Dear all,
I have a question related to the Strain Penetration effect in reinforced concrete, also known as bond slip. I already know the fact that the assumption of perfect bonding in real structure does not always occur and in many cases the rebar experience an amount of slippage under not a perfect bond condition. However, I have a question regarding this matter and that is:
Is there any deformation occurring to the rebar embedded in concrete even when the bonding is perfect? In other words, does the rebar elongates/extends due to its internal force, fs, even though it is under perfect bonding condition?
The reason I asked this question is that it seems to me that the total slip of the rebar is due to two terms: first relates only to the extension/elongation/deformation of rebar which can be calculated as the integration of strain diagram along the embedment length, and second is related to the local slip of rebar due to shear stress acting on rebar interface, which can be calculated by integrating the local slip at each point of the rebar along its length using the local bond-slip curve. The picture attached shows what I just described in this paragraph.
I do really appreciate your contribution to this discussion in advance.
Thanks Dr. Lei Li for your response. Yes, I understand that under perfect bonding the free-end slip is zero (because concrete and rebar work together), but my question concerns the load-end slip. I need to if the slip at the load-end is zero or not?
Hello Ahmad Soraghi ,
Perfectly bonded implies that there is no relative slip between concrete and the rebar. You consider that the rebar is embedded in the concrete. If you consider slip, it is not perfectly bonded.
Thanks Damien Decret for your response. Yes I undertand that the relative slip between concrete and rebar is zero, but it seems to me that there is another slip occuring which is NOT in the rebar-concrete interface, but at the loaded end, and that is due only to rebar stress and strain!
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