Modeling Goals
Two span continuous box girder concrete bridge with 4 webs is supported only
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This tutorial was originally for the bridge modeler in SAP2000, but the same concept also applies to CSiBridge. |
The purpose of this tutorial is to demonstrate manual modification of bridge bearings. The bridge modeler automatically generates bearings. Modification is then done outside of the bridge modeler. This tutorial will follow a two-span continuous reinforced-concrete box-girder bridge with four web sections, supported by two bearings at each substructure location. These bearings are located between the most centered between each pair of exterior and interior girders. Since BrIM generates bearings under each girder, the bearing links need to be modified outside of BrIM.
Solution
Below is 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 "BrIM Users may manually modify start-abutment bearing locations through the following process:
Use the Bridge > Update Linked Bridge Model
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menu
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to update the structural model.
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Uncheck
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Bridge > Auto Update Linked Bridge Objects
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to prevent the
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bridge modeler from overwriting manual changes
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.
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automatically produced, as shown in Figure 1:
(4) Use "
Figure 1 - Delete interior bearings
Use the Edit > Move
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option to move the exterior-girder bearing links and associated joints
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(5) Modify the properties for the bearing links as needed.
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to the location desired along the transverse direction, as shown in Figure 2:
Figure 2 - Move exterior bearings
Modify the bearing-link properties as necessary.
Additionally, please note that the bottom link connects the bent cap
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to a joint at the bearing
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. These link properties represent those of the bearing
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. The top link creates
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a bearing joint
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at the bottom of the superstructure
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. The properties assigned to this link simulate a rigid connection
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. Further, the body constraint BOBJ-1
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connects the start joint of each superstructure girder
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to joints at the bottom of the superstructure, located just above the bearings, as shown in Figure 3:
(6) Repeat the above procedure
Figure 3 - Bridge bearings
Users may then repeat the procedures of this tutorial for the interior bent and end abutment.
Metadata
Name: Manual modification of bridge bearings
Description: Guidelines for the manual modification of bridge bearings automatically created by the bridge modeler.
Program: SAP2000
Program Version: 12.0.2
Model ID: na
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TO DO: Figure 3 seems to be corrupted. Prepare and upload revised figure. |