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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
  • Specified Compressive Strength VS Average Compressive Strength . . .
    The mix design results are then tested by doing compressive strength tests on at least 2 specimens tested at 28 days The designer would still use f'c of 3500 for his computations in the design, you are just using the 1200 psi buffer to make sure that the 3500 psi requirement is met at 28 days
  • Min Flex. Reinf for Slabs - ACI (concrete) Code Issues | Eng . . . - Eng-Tips
    Another minimum from ACI 318, 10 5, gets to a higher percentage for a minimum Either 4 3 As required for flexure, or 3((f'c)<1 2) fy Having bending in both directions, (and thus reinforcement in both faces), could have an area of steel close to the amount given by double the temperature shrinkage percentage
  • Difference between %d and %f? - MATLAB Answers - MATLAB Central - MathWorks
    While you can use %f to print integer values (as per the second line of code below) if you try to use %d to print non-integer values it will actually switch to a different specifier (%e I believe, as per the note in the Notable Behavior of Conversions with Formatting Operators section of the description of the formatSpec input argument on the fprintf documentation page )
  • 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?
  • Direct tensile strength of concrete - Structural engineering general . . .
    ACI 318-11 chapter 22 (plain concrete) gives you 5*(f' c)^0 5, which for 5000 psi concrete is about 353 psi, not to far off from your test results Upvote 0 Downvote Jul 29, 2016





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