Load Combination Definition
===============================


**Table** :ref:`tbLoadCombDef`


**PURPOSE**


This table is used to create the set of trucks, factors, and switches that are combined for capacity and rating calculations.     


**Parameters**

.. Include:: ../../tables/tbLoadCombDef.txt


.. rubric:: Name
..

    This is a unique name for this combination.

.. rubric:: Active
..

    You may only want to run some combinations when analyzing a bridge. Use this option to select which combinations will be analyzed and 
    then only those trucks used in the `active` combinations will be run.  

.. rubric:: Truck_A
..    

    One or two trucks may be included in a combination. You `must` define a `Truck_A` but a second truck is optional. This entry must 
    reference a truck defined in the :ref:`Truck Definition` table. 

.. rubric:: Truck_A_AxlFrcMult
..       

    Enter the multiplier that will be applied to each axle force for `Truck_A`. 

.. rubric:: Truck_B
..    

    One or two trucks may be included in a combination. You `must` define a `Truck_A` but this second truck is optional. This entry must 
    reference a truck defined in the :ref:`Truck Definition` table. 

.. rubric:: Truck_B_AxlFrcMult
..       

    Enter the multiplier that will be applied to each axle force for `Truck_B`.     

.. rubric:: Truck_C
..        

    This is a **special** entry for a uniform lane load truck that `must` be named `UNIFORM_LANE_1KPF` and defined the :ref:`Truck Definition` table.

.. rubric:: Truck_C_AxlFrcMult
..       

    Enter the multiplier that will be applied to each axle force for `Truck_C`.        


.. rubric:: LFR
..           

    When doing a LFR analysis, enter a `D` or `P` t specify rating factor to use.  
    D=Inventory&Operating  P=Overload Inv&Op

.. rubric:: LRFR
..           

    When doing a LRFR analysis, `H`, `L`, `P`, `E`, or `N` 
    (H)HL-93 Design  (L)Legal  (P)Permit-Overload  (E)Emergency  (N)Not Rated

.. rubric:: NegOnly
..      

    For LRFR set this to "Y" to `ONLY` rate this combination for negative moment.

.. rubric:: ReportFlag
..    

    The summary report include the summary, a copy of the input BDF file in fixed field format, and
    capacity trace at 10th points along a stringer. This capacity trace can get very very large and 
    might not be needed for all active combinations. Set this entry to `Y` to include the detailed 
    capacity calculations for this combination in the summary report.

**Example Entry**

.. image:: ../../image/load_combination.png
    :alt: image/load_combination.png