow shape inside the area of column cross section does not show a great influence on the column behavior unless the hollow ratio changed. The effect of hole shape or the hollow ratio on loading capacity is insignificant but the existence of a hole embedded longitudinally in the column significantly decreases its ultimate capacity. The effect of hollow shape or hollow ratio on a slender columns behavior subjected to eccentric loading with small ratio of load eccentricity to total column thickness (e/h=.33) was more than that of large eccentricity (e/h=1.0). Accordingly, the decrease in loading column capacity of columns was (5.0%, 2.5%, and 6.6%) compared to (3.2%, 2.2%, and 4.7%) for the same hole shapes respectively.
Highlights
Making internally a longitudinal hole into the column has two fundamental interests in structural building: a decrease in the building weight and the facility to hide PVC tubes reinforced concrete columns for rainwater drainage, see Figure 1
They found a significant decrease in loading capacity of the columns, and the obtained factor of safety differs from 1.2 to 1.59, which is less than the nominal value of 2 as mentioned by the American Concrete Institution (ACI) code requirements
Galano and Vignoli [7] presented a study on high strength concrete (HSC) and self-compacting concrete (SCC) slender columns
Summary
Making internally a longitudinal hole into the column has two fundamental interests in structural building: a decrease in the building weight and the facility to hide PVC tubes reinforced concrete columns for rainwater drainage, see Figure 1. Lignola et al [5] and Yazici and Hadi [6] performed experimentally an investigation on the square hollow reinforced concrete short columns surrounded by carbon fibers reinforced polymer (CFRP) They found that the failure modes of members were highly affected by the happening of early mechanism of axially loaded members buckling and the spalling of concrete cover, and the CFRP confinements could delay this mechanism, causing an increase in strength capability and ductility of such members, even in large eccentricity values. The present study is devoted to the behavior and load carrying capacity of reinforced self-compacted concrete slender columns having longitudinal hollow hiding PVC pipe in their cross sections under eccentric loads considering some important
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