4
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Seismic Assessment of RC Bridge Columns Retrofitted with Near-Surface Mounted Shape Memory Alloy Technique

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          From past earthquakes, it has been found that the large residual displacement of bridges after seismic events could be one of the major causes of instability and serviceability disruption of the bridge. The shape memory alloy bars have the ability to reduce permanent deformations of concrete structures. This paper represents a new approach for retrofitting and seismic rehabilitation of previously designed bridge columns. In this concept, the RC bridge column was divided into three zones. The first zone in the critical region of the column where the plastic hinge is possible to occur was retrofitted with near-surface mounted shape memory alloy technique and wrapped with FRP sheets. The second zone, being above the plastic hinge, was confined with Fiber-Reinforced Polymer (FRP) jacket only, and the rest of the column left without any retrofitting. For this purpose, five types of shape memory alloy bars were used. One rectangular and one circular RC bridge column was selected and retrofitted with this proposed technique. The retrofitted columns were numerically investigated under nonlinear static and lateral cyclic loading using 2D fiber element modeling in OpenSees software. The results were normalized and compared with the as-built column. The results indicated that the relative self-centering capacity of RC bridge piers retrofitted with this new approach was highly greater than that of the as-built column. In addition, enhancements in strength and ductility were observed.

          Related collections

          Most cited references53

          • Record: found
          • Abstract: not found
          • Article: not found

          Design-oriented stress–strain model for FRP-confined concrete

            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Ferrous polycrystalline shape-memory alloy showing huge superelasticity.

            Shape-memory alloys, such as Ni-Ti and Cu-Zn-Al, show a large reversible strain of more than several percent due to superelasticity. In particular, the Ni-Ti-based alloy, which exhibits some ductility and excellent superelastic strain, is the only superelastic material available for practical applications at present. We herein describe a ferrous polycrystalline, high-strength, shape-memory alloy exhibiting a superelastic strain of more than 13%, with a tensile strength above 1 gigapascal, which is almost twice the maximum superelastic strain obtained in the Ni-Ti alloys. Furthermore, this ferrous alloy has a very large damping capacity and exhibits a large reversible change in magnetization during loading and unloading. This ferrous shape-memory alloy has great potential as a high-damping and sensor material.
              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Flexural Members with Confined Concrete

                Bookmark

                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                05 April 2020
                April 2020
                : 13
                : 7
                : 1701
                Affiliations
                School of Civil Engineering, College of Engineering, University of Tehran, Tehran P.O. BOX 4563-11155, Iran; ammarabbass@ 123456ut.ac.ir (A.A.); m.ghassemieh@ 123456ut.ac.ir (M.G.)
                Author notes
                [* ]Correspondence: attarnjd@ 123456ut.ac.ir
                Author information
                https://orcid.org/0000-0003-3512-4866
                https://orcid.org/0000-0003-3566-538X
                Article
                materials-13-01701
                10.3390/ma13071701
                7178690
                32260511
                308499b2-e175-4b6f-b0c6-09b023d04be0
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 09 March 2020
                : 03 April 2020
                Categories
                Article

                shape memory alloys,near-surface mounted,retrofit rc bridge columns,self-centering

                Comments

                Comment on this article