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Summary of 8.5" deep Zees |
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professor ben schafer's thin-walled structures research group - johns hopkins university |
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Testing on the 8.5" deep Zees has been completed. Tensile testing is currently underway (75% complete). Preliminary post-processing of the data has been completed (assuming fy=55 ksi , results will only change slightly from this value). The test-to-predicted ratio for the tested specimens is provided in the tables and figures below.
The results indicate (1) in this test setup the panel to purlin fastener configuration is highly influential (2) a purlin with a fully engaged panel successfully restricts distortional buckling (3) a purlin with a fully engaged panel has strength similar to AISI (1996) predictions (4) significant inelastic reserve capacity exists in the thicker purlins
The "073" specimens were used to determine the proper fastener configuration - the large variation in strength in these specimens is due to this experimentation. 8.57073-3 and 4 have the fastener configuration that was ultimately used on all tests. The "065" specimens were damaged prior to testing and are not indicative of the expected performance of this purlin. The "105" and "120" specimens had significant inelastic reserve capacity.
Work continues...
Ben Schafer, last updated 04/15/02 |
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