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  • fcu vs fc - Structural engineering general discussion - Eng-Tips
    A commonly used relationship that compares cylinder and cube strength is f'c = 0 8 fcu Upvote 0 Downvote
  • Modulus of Rupture - ACI (concrete) Code Issues - Eng-Tips
    The 7 5*sq rt f'c is for deflections only It isn't a strength calculation MacGregor Wight note that the mean modulus of rupture is 8 3*sq rt f'c, so the 7 5 makes sense for deflections 5*sq rt f'c is closer to the lower bound value, which would make sense for strength calculations
  • Plain concrete shear strength - Structural engineering general . . .
    Chapter 22 has no references at all, but the commentary indicated the expression is derived from v=VQ Ib (Mech of Materials equation for shear stress) I suspect the 4 3 part comes from multiplying the shear stress from Chapter 11 (2*sqrt(f'c)) by 2 3 2 3 being the inverse of 3 2 - the maximum stress shear for a rectangular cross section
  • Concrete Strength Requirements - ACI 318-11 Table 4. 2. 1 1
    "Minimum f`c for exposure class F1 is 4,500 psi " class F1 = Concrete exposed to freezing and thawing cycles and occasional exposure to moisture This is being specified for a duplex I'm doing the project management on for a contractor This seams pretty extreme to me
  • 28 day vs. 56 day concrete breaks 4 - Eng-Tips
    If the lower f'c is acceptable, then no further efforts are required and the concrete can be accepted Steps still should be taken by the contractor to increase the compressive strength of the concrete for future mixes 2 If the lower f'c is found to be critical to the performance of the structure, then further testing should be performed
  • Historic Concrete Strength - Structural engineering general discussion
    There is an ACI 318 predecessor code for 1927, Serial Designation A-1A-27T, Page 650 has indications of F'c as low as 1500 psi ACI501-36T, is the equivalent ACI318-36 Has the lowest F'c at 2000 psi By 1941 the code was officially ACI318-41 That being said, I generally agree with WARose, I normally see 2-3 5ksi
  • Shear Av,min in ACI 318-19 1 - Eng-Tips
    Your best bet is to probably reach out to ACI for clarification but sure looks like they keep making reference to Vc as if it was the old Φ2λ√f'c b w d throughout multiple sections before finally defining it as something else in 22 5 5, the way they reorganized 318 is like a really awful choose your own adventure book where you always die
  • CSA A23. 3 S6: dv and f´c 1 - Eng-Tips
    So as I understand you, f´c is a percentile value strength and definetly not a average strength In Germany we also use the system with the exposure conditions So f e we select the strength 40MPa which is an specified characteristic strength which means for us that there is a propability of failure of 5% that the actual strength might be
  • 7 day concrete strength - Structural engineering general discussion
    Here is a typical formula for calculating strength based on time for quot;normal quot; concrete You have to know the design or expected f'c t is time in days since the concrete was cast f'ci= f'c*(t (4 00+0 85t)) If you don't know the f'c, back into it using the 7-day break value Then use that f'c value to calculate your 28-day strength
  • AS 3600 Commentary on Punching Shear - Eng-Tips
    However, reading the AS 3600 Commentary on this section, it states that using closed ties, studs, or shear heads allows the use of 0 5*sqrt(f'c) Depending on your beta-h ratio of the column,fcv can be significantly less than 0 5*sqrt(f'c) (limited to max 0 34) Is using 0 5 when providing closed ties other shear reinforcement unconservative?





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