Iron based shape memory alloys as shear reinforcement for bridge girders

نویسندگان

چکیده

Considerable age of a very high number bridges conjointly with steadily increasing amount traffic and changes in design philosophy (e.g. earthquake engineering) have made maintenance needed retrofitting become more important over the years. Retrofitting can necessary both for flexure or shear enhancements. Existing steel solutions strengthening are laborious complex, durability construction is questionable. As an alternative to solutions, carbon fiber reinforced polymer (CFRP) sheets strips used concrete beams. But, prestressing CFRP hardly applicable. However, has advantages that width existing cracks be reduced stresses internal stirrups reduced. Therefore, this study, new iron-based shape memory alloy (‘memory-steel’) form U-shaped (stirrups) ribbed bars nominal diameter 12 mm were combination sprayed mortar (RC) structures. The memory-steel activated electric resistive heating. activation resulted prestress about 300 N/mm2 reinforcement consequently vertical compressive web RC Large-scale experiments on T-beams height 0.75 m total length 5.2 performed show practicability efficiency strengthening. Promising results shown system works well practice. capacity could increased significantly. Furthermore, at serviceability limit state, prestressed overall beam deflections, stirrups, cracks, crack widths.

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ژورنال

عنوان ژورنال: Construction and Building Materials

سال: 2021

ISSN: ['1879-0526', '0950-0618']

DOI: https://doi.org/10.1016/j.conbuildmat.2020.121793