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Select which bars you would like epoxied, the options are ‘none’, ‘top steel if fill < 2ft’, ‘all top slab steel’, and ‘all steel’. If ‘top steel if fill < 2ft’ is selected the program will always assume the top layer of steel in the top slab is epoxy coated for fill depths less than 2 feet. Otherwise, all steel in the culvert is assumed to be uncoated at all fill depths. If ‘all steel’ is selected, the program will assume all steel is epoxy coated at all fill depths.
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If checked, the program will calculate the shear capacity of the concrete using the iterative beta method in LRFD Appendix B5. This value is then compared to the shear capacity already calculated using the internal decision table (see Section 5.7/5.6) and the larger of the two values is used for the current member.
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If checked, the program will calculate the shear capacity of the top slab of a 3-sided culvert with more than 2 foot of fill using LRFD 5.14.5.3/5.12.7.3, which is usually only used in 4-sided culverts. However, some states allow this provision to be used for 3-sided culverts as well.
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In LRFD, when the shear capacity of the concrete is calculated using the iterative approach in Appendix B5, a preliminary estimate of the reinforcing steel is based on moment demand. Then the area of steel is used to calculate the shear capacity and checked against the shear demand. If the preliminary estimate of the area of reinforcing steel is unsatisfactory the program enters a loop inside the shear calculations to increase the area of steel until this requirement it met. This area of steel should be limited to around 2.0 in2in2/foot for practical purposes, and can be adjusted up or down here. If this limit of the reinforcing steel cannot be satisfied then the program increases the member thickness, recalculating the structural steel demand, and re-starts the shear demand loop.
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Select the appropriate exposure option for your design, the options are ‘normal’ and ‘severe’. This is used in computing the environmental durability factors, defined in ACI-350.
Additional Analysis Points:
Starting in v6.0.0, uses have the ability to add additional points that they would like data displayed for in the Text Report. To do this, select the appropriate checkboxes for the location you would like to add and enter the location. All locations are measured from the centerline of the orthogonal member.
For example, to add an additional an additional analysis point in the wall 10” below the centerline of the top slab, you would check the option for “Walls: Top” and enter “10.0” in the text box.
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Additionally, if you’d like to add additional analysis points 24” from the centerline of both walls, you’d select the “left” and “right” options and enter “24.0” to each textbox.
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Creating additional analysis points will display extra information in the following locations:
“Unfactored Moments/Shears Due to All Loads” tables:
“Unfactored Moments and Shears Due to Truck Loads” tables:
“Load Combination Results at Tenth Points” table:
