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where f_s is 20,000 psi for normal exposure and 17,000 psi for severe exposure.
The strain gradient amplification factor (beta) in these equations is calculated as:
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It is permitted to use beta of 1.2 if h >= 16” and 1.35 if h < 16”.
It is also permitted to use 25 for the 4(2 + d_b/2)^2 term as a simplification. Example calculations are attached at bottom of this page.
Applying the Environmental Durability Factor in Eriksson Culvert
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Eriksson Culvert will then automatically calculate the required durability factors and multiply the design moments by them, creating a more conservative design. The calculated factors will be displayed in the text report for your reference:
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