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Test Verification of the Effect of Stress Gradient on Webs of Cee and Zee Sections



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Test Verification of the Effect of Stress Gradient on Webs of Cee and Zee Sections FINAL REPORT March 2002 submitted to the American Iron and Steel Institute and the Metal Building Manufacturers Association by Ben Schafer and Cheng Yu Executive Summary This report details the work performed under a research grant funded by the American Iron and Steel Institute AISI and the Metal Building Manufacturers Association MBMA entitled Test Verification of the Effect of Stress Gradient on Webs of Cee and Zee Sections The project evolved in response to the inconclusive nature of existing test data on Cees and Zees in bending and the need for a set of simple repeatable tests on industry standard sections that account for typical details in current practice and provide the actual bending capacity in local buckling Findings and recommendations from the research follow Existing design procedures for the effective width strength of webs AISI 1996 are theoretically inconsistent discontinuous and ignore the a local buckling b distortional buckling influence of the flange Modifications adopted in 5 in Mcr My 0 98 27 in Mcr My 0 74 the new North American Specification AISI of 8 5 in deep t 0 073 in Zee Elastic buckling 2002 partially remove the web flange interaction issue but introduce a strength discontinuity at web width to flange width ratios h b of 4 Existing test data on Cees and Zees in bending has inordinate scatter compared with the test topredicted ratio for the AISI Specification Previous research did not distinguish between local and distortional buckling failures so it is difficult to resolve the data meaningfully However capacity of members with panels through fastened to the compression flange and h b ratios less than 4 generally agree well with existing AISI 1996 standards Academic testing on Cees and Zees without attached panels consistently produce lower strength predictions than AISI 1996 Developing a new test procedure requires that specific attention be paid to



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