Substructure Help

Auto Load Generation: Wind on Structure Screen

This screen is used for auto generating wind loads on structure. To start, select the Wind Angle from the Wind Angle list. The portion of the column subjected to wind load is measured by the elevation defined in the Elevation above which Wind Load acting textbox. Substructure applies the wind load to the column between this elevation and top of the column. To manually change the default wind pressure, deselect the check box and input the values for wind pressure in the fields under Wind Pressure for Superstructure and Wind Pressure for Substructure.

You can have the program generate wind loads on structure simultaneously for different wind angles by selecting the Generate for multiple angles check box and inputting the start and end wind angle values. In addition, you can generate the wind on live load at the same time as the wind load on structure for the same wind angle by selecting the Generate Wind on Live at the Same Time check box.

Depending bridge location, default pressure will be defined. Users can overwrite this value by uncheck the default check box. The default values for Drag coefficient Ch, Exposure Coefficient, Ce etc can be customized by the user. Once you entered all data, click the Generate button. The program will automatically generate the wind load on structure and return to the Loads: Load Data screen. Click OK to return to the Loads screen.

Note: The wind angle is measured from the normal of the bridge centerline (traffic direction) to the wind direction. It is positive if counterclockwise. The component of X-direction of a positive wind load is along the global X-direction.