β Scribed by Matthew Haskett; Deric John Oehlers; M.S. Mohamed Ali
No coin nor oath required. For personal study only.
The development of an accurate local bond stress-slip (Ο -Ξ΄) relationship for steel reinforcing bars has been hindered for two reasons: because steel reinforcing bars are internally encased, it is difficult to strain gauge the reinforcing bar to quantify the change in strain over a given length and, therefore, to directly measure the local Ο -Ξ΄ relationship; and because of the presence of yielding, which generally occurs before debonding and significantly influences the behaviour of the reinforcing bar. To overcome these difficulties associated with quantifying the local Ο -Ξ΄ relationship of steel reinforcing bars, theory developed to obtain the local Ο -Ξ΄ relationship from the global load slip (P-β) response of FRP plated reinforced concrete structures has been modified in this research to account for short embedment lengths. Furthermore, in this paper, a link between the global load-slip (P-β) response and the local Ο -Ξ΄ relationship of steel reinforcing bars, that is independent of embedment length, is presented for the first time. Additionally, the new theory is used to derive the local Ο -Ξ΄ relationship from test results and to illustrate the effect of corrosion on the local Ο -Ξ΄ relationship which quantifies the amount of corrosion to cause bar debonding in RC beams.
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