Bond stress in plain reinforcing
Bond stress in plain reinforcing
(OP)
I am confronted with evaluating the strength of some base plate anchor bolts (undeformed, but with a standard hook) and embedded 5.5 ft into 3000 psi concrete. Current ACI codes do not permit using plain reinforcing bars and therefore do not specify any allowable bond stress or development lengths for them.
I found in ACI 318-63 (yes, that's 1963, Sect 1801) provisions for evaluating stress on plain bars, but it results in an allowable tension woefully inadequate.
Does anyone have any more recent or accurate data on this??? Any help would be appreciated.
I found in ACI 318-63 (yes, that's 1963, Sect 1801) provisions for evaluating stress on plain bars, but it results in an allowable tension woefully inadequate.
Does anyone have any more recent or accurate data on this??? Any help would be appreciated.






RE: Bond stress in plain reinforcing
www.PeirceEngineering.com
RE: Bond stress in plain reinforcing
RE: Bond stress in plain reinforcing
In this and above statement, check against / consider factored loads.
RE: Bond stress in plain reinforcing
RE: Bond stress in plain reinforcing
fy>=2200 kgf/cm2
3400 kgf/cm2 <= fu <= 5000 kgf/cm2
You can take the fy=215 MPa as per EH-91 above of the same characteristics
RE: Bond stress in plain reinforcing
Straight,
RE: Bond stress in plain reinforcing
RE: Bond stress in plain reinforcing
RE: Bond stress in plain reinforcing
Structural steel design: a practice-oriented approach
Abi Aghayere, Jason Vigil
Pearson Education, Inc., NJ
that by the way seems an excellent steel book.
I have found that the EC remits to National Annexes for the bond stress design for plain bars; as soon I find some relevant quote I may add to this body of references.
RE: Bond stress in plain reinforcing
In french...
"Le présent NCCI suppose que la valeur de calcul pour une barre lisse est la valeur donnée au §8.4 de l'EN 1992-1-1 (c'est-à-dire la valeur de calcul pour une barre non lisse du même diamètre, de béton similaire et dans des conditions similaires) divisée par 2,25. Il se peut que l'Annexe Nationale pertinente donne des conseils sur la conception pour l'adhérence d'ancrage de barres lisses."
See Annex A of(attached) Access Steel document giving bond strength of plain rebar as per Eurocode 3.
RE: Bond stress in plain reinforcing
Much obliged.
http://www.spiraleng.com
RE: Bond stress in plain reinforcing
Formulaire de construction metallique
Moniteur, Paris, 1997
It seems it uses a mix of french codes from CM66 to EC3
RE: Bond stress in plain reinforcing
The hook on the end of smooth anchor rods is seldom, if ever, a standard hook. The anchor hook is quite a bit tighter and much shorter than a hooked reinforcing bar.
IIRC, The hook had been generally thought to provide the full development, but evidence says that hooked anchor rods do not provide adequate resistance to pull-out.
RE: Bond stress in plain reinforcing
"The bond stress for 16 mm rebars is about 1.75 MPa reached at a slip of about 0.18 mm; for 12 mm the values are 1.05 MPa and 0.03 mm respectively."
RE: Bond stress in plain reinforcing