Experimental investigation of the structural behaviours of self-compacted reinforced concrete hollow beams with in-place circular openings

摘要

This paper aimed to experimentally investigate the structural conduct of self-compacted concrete hollow beams with various in-place openings. For this purpose, ten reinforced concrete hollow beams were tested under two concentrated and symmetrical loadings. The primary parameter in this study was the location of the openings, and specimens were divided into two groups in addition to the control beam: group one included six beams with openings in front or front and rear of the web, while the second group contained three beams with an opening in the bottom flange of the beam. The results showed that all reinforced concrete specimens suffered from higher deflection and stiffness reductions. The load-carrying capacity was decreased in ranges between 5.2% and 16 % for group one and 5.5 % to 9 % for group two compared to the control beam. A reduction was also observed in the ductility index values, ranging from 2.8 to 1.5 compared to the control beam.