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These factors are the gamma factors present in the new Mcr equation introduced in the 6th Edition (LRFD Eq. 5.7.3.3.2-1/5.6.3.3-1). Currently Eriksson Culvert only uses the first and third gamma factors. CHBDC uses neither of these factors.
In v6.0.0, users have the ability to select an ASTM steel for automatic calculation of gamma factor 3.
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Steel Type | Gamma Factor 3 |
|---|---|
ASTM A615, grade 60 | 0.67 |
ASTM A615, grade 75 | 0.75 |
ASTM A615, grade 80 | 0.76 |
ASTM A706, grade 60 | 0.75 |
ASTM A706, grade 80 | 0. |
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80 | |
ASTM A1035, grade 100 | 0.67 |
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 5th and 6th Editions of LRFD, along with STND. The second factor is only used in the 5th Edition for the minimum steel cracking moment. The lightweight concrete factors are used in all editions of LRFD prior to the 7th Edition, along with STND and AREMA. The 7th 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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