Lane Data Form

A lane is a chain of frame objects, with an optional eccentricity if the vehicles are located to one side or the other of the frame objects.

Tip:  Click the Home > View >   Set Display Options command to access the Display Options for Active Window form, and in the Frames/Cables/Tendons area, check the Labels check box to display the frame label in the specified window(s). This can be helpful in selecting the frames for the lane definition process.

• Lane Name edit box/display box. If the Advanced > Define (Method 1 below) was used to access the form, accept the default or enter another name in this edit box. If the Advanced > Assign (Method 2 below) was used to access the form, the name in the display box is the name specified when the lane was defined and that name cannot be changed here.

• Frame edit box. If the Advanced > Define command used to access the form, enter the label of the frame representing the lane. The label will appear in the Frame display area when the Add button is clicked. If the Advanced > Assign command was used to access the form, the edit box will display the ID of the frame object selected before the Advanced > Assign command was clicked.

• Centerline Offset edit box. Enter the distance of the lane centerline (in the current length units) from the frame representing the lane.

• Lane Width edit box. Enter the width of the lane in the current length units.

• • Add button. After entering values in the Frame, Centerline Offset, and Lane Width edit boxes, click the Add button to add the definition.

1. • Insert button. Enter a label ID in the Frame edit box and click the Insert button to insert the newly entered ID in sequential order in the Frame display box.

• • Modify button.

  1. 1. Highlight a frame ID in the display area.

     2. Type a new ID or centerline offset or lane width value in the appropriate edit box(es).

     3. Click the Modify button.

  • Delete button.

  1. 1. Highlight a frame ID in the display area.

     2. Click the Delete button to remove the frame object from the lane definition.

• Reverse Order button. Click the Reverse Order button to reorder the data according to frame IDs.

• Reverse Sign button. Click the Reverse Sign button to change positive centerline offset values to negative or negative values to positive. The Reverse Sign button acts on all values, so it is not necessary to select a value before using the button.

• Move Lane button. Click this button to display the Move Lane form and move the lane a specified distance or to specified coordinates.

• Objects Loaded by Lane area. Use the options in this area of the form to specify how the lane loads should be determined:

• • Program Determined option. CSiBridge will determine loading on the lanes using the data specified on the Standard Vehicle Data form or the Vehicle Data form.

  • Group option. If the Group option is selected, use the associated drop-down list to specify the Group name. Use this option in conjunction with the Advanced > Define > Groups command to control the loads applied to the lanes.

• Lane Load Discretization area. Use the edit boxes in this area of the form to specify discretization of the load Along the Lane and Across the Lane, as necessary. The values are entered in the current length units.

• Additional Lane Load Discretization Parameters Along Lane area. Use the options in this area of the form to specify the maximum load discretization as a fraction of the span and lane lengths.

• • Discretization Length Not Greater Than 1/{value} of Span Length check box and value. Use this check box to specify that the load be distributed on the span based on a fraction of the span length. Checking this check box ensures proportional load discretization on every span in this definition. This can be helpful, for example, when multiple spans have been defined and the length of a span(s) is less than the length specified in the Lane Load Discretization - Along Lane area of this form.

  • Discretization Length Not Greater Than 1/{value} of Lane Length check box and value. Use this check box to specify that the load be distributed on the lane based on a fraction of the lane length. Checking this check box ensures proportional load discretization on every lane in this definition. This can be helpful, for example, when multiple lanes have been defined and the length of a lane(s) is less than the length specified in the Lane Load Discretization - Along Lane area of this form.

Note:  The smallest value specified for lane load discretization and discretization based on fractional values of span or lane lengths is the controlling value for distributing the load on a span or lane.

• Display Color.  The color that will be used to display the section on-screen in the model. Click on the "Display Color" text or the small sample square of the color to bring up the Color form. Select the desired new color on the Color form and click the OK button.

Note:  After the lane is defined based on frames (i.e., Method 1 above),  the Advanced > Assign > Frames > Lane command must be used to assign frame objects to the defined lane (i.e., Method 2 above).

See Also

Bridge Wizard

Bridge Analysis