TORSIONAL STRENGTHENING OF PRESTRESSED SELF COMPACTING CONCRETE BOX BEAMS USING INTERNAL TRANSVERSE CONCRETE DIAPHRAGMS TECHNIQUE | ||
| Journal of Engineering and Sustainable Development | ||
| Article 1, Volume 21, Issue 5, October 2017, Pages 129-143 | ||
| Authors | ||
| Ali Hameed Aziz; Oday Habeeb Hashim | ||
| Abstract | ||
| In the present paper, new technique by adding internal concrete diaphragms, in transverse direction, for prestressed self-compacting concrete box beams is adopted. Six SCC beam specimens have a dimension of (2200x220x350mm) for length; width and height, respectively were poured and tested. Three variables were adopted in present study; section type (Box or Solid), number of diaphragms (None, Two and Four), and type of diaphragms (Opened and Closed). Experimental results showed that the ultimate torque moment increases about (58.6%-72.4%) and (120.7%-127.6%) for beam specimens strengthened internally by two and four diaphragms, respectively. Also, increasing of internal diaphragms from two to four, led to increase the ultimate torque moment about (55.2%-62.1%). Furthermore, the change of section from box section with four internal diaphragms to solid section, led to increase in ultimate torque moment about (48.3%-55.2%). The paper conclude that the increasing in torsional capacity was attainable for box beams by using the technique of strengthening by internal diaphragms; Also, the box sections can be made with internal opened diaphragms and possess same capacity or contribution of the closed ones. | ||
| Keywords | ||
| torsion; Self; Compacting Concrete; Box Beam; Strengthening; Diaphragms; Prestress | ||
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