The connection of the Unistrut “System 1” double layer grid space frame transfers loads statically indeterminately from a member to the connection plate through two lugs and a bolt. The connection is studied by Finite Element analysis, design code analysis and a series of experimental tests. There is quite good agreement between the analysis methods and fair agreement with the tests. The test series isolates the contributions of the individual load paths showing quite good correspondence. The failure of the lugs in an unpredicted shear mode is the major cause for discrepancies. However, analysis of that shear mode is consistent with the tests.
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