Shear Strength of Mass Concrete
Shear Strength of Mass Concrete
(OP)
Good Evening Guys
I have a simple question: What is the shear strength of mass concrete? I know some people use 0.34n/mm2, which relates to the formula in BS8110. Of course it would relate to the compressive strength, but how is it calculated? I have searched the forum as I would have thought this to be quite a simple question, but could not find any relevant posts.
If anyone could shed some light please
Thanks
I have a simple question: What is the shear strength of mass concrete? I know some people use 0.34n/mm2, which relates to the formula in BS8110. Of course it would relate to the compressive strength, but how is it calculated? I have searched the forum as I would have thought this to be quite a simple question, but could not find any relevant posts.
If anyone could shed some light please
Thanks






RE: Shear Strength of Mass Concrete
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Shear Strength of Mass Concrete
That's about 6 MPa!
There must be a factor missing.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Shear Strength of Mass Concrete
For two way action, there are other requirements.
RE: Shear Strength of Mass Concrete
RE: Shear Strength of Mass Concrete
Shear strength comes from tensile strength of concrete, some friction, some dowel action and whether your concrete mass is in tension or compression.
Dowel action and type of stress are tough to follow, but friction can be reliable.In regular beams for example friction is usually ignored, in deep beams it is not.
Have you got the book by McGregor? Got good science in it.
respects
ijr
RE: Shear Strength of Mass Concrete
Approximate actual shear capacity for a rectangular section is 2*((f'c)^0.5)bd
Allowable (ACI 22.5.4) 4/3*((f'c)^0.5)bd
RE: Shear Strength of Mass Concrete
One way: Vn=(4/3)*sqrt(f'c)*bw*h
RE: Shear Strength of Mass Concrete
λ = 1.0 for normal concrete (0.75 for low-density concrete)
φc = 0.6 (resistance factor for concrete)
For 25 Mpa concrete, Vc = 0.6 by the Canadian code, nearly twice the value in the Australian code.
BA
RE: Shear Strength of Mass Concrete
RE: Shear Strength of Mass Concrete