Page Comparison

{live-template:Tutorial}

h1.\\
Modeling
GoalsThe purpose Twoof span continuous box girder concrete bridge with 4 websthis tutorial is supportedto onlydemonstrate bymanual twomodification bearings at each substructure location. These bearings are located between the most exterior and interior girders. Since bridge modelerof bridge bearings. The [bridge modeler|kb:Bridge modeler] automatically generates bearings. underModification eachis girder, the bearing links need to be modified then done outside of the bridge modeler. This tutorial h1.will Solutionfollow a Belowtwo-span iscontinuous outline of the procedure you can use to model the bearings in the desired location (the outline below discusses the procedure for the start abutment; the procedure would be very similar for the interior bent and end abutment):

(1) Use "Bridge > reinforced-concrete box-girder bridge with (4) web sections, supported by two bearings at each substructure location. These bearings are centered between each pair of exterior and interior girders. Users may manually modify start-abutment bearing locations through the following process:

\\

*1.* Use the 'Bridge' > 'Update Linked Bridge Model"' menu command to update the structural model.

(*2).* Uncheck  "'Bridge' > 'Auto Update Linked Bridge Objects"' to prevent the bridge modeler from overwriting manual changes introduced manually.

(*3).* Delete the interior-girder bearing links and associated joints created for the interior bearingsautomatically produced, as shown in Figure 1:

\\

!Manually_modify_bridge_bearings_1.png|align=center,border=1!

(4) Use "Edit > Move" menu command 

{center-text}Figure 1 - Delete interior bearings{center-text}

\\

*4.* Use the 'Edit' > 'Move' option to move the exterior-girder bearing links and associated joints (theseto representthe thelocation bearingsdesired foralong the exteriortransverse girders)direction, inas transverseshown bridgein directionFigure to2:
the desired locations:
\\

!Manually_modify_bridge_bearings_2.png|align=center,border=1!

{center-text}Figure 2 
(5) Modify the properties for- Move exterior bearings{center-text}

\\

*5.* Modify the bearing-link linksproperties as needednecessary.

PleaseAdditionally, please note that the bottom link connects the bent cap withto a joint at the bearing. locationThese (thelink properties assigned to this link represent thethose properties of the bearing). andThe the top link creates thea bearing joint with a joint at the bottom of the superstructure. (theThe properties assigned to this link simulate a rigid connection). 
Also note that there is a Further, the body constraint 'BOBJ-1 that essentially connects the' connects the start joint of each superstructure girder start joint withto joints at the bottom of the superstructure, located just above the bearings, as shown in Figure 3:

\\

!Manually_modify_bridge_bearings_3.png|align=center,border=1,width=1000px!

{center-text}Figure 
(6) Repeat the above procedure3 - Bridge bearings{center-text}

\\

*6.* Users may then repeat the procedures of this tutorial for the interior bent and end abutment.