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Module 1: Design of Batten Plates and Column Splices

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Design of Batten Plates
 
Batten plates are used when the built-up sections are carrying axially compression load. They are placed perpendicular to the axis of the column
 
The steps in designing batten systems are:
 


Find the transverse shear. Then calculate the longitudinal shear along the column axis and moment at each connection
Calculate the effective slenderness ratio of the battened column
Find the gauge distance of the section and the distance between bolt centers
Calculate the spacing of batten plates
Determine the size of the battens
Calculate the size of intermediate battens
Design the end connections for the batten system to resist calculated longitudinal shear and moment

Design of Column Splices
 
Splices are used in joining members whose length is less than the required length. They are designed as short columns.
 
The basic steps in designing column splices are:

Determine the load for the design of the splice
Assume splice plates act as short columns (with zero slenderness ratio)
Calculate the cross-sectional area of the splice plate
Determine the thickness of the splice plate
Assume nominal diameter of bolts for connection and then compute the strength of the bolt
In case of a bearing plate, determine the length and width and thickness of the plate

Splices can be designed due to axial force, moment, and shear force.