TORSIONAL STRENGTHENING OF PRESTRESSED SELF COMPACTING CONCRETE BOX BEAMS USING INTERNAL TRANSVERSE CONCRETE DIAPHRAGMS TECHNIQUE

Hameed Aziz, Ali; Habeeb Hashim, Oday

	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, 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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