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| 1 | Navigate to Bracing > External Diaphragm Several structural elements are used to ensure that the two Tub Girders work together structurally, and one of these elements is the "External Diaphragm”. | 
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| 2 | Click three-dots icon on Girders cell and pick the two Tub Girders (G1 & G2) between which the External Diaphragm will be placed. | |
| 3 | As the project calls for Define 5 External Diaphragms , this number of diaphragms has been definedwith the following inputs. |  |
| 4 | Also Skew Angle value is 0. | |
| 5 | Since our project has 4 pier-end points, assign the "Pier-End" type to the External Diaphragm for the first 4 rows. Assign the "Intermediate" type to the External Diaphragm for the last row. |  |
| 6 | Click three-dots icon on Select Pier/End cell and pick location as in the figure.
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| 7 | Enter the following data for Offset from Pier/End [ft] as in the figure |  |
| 8 | Click three-dots icon on Material cell and assign the material type of all external diaphragms to A709_50W. | |
| 9 | You can make adjustments to the "Section Details" and "Stiffener" tabs if you wish. |   |
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