Abstract
The current paper aims to investigate, experimentally, the torsion behavior of reinforced concrete box beams made by self-compacting concrete and strengthened internally by in-plane steel bracing of K-Shape. Four identical large size beams had a nominal cross-section dimension of (0.3x0.3m) with a total length of (2.1m) were constructed and loaded to failure under the effect of pure torsion. The experimental result shows that the failure torsion moment of strengthened beam specimens with K-shape steel bracings increases with a percentage up to (82%) more than un-strengthened beam and the angle of twist decreases by a percentage up to (35.5%). While, the axial elongation decreases by a percentage up to (53%). The presence of the internal in-plane K-shape steel bracing is effective and simple method in enhancing the ultimate carrying torsion capacity.
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