Stress-Strain Behavior for Actively Confined Concrete Using Shape Memory Alloy Wires

Within this work a new and innovative method using shape memory allow (SMA) wires to actively confine concrete members is discussed and further researched in great detail. This new confinement method utilizes a constant confining pressure that is a direct result to the SMA material being able to recover large inelastic strains with the application of heat. Due to the extraordinary behavior that these SMAs display, this confining method is classified as “active confinement”, which has been proven to be superior in almost every way to the ordinary passive confinement method that is almost exclusively used throughout the world. In an attempt to fully understand this confinement method, great detail was spent on accurately formulating the stress-strain relationship of confined concrete members under certain varied parameters. To achieve this goal Mander et al. (1988)’s passive unified stress strain model was modified for application with SMA wires, and multiple equations were incorporated within the model for comparison purposes to analytically correlate the stress-strain relationship of the actively confined concrete.Once multiple analytical formulations are shown and discussed, a medium scale experiment was undertaken, where the compressive stress-strain relationship of 15 SMA confined concrete cylinders was obtained. With this experimental data, the confining effectiveness of the model was verified and the most accurate formulation was concluded to be from equations by the Xiao et al. (2010).This research highlights that SMAs have an endless amount of possible applications, and due to the drastic reduction in price that has occurred in the past and which is expected to continue to occur in the future, structural engineers need to be aware of these alloys and continue to find innovative methods that utilizes their extraordinary behavior. With this in mind, the confining method described within this work could do just that and eventually become the predominant structural confining method in the not so distant future, due to the superior stress-strain relationship shown.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Civil Engineering

Grantor dc:publisher

The Ohio State University

Year dc:date

2013

Author dc:creator

• Zuboski, Gordon R.

Contributors dc:contributor

• Chaturvedi, Shive

• Civil Engineering
• Structural Confinement of Concrete
• Active Confinement
• Shape Memory Alloys
• SMAs
• Concrete Confinement
• Stress versus Strain of Confined Concrete
• Increase in Ductility

Statement dc:rights

• unrestricted
• This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.

Language dc:language

English

Repository record dc:identifier

http://rave.ohiolink.edu/etdc/view?acc_num=osu1366283158

OAI identifier oai:identifier

oai:etd.ohiolink.edu:osu1366283158