Page Comparison

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In v6.0.0, users have the ability to select an ASTM steel for automatic calculation of gamma factor 3.

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Fr Factors

Here the user can change any of the multiplication factors used in calculating the modulus of rupture (Fr).  The first factor is the generic normal weight concrete factor used in both the 5^th and 6^th Editions of LRFD, along with STND.  The second factor is only used in the 5^th Edition for the minimum steel cracking moment.  The lightweight concrete factors are used in all editions of LRFD prior to the 7^th Edition, along with STND and AREMA.  The 7^th Edition (and later) only uses the first factor, and uses this factor for both normal and lightweight concrete.  CHBDC uses none of these factors.

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Input values for the yield strength (fy), allowable stress, and modulus of elasticity (Es) of the reinforcing steel.  The reinforcing diameter is used by the program to compute the depth to the reinforcement during the design phase.  For the calculations of the critical section values, Eriksson Culvert uses the actual diameter of any either the calculated or assigned flexural reinforcement.  However, in Design Mode, at the time the program settles on a specific member thickness, the size of the reinforcing is not known, therefore the ‘reinforcing diameter’ is used to approximate the thickness of one layer of reinforcement.  If you are using mesh, then the default value of 1 inch may be too large.  You can also define the yield strength of the shear steel here as well.  Note that if you switch from rebar to mesh, the program will automatically change the steel yield as well, defaulting to 60 ksi for rebar and either 65 or 70 ksi for mesh.  However, the yield strength of the shear steel will not be changed.

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