Steel properties used to manufacture wood truss metal connector plates

Skaggs, T.D.; Woeste, F.E.; Lewis, S.L.

Steel properties used to manufacture wood truss metal connector plates

1995

Skaggs, T.D. | Woeste, F.E. | Lewis, S.L.

A study was conducted by surveying members of the Truss Plate Institute (TPI) on properties of steel used in the production of metal connector plates. Three out of eight truss plate manufactures (TPMs) responded with summary statistics, and one of the three provided raw data for both ASTM grade B (1993a) and grade 60 (1993b) steel coils. Statistical distributions were fit to the data and several conclusions were drawn. Ultimate strength of steel is an important attribute for modeling failure of a metal-plate-connected truss joints. A truss plate manufacturer could feasibly sample a coil of steel, and find that the ultimate and yield strengths are slightly below minimum specified standards. A truss simulation aimed at establishing minimum performance in a load test should include steel that is close to minimum specified ultimate strength. If average performance of populations of trusses is of interest, the steel properties should be modeled as random variables. Yield strength and ultimate strength of the samples were found to be positively correlated for both grade B and grade 60 steel. The estimated correlation coefficients ranged from 0.46 to 0.79.

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