دانلود رایگان مقاله لاتین رفتار باند آلیاژ حافظه دار از سایت الزویر
عنوان فارسی مقاله:
رفتار باند آلیاژ حافظه دار (SMA) صاف و شن و ماسه پوشش داده شده در میلگرد در بتن
عنوان انگلیسی مقاله:
Bond behavior of smooth and sand-coated shape memory alloy (SMA) rebar in concrete
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Performance of reinforced concrete (RC) as a composite is signifi- cantly affected by the interaction of reinforcement and concrete which is referred as the bond strength. Bond strength–slip of rebar within concrete plays a critical role in the deformation of RC member [1]. Significant research has been conducted in this area to better understand the bond behavior of different types of rebars in concrete. Development length equations in the design of RC structures are established based on the bond strength. Different parameters affect the bond strength such as, bar geometries, concrete properties, presence of confinement around the bar, as well as surface conditions of the bar [2]. Over the past few years, researchers have experimented different applications of shape memory alloy (SMA) in civil infrastructure for improved performance of buildings and bridges during earthquakes [3–6]. However, little is known about the bond strength of SMA rebar with concrete. Since the surface condition and mechanical properties of SMA is completely different from regular steel rebar, it is imperative to investigate their bond properties before developing design equations and large scale industrial applications. Conventional steel reinforcement possesses lugs or surface deformations which transfer the bond forces by mechanical interlock and friction. However, SMA rebars are usually produced in round shape with smooth surface without any deformation or lugs. Moreover, most of the commercially available SMA rebars are made of Ni–Ti alloy which is extremely hard and difficult to machine using conventional equipment [7]. On the other hand, threading of large diameter SMA rebars reduces the strength significantly [7]. Although the surface of SMA rebar is similar to the plain steel reinforcement found in historical structures, mechanical behavior of SMA bars, however, significantly differs from that of the plain steel reinforcing bars. Extensive experimental studies have been carried out by several researchers on the bond behavior of plain steel reinforcement [1,8–10]. However, no study has been undertaken so far to evaluate the bond behavior of SMA rebars with concrete. This justifies the need to conduct an experimental investigation of the bond behavior of SMA rebars embedded in concrete. Several researchers have investigated and showed the efficacy of SMA as reinforcement in concrete structures [3–7]. However, for large scale application in construction industry, different structural aspects of SMA rebars should be investigated to ensure their reliable application. The interfacial bond behavior between SMA rebar and concrete is a governing factor in controlling the deformation of SMA–RC structures. Moreover, most of the applications of SMA rebar found in literature are focused on compression members such as columns and bridge piers. The compression bond behavior of reinforcement in concrete is signifi- cantly different for rebars in tension. Moreover, design codes suggest different development length equation for tension and compression development lengths. Very few studies [8,9] have reported the compression bond behavior of rebars embedded in concrete. This study is aimed at investigating the compressive bond behavior of SMA rebars embedded in concrete.
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کلمات کلیدی:
Bond–slip behavior of superelastic shape memory alloys for near ... iopscience.iop.org/article/10.1088/1361-665X/26/3/035020/meta by SM Daghash - 2017 Feb 7, 2017 - The use of superelastic shape memory alloy (SMA) bars in the .... Bond behavior of smooth and sand-coated shape memory alloy (SMA) rebar ... TiNi shape memory alloy coated with tungsten: a novel approach for ... link.springer.com/article/10.1007/s10856-014-5158-8 by H Li - 2014 - Cited by 7 - Related articles Jan 31, 2014 - This study explores the use of DC magnetron sputtering tungsten thin films for surface modification of TiNi shape memory alloy (SMA) targeting ... Iron-based shape memory alloys (Fe-SMA) - a new material for ... https://www.researchgate.net/.../281744248_Iron-based_shape_memory_alloys_Fe-S... May 10, 2016 - Download paper (PDF): Iron-based shape memory alloys (Fe-SMA) - a new material for prestressing ... coated with quartz sand using an epoxy adhesive. ..... smooth or ribbed FeSMA rebars, strips or wires are as follows:. Sma ppt - SlideShare https://www.slideshare.net/krishnapriyavv001/sma-ppt Sep 30, 2016 - Bond Behavior Of Smooth And Sand-coated Shape Memory Alloy (SMA) Rebar In Concrete The experimental program conducted in this ... A H M Muntasir Billah, PhD - Google Scholar Citations scholar.google.com/citations?user=83O7mYMAAAAJ&hl=en Parsons Inc. - alumni.ubc.ca Seismic fragility assessment of SMA-bar restrained multi-span continuous ... Bond behavior of smooth and sand-coated shape memory alloy (SMA) rebar in ... Shape Memory Alloys - Stanford University web.stanford.edu/~richlin1/sma/sma.html by R Lin - Cited by 4 - Related articles The main advantage of Nitinol is the smooth, controlled force it exerts upon activation. (Rogers, 156). Other miscellaneous applications of shape memory alloys ... [PDF]Evaluation of thermal spray coatings and shape Memory Alloys as ... pubs.geothermal-library.org/lib/grc/1030554.pdf by D King - Related articles This study focuses on using Thermal Spray and Shape. Memory Alloys (SMA) to possibly replace elastomers, and also serve as an additional backup seal to ...
