RC Pier

When entering loads manually for a wall type pier, what is RC Pier referring to as cap loads?  Is this the pile cap?  Some load screens also have a tab for footing, so this does not seem to make sense.  Is it the top of the pier even though a wall type pier does not have a cap?

When entering vertical earth loads for wall type piers, RC pier requires the entry to be in kips per linear foot instead of kips per square foot on the footing tab screen.  Is this a load per unit width or should you multiply the earth pressure by the entire width of the footing to determine this number?

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  • Let me try to answer one question at a time.

    1) In the previous versions Leap Bridge did not had an option to model wall pier and one of the procedure t0 model the wall pier was to model a single column with a pier cap and then increase the length of the column perpendicular to the traffic so that it is modeled as wall and in those versions the bearing were located on the pier caps and the loads were applied on cap loads.
    In the recent versions a new default wall pier option has been provided and now the bearing are placed directly on the wall.
    the cap load nomenclature is left like that because of the legacy instead should have been mentioned as Wall Load.
    I shall forward this issue to the development team so that they can fix the nomenclature.

    2) yes i agree with your findings , While designing wall type pier ,For vertical earth loads , user needs to entry the kips per linear foot instead of kips per square foot on the footing tab screen.
    this load is kips/ft and user needs to multiply the earth pressure by the entire width of the footing to determine this number
Reply
  • Let me try to answer one question at a time.

    1) In the previous versions Leap Bridge did not had an option to model wall pier and one of the procedure t0 model the wall pier was to model a single column with a pier cap and then increase the length of the column perpendicular to the traffic so that it is modeled as wall and in those versions the bearing were located on the pier caps and the loads were applied on cap loads.
    In the recent versions a new default wall pier option has been provided and now the bearing are placed directly on the wall.
    the cap load nomenclature is left like that because of the legacy instead should have been mentioned as Wall Load.
    I shall forward this issue to the development team so that they can fix the nomenclature.

    2) yes i agree with your findings , While designing wall type pier ,For vertical earth loads , user needs to entry the kips per linear foot instead of kips per square foot on the footing tab screen.
    this load is kips/ft and user needs to multiply the earth pressure by the entire width of the footing to determine this number
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