MOMENT REDISTRIBUTION IN CONTINUOUS MONOLITHIC AND SEGMENTAL CONCRETE BEAMS PRESTRESSED WITH EXTERNAL ARAMID TENDONS

摘要

An experimental investigation on the behavior of continuous segmental concrete beams, prestressed with external aramid tendons, was carried out. The main objective was to study the moment redistribution in the post-cracking stage. Two beams were tested; one was monolithic and the other was constructed in precast segments with no adhesive in the joints. Both beams had the same overall dimensions, with two 4.5 m spans and an I section 30 cm high, flange width of 30 cm and web thickness of 10 cm. The beams were post-tensioned with two external aramid tendons. Test results have shown that, in spite of the linear stress-strain relationship of the tendons, the moment redistribution also occurs in beams prestressed with these tendons, and that the moment redistribution in segmental beams can be higher than in monolithic ones.