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Study of Behaviour of Short Concrete Columns Confined with PVC Tube under Uniaxial Load

An experimental investigation has been carried out to evaluate the effectiveness of Polyvinyl chloride (PVC) confinements in short plain circular concrete columns. The experimental part is conducted using different tube diameters (110, 160, 220, and 250 mm) with two types of confinement strategies (fully and confined with the cut ends). The results are validated with unconfined samples (control samples). The test results showed that using external confinement of concrete columns by PVC tubes enhances the ultimate load capacity of the short columns. For fully confined samples, the enhancement ratio ranges between 5% and 8.3%, and from 4.16% to 15% for samples with cut ends. Furthermore, the confining of PVC pipes with the cut ends has a more considerable effect on load capacity for all diameters except the ones with 250 mm, where the samples with full confinement ( carried a bigger load than those with cutting ends. Finally, a numerical simulation of samples is carried out by the finite element model using the software. For all scenarios, the results of the numerical analysis showed considerable similarity to the experimental results, with of 0.95 indicating the high linearity between the actual and simulated compressive strength values. Moreover, the induces fewer simulated errors with a relative error ranging from 0.16% to 6% for all scenarios.