Show Bridge Superstructure Forces/Stresses/Displacements

Form:  Bridge Object Response Display, Bridge Response Data

Use the Home > Display > Show Bridge Superstructure Forces/Stresses command to review a bridge response plot for a bridge model after an analysis and design has been performed. The Bridge Object Response Display form also displays when the Graphical Results item is selected and the Display Graphical Results button is clicked on the Bridge Wizard.

Note: This form also displays after the Design/Rating > Superstructure Design> Run Super command or the Design/Rating > Load Rating > Run Rating command has been used.

1. Create a bridge model and perform an analysis and design.

2. Click the Home > Display > Show Bridge Superstructure Forces/Stresses/Displacements command to display the Bridge Object Response Display form or select the Graphical Results item on the Bridge Wizard and click the Display Graphical Results button. Use the options on the form to specify the parameters for displaying the response plot. Note that the form will display automatically immediately following design.

1. • Select Bridge Object drop-down list. Select the bridge object for which the bridge response plot is to be displayed.

   • Bridge Model Type display box. This display box shows the type of model:  spine, area, or solid. The type of model is selected on the Update Bridge Structural Model form.

   • Select Display Component

   • • Result Types drop-down list. Choose the type of bridge response to plot: Force, Stress, Design, Displacement, or Displacement - 10th Points. The corresponding response components that are available will be shown in a separate drop-down list.

     • For Force, these include axial force, shear, torsion, and moment.

     • For Stress, these include axial stress at various locations (e.g., top left, bottom center, envelopes, etc.) depending on the member type (bridge section, slab, beam, etc.)

     • For Design, these include various stresses, ratios, and rebar areas, depending upon the type of design request and bridge section.

     • For Displacement, or Displacement - 10th Points, these include the displacement component (vertical, transverse, longitudinal, or average longitudinal rotation) and location (e.g., top left, bottom center, etc.) depending on the member type (bridge section, slab, beam, etc.). Note that (1) displacement output is based on the bridge layout line coordinate system including grade and super-elevation; (2) for shear-web girders, the average longitudinal rotation is calculated based on the lateral displacements at the top and bottom of the web.

     • All results are plotted along the length of the bridge object at section-cut locations, except Displacement - 10th Points, which is plotted at 10 equal longitudinal intervals along each span.

     • Results For drop-down list. Choose to show forces/stresses/displacements for the entire bridge section, the individual girders (left exterior, interior 1, interior 2, ..., or right exterior), or the entire section plus all girders. For composite bridges, additional options for the forces for the individual beams and slabs are available. Note that for the composite steel I girder bridges and composite precast concrete I girder bridges, all the force outputs are based on the coordinate system without considering super-elevation along the bridge length. For all other bridge section types, all the force outputs are based on the coordinate system considering super-elevation along the bridge length.

     • Include Tendon Forces check box. Check this box to include the forces from the tendons in the displayed forces and moments acting on the superstructure or girder cross-section. When this option is used for a load case or load combination representing prestress load, the plotted results are the hyperstatic (or secondary) forces and moments. This option is not restricted to prestressing loads, but its meaning for other load cases and combinations is subject to interpretation by the user. This option is available only for bridge objects that contain tendons and, to be meaningful, it requires that the tendons be modeled as elements.

     • Show Selected Girder check box. Check this check box to illustrate the location of the girder in the model window (i.e., this option has no effect on the form). This check box has no effect when the Entire Bridge Section or Entire Section Plus All Girders has been selected in the Show Force For drop-down list.

   • Show Tabular Display of Current Plot area  

   • • Show Table button. Click the Show Table button to display the Bridge Response Data form. This form shows the response data in tabular form. The data are for display purposes only and cannot be edited using this form. Use the Edit menu > Copy command on the form to copy the data to the Windows Clipboard; use a standard Windows Paste command to paste the data into another program, such as Access. Use the Units drop-down list to change the units used on the form. The selected units will be used to display the response plot.

     • Export to Excel button. When this button is clicked, the program exports the specified force, stress, or displacement data to an Excel workbook and automatically launches Excel to display the downloaded data.  

1. • Load Case/Load Combo area and Case/Combo drop-down list. Select the load case or load combination for which forces or stresses are to be displayed from this drop-down list. (This option is included on the form when Force or Stress is selected as the component to be displayed.)

   • Show Vehicle Location area. This area is visible only when a moving load case is selected from the Case/Combo drop-down list and a single force, moment, or stress component is being displayed. Vehicle location data shows which vehicles are acting in each lane, and their longitudinal position within the lanes, for a given response component at a single section cut.

   • Enabled check box. When this check box is checked, a vertical orange cursor will be shown in the plot area to identify the section cut at which to display the vehicle location data, and all the control items within this area will be enabled.

   • Section Cut buttons. Click Forward or Backward button to move the cursor to the next pair of section cuts; click the Before or After radio button to choose the section cut just before or just after the cursor.

   • Display Table button. Click this button to display the Moving Load Vehicle Location Data form. This form shows the vehicle location data in tabular form. The data are for display purposes only and cannot be edited using this form. Use the Edit menu > Copy command on the form to copy the data to the Windows Clipboard; use a standard Windows Paste command to paste the data into another program, such as Excel or Access. Use the Units drop-down list to change the units used on the form. The selected units will be used to display the response plot.

   • Design/Rating area and Request drop-down list and D/C Limit check box. Select the design request to be illustrated. When the D/C Limit check box is checked, the program will add a graphical representation of that limit to the bridge response plot.(This option is included on the form when Design/Rating is selected as the component to be displayed..)

   • Units drop-down list. Use the displayed units or use this drop-down list to change the units for the form. The selected units will be used to display the response plot.

   • Multivalued Options. The availability of these options depends on the load case chosen in the Case/Combo drop-down list.

   • • Envelope Max/Min option. Choose this option to display the maximum and minimum results over all time steps.

     • Envelope Max option. Choose this option to display the maximum results over all time steps.

     • Envelope Min option. Choose this option to display the minimum results over all time steps.

     • Step selection box. Use this selection box to choose the number of steps to be included in the plot.

   • Bridge Response Plot display area. The plot is displayed in this area of the form. Use the horizontal scroll bar at the bottom of the display to move the mouse pointer along the plot to review data for specific points along the plot line.

   • Snap to Computed Response Points check box. When this check box is checked, CSiBridge snaps the small red dot to specific computed response points along the bridge response plot as the mouse is moved over the display. When this check box is unchecked, the small red dot moves freely along the plot line. The location of the small red dot is displayed in the Mouse Pointer Location display boxes.

   • Mouse Pointer Location display boxes. The display boxes in this area of the form show the location of the small red dot as the mouse pointer is moved over the plot. The distance values are in the currently selected units. The names of the display boxes are assumed to be self-explanatory.

   • Distance Measurement drop-down list. The displayed distance can be measured from the beginning of the bridge object or from the beginning of each span.

   • Distance Options. The distance options include measuring the distance along the layout line or along the individual girder lengths. The latter option is not available when showing results for the entire bridge section.

See Also

Bridge Analysis

Bridge Wizard

Link/Support Vehicle Response Components