D8.B.13 Column With Lacings And Battens
For columns with large loads it is desirable to build rolled sections at a distance and inter-connect them. The joining of element sections is done by two ways:
Double channel sections (back-to-back and face-to-face) can be joined either by lacing or by batten plates having riveted or welded connection.
The following table gives the parameters that are required for Lacing or batten design. These parameters will have to be provided in unit NEW MMS along with parameters defined in D8.B.4 Design Parameters.
|Parameter Name||Default Value||Description|
Type of joining
|COG||0.0 mm||Center of gravity of the channel. This parameter is used when member properties are defined through user provided table using GENERAL option.|
|DBL||20 mm||Nominal diameter of rivet|
Used when member properties are defined through user provided table using GENERAL option.
32 mm (riveted connection)
25 mm (welded connection)
|FVB||100 N/mm2||Allowable shear stress in rivet|
|FYB||300 N/mm2||Allowable bearing stress in rivet|
|SPA||0.0 mm||Spacing between double channels. This parameter is used when member properties are defined through user provided table using GENERAL option.|
|THETA||50 degree||Angle of inclination of lacing bars. It should lie between 40 degree and 70 degree.|
|WMIN||6 mm||Minimum thickness of weld|
|WSTR||108 N/mm2||Allowable welding stress|