RCPier - Spread Footings on Rock vs Soil

Hi there,

I'm checking a design calculation for an abutment on spread footings done in LEAP RCPier. I couldn't find any information in the user manual or input/analysis tabs to determine how bearing pressure is calculated for a wall bearing on soil or rock. Note, depending on this criteria, AASHTO requires bearing stress to be determined based on a uniform distribution (soil) or linearly distributed (rock).  

Any help on this matter would be appreciated.

Thanks

Parents
  • The design calculation for an abutment on spread footings done in LEAP RCPier will be similar to the spread footing design under a column.
    The footing can be defined only if user has selected Stem Wall option in abutment configuration screen. In this case, program assumes the footing is concentric with stem. If user wants to consider the effect of eccentricity, consider this effect during load definition.

    As per help file -- For isolated spread footings, forces and moments obtained from each load combination, at the top of the footing, are applied at the centroid of the footing. The footing is treated as a member with infinite stiffness. The bearing pressure at each corner is calculated, as follows: Q = (P/A) +- ( Mxx * Z / Ixx ) +- ( Mzz * x / Izz )
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  • The design calculation for an abutment on spread footings done in LEAP RCPier will be similar to the spread footing design under a column.
    The footing can be defined only if user has selected Stem Wall option in abutment configuration screen. In this case, program assumes the footing is concentric with stem. If user wants to consider the effect of eccentricity, consider this effect during load definition.

    As per help file -- For isolated spread footings, forces and moments obtained from each load combination, at the top of the footing, are applied at the centroid of the footing. The footing is treated as a member with infinite stiffness. The bearing pressure at each corner is calculated, as follows: Q = (P/A) +- ( Mxx * Z / Ixx ) +- ( Mzz * x / Izz )
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