Design Line

The DESIGN_LINE and DESIGN_LINE_DATA tables define the design line for Cone Resistance and all correlations. In the case of Cone Resistance the data is written to the CPT_DATA table, and can display on log and fence reports. For correlations the data is optionally displayed on Graph reports, and not written to CPT Data. You can assign the Design Line to use on the Project Parameter and Point Parameter tables.

To be able to print a design line on the qc and qt columns on the log reports, the Design line must first be defined in the DESIGN_LINE and DESIGN_LINE_DATA tables.

To enter data in the DESIGN_LINE_DATA table (lower screen); enter a Design Line ID in the DESIGN_LINE table (upper screen). Enter a description if desired.

Then click on the DESIGN_LINE_DATA table. Each row represents a node (point or corner) in the Design Line, where the Elevation or Depth represents the vertical axis and the Cone_Resistance represents the horizontal axis. The Node ID determines the order in which the nodes are drawn, as the Design Line is constructed by drawing a line from one node to the next.

When the values in either the DESIGN_LINE or DESIGN_LINE_DATA tables are modified, you will be prompted with the following:

Every row in the CPT_DATA table has a Cone_Resistance_Design_Line value, which is calculated based on which Design Line is assigned and the depth of the current row. Therefore, it is necessary to recalculate the CPT_DATA table to reflect any changes made in these tables if an existing Design Line is modified. However, if entering a new Design Line, it is unlikely the new Design Line is assigned to any PointIDs, so it is unnecessary to recalculate the CPT_DATA table.

The Elevation value will always take precedence over Depth when calculating the Design Line. If there are both Elevation and Depth values in this table, then only the Elevation values are used, and the Depth values are ignored. Only if the entire Elevation column is left blank, the Depth values are used.

Once the Design Lines have been defined, they can be assigned to PointIDs in the CPT_POINT_PARAMETERS or CPT_PROJECT_PARAMETERS table. The two fields in this table related to the Design Line are Design_Line and Show_Design_Line. The Design_Line field is a pick list of the design Lines defined in the DESIGN_LINE Table, and the Show_Design_Line field is a check box which determines whether the Design Line is shown on the CPT log reports or not. The Design Line is represented on the CPT log reports as a thick black line.