Experimental Study on the Mechanical Property of SMA Externally Prestressed Concrete Box Beam

摘要

This paper conducted an experiment to research flexural property of SMA unbounded prestressed box beam, which applied the Shape Memory Alloy(SMA) at martensite state as externally prestressing tendons, and then through heating the SMA bars fully anchored on the beam with cracks by electrifying motivation, drove SMA to produce the "recovery stress" because of transformation, to study the effects of this stress on the deflection and crack width of concrete box-beam on work, to study the recovery ability of SMA bars, and to provide basis for the application of the SMA bars to bridge strengthening.