First, the minimum reinforcement requirements will be calculated. The tensile reinforcement provided must be enough to develop a factored flexural resistance at least equal to the lesser of 1.2 times the cracking strength or 1.33 times the factored moment from the applicable strength load combinations.
As with the backwall, the minimum reinforcement requirements will be calculated for the stem. The tensile reinforcement provided must be enough to develop a factored flexural resistance at least equal to the lesser of 1.2 times the cracking strength or 1.33 times the factored moment from the applicable strength load combinations.
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1.2 times the cracking moment controls the minimum reinforcement requirements. 1.2 times the cracking moment is also greater than the controlling applied factored moment, therefore, use 1.2 times the cracking moment for design.
The abutment footing is designed for flexure in the heel and toe, one-way and two-way shear action, and the control of cracking by the distribution of reinforcement. For footings supported by pile foundations, the footing and pile foundation designs are interdependent and should be designed concurrently to be more efficient. Refer to Design Step P for the pile foundation design.
The footing toe critical section minimum tensile reinforcement requirements will be calculated. The tensile reinforcement provided must be enough to develop a factored flexural resistance at least equal to the lesser of 1.2 times the cracking strength or 1.33 times the factored moment from the applicable strength load combinations.
1.2 times the cracking moment controls the minimum reinforcement requirements. 1.2 times the cracking moment is also greater than the factored footing toe moment. Therefore, use 1.2 times the cracking moment to design the toe flexure reinforcement.
The footing heel critical section minimum tensile reinforcement requirements will be calculated. The tensile reinforcement provided must be enough to develop a factored flexural resistance at least equal to the lesser of 1.2 times the cracking strength or 1.33 times the factored moment from the applicable strength load combinations.
1.2 times the cracking moment controls the minimum reinforcement requirements. 1.2 times the cracking moment is also greater than the factored wingwall stem moment. Therefore, use 1.2 times the cracking moment to design the wingwall stem flexure reinforcement. 2ff7e9595c
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