Experimental study on concrete beams reinforced with pseudoelastic Ni-Ti continuous rectangular spiral reinforcement failing in shear. (15th November 2016)

• Record Type: Journal Article
• Authors: Mas, Benito; Cladera, Antoni; Ribas, Carlos
• Is Part Of: Engineering structures. Volume 127(2016:Nov. 15)
• Page Start: 759
• Page End: 768
• Publication Date: 2016-11-15
• Subjects: Ni-Ti -- Pseudoelasticity -- Shear strength -- Reinforced concrete -- Seismic design; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2016.09.022
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Ni-Ti continuous rectangular spiral used as shear reinforcement. Experimental results of 7 small-scale tested beams failing in shear are presented. Beams reinforced with Ni-Ti spirals showed high deflections and large crack widths. Change of failure mechanism for beams reinforced with Ni-Ti spirals. The idea presented in the paper could be used for critical beam-column connections. Abstract: Shear failures in reinforced concrete beams are associated with brittle collapses, practically without reaction capacity by users, which may be associated with human and material losses. This behavior is related to low deformations at failure, which makes predicting failure difficult. Ni-Ti is the most commonly used shape memory alloy and is an exceptional material that has the ability to achieve high deformations and to return to a predefined shape after unloading or upon heating. An experimental campaign focused on assessing the possibility of obtaining more ductile shear failures using a Ni-Ti alloy reinforcement that shows pseudoelasticity at ambient temperature is presented. Seven small-scale reinforced concrete beams were tested to assess the feasibility of this idea. It is shown that the Ni-Ti spiral reinforcement makes it possible to obtain highly deformable concrete elements even for beams failing in shear.