Nonlinear springs represent the stiffness of the soil around the foundation of the structure. The behavior of these springs is nonlinear because the stiffness of the soil changes as the load on the structure increases. The springs are typically placed at the base of the foundation and are connected to the foundation and the surrounding soil.
In OpenBrIM, nonlinear springs are used to model SSI. These springs can be added to the model to simulate the behavior of the soil around the foundation. The stiffness of the springs can be adjusted based on the soil properties and the loading conditions. This allows the engineer to more accurately model the response of the structure to the soil and to optimize the design accordingly.
Please follow the instructions provided below to define construction of substructure bridge components.
| 1 | Navigate to Loading > Construction > Substructre > Pile. |  |
| 2 | Click three-dots icon on Stage cell and click select. | |
| 3 | Select "SubstrConstStage" as stage. |  |
| 4 | Click three-dots icon on Substructures Above cell and click pick. |  |
| 5 | Select all of the Substructures Above (Foundation) that were previously defined from the 3D View. | Figure will be added  |
| 6 | Then click Done. |
Follow the below steps to copy and paste all inputs from our data set.
| 1 | Go to Pile under Substructure on the tree view. |
| 2 | Copy Pile Construction from model inputs and paste into OpenBrIM. |
Copy the desired data with the automatic copy button in the upper left corner. Click on the first cell in and use the Ctrl+V shortcut to paste.  
If icon won’t appear, collapse page tree menu by clicking on arrow or using shortcut “[”.  While pasting large data, it would be handy to turn of Auto-refresh . 
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Pile |
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Pile Construction |
PC3 SubstrConstStage [RF1,RF2,F1] [] 1 |
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