06-28-2012, 06:45 AM
Inelastic buckling of steel struts under cyclic load reversals
Black, R. Gary; Wenger, W. A.; Popov, Egor P.
UCB/EERC-80/40, Earthquake Engineering Research Center, University of California, Berkeley, 1980-10, 174 pages (530/B538/1980)
Cyclic axial loading experiments simulating severe seismic conditions are described for 24 structural steel struts of sizes and shapes typically employed as braces in small to moderately large steel buildings. The cross-sectional geometries of the specimens were also chosen to model the larger, heavier struts. Six of the 24 members were pinned at one end and fixed at the other, while the remaining 18 were pinned at both ends. The range of cross-sectional shapes included wide flanges, double-angles, double-channels, structural tees, thin- and thick-walled pipes, and thin- and thick-walled square tubes. The responses of the specimens are evaluated and special attention paid to the effects of cross-sectional shape, end conditions, and slenderness ratio using hysteretic envelopes. While investigating the major parameters that influence a member's performance under cyclic loading, some important properties were recognized and quantified. Reduction factors were developed, which can account for the Bauschinger effect and initial curvature of struts. These factors can be used with an American Iron and Steel Inst. code-determined load to estimate the deteriorating compressive capacity of a strut during a few consecutive cycles of full inelastic load reversals. Some design recommendations are made for builtup members likely to experience severe load reversals.
PDF 45.02 MB | RAR 36.39 MB
Black, R. Gary; Wenger, W. A.; Popov, Egor P.
UCB/EERC-80/40, Earthquake Engineering Research Center, University of California, Berkeley, 1980-10, 174 pages (530/B538/1980)
Cyclic axial loading experiments simulating severe seismic conditions are described for 24 structural steel struts of sizes and shapes typically employed as braces in small to moderately large steel buildings. The cross-sectional geometries of the specimens were also chosen to model the larger, heavier struts. Six of the 24 members were pinned at one end and fixed at the other, while the remaining 18 were pinned at both ends. The range of cross-sectional shapes included wide flanges, double-angles, double-channels, structural tees, thin- and thick-walled pipes, and thin- and thick-walled square tubes. The responses of the specimens are evaluated and special attention paid to the effects of cross-sectional shape, end conditions, and slenderness ratio using hysteretic envelopes. While investigating the major parameters that influence a member's performance under cyclic loading, some important properties were recognized and quantified. Reduction factors were developed, which can account for the Bauschinger effect and initial curvature of struts. These factors can be used with an American Iron and Steel Inst. code-determined load to estimate the deteriorating compressive capacity of a strut during a few consecutive cycles of full inelastic load reversals. Some design recommendations are made for builtup members likely to experience severe load reversals.
PDF 45.02 MB | RAR 36.39 MB
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