Concentrated Side Load Converted to Uniform Load for Connections

Some concentrated side loads do not generate a specific connection detail on the BC Calc® design report. This may be because the concentrated load is smoothed and converted into a uniform load per linear foot. (PLF)

This uniform load is used to determine the maximum PLF load across the entire member and simplify the connection of multiple plies in the field.

A Boise Cascade rule in BC Calc® determines if the load can be smoothed or not. The analysis converts concentrated side loads to a uniform load when two or more consecutive gaps of 24" or less exist between concentrated side loads and the sum of gaps between adjacent loads is greater than 24". Loads fitting this criteria are converted to PLF loads 2' long (load / 2') centered at the location of the concentrated load.

For example: Beam BM1 (2-Ply) supports a series of floor joists and a single beam (BM2) on one side. 

  • The loads from BM2 and the nearest other point load are factored and combined.
  • The total is divided by two, generating the maximum PLF load along the member.
  • The 3,781 lb/ft load is used to generate the connection table from which to choose. Only adequate fasteners are shown in the list.

 

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 Note the design load in the connections table below.

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