Shear Performance of Stainless-Clad Bimetallic Steel H-section Beams
Based on the constitutive model of bimetallic steel,the effects of cladding ratio β on the stress-strain properties of the stainless-clad bimetallic steel(SBS)was clarified.The accuracy of the numerical method was verified through the bearing curve and failure mode of the experimental results.A parametric study including 300 numerical models was conducted,in which the parameters were β,aspect ratio of web a/hw and height to thickness ratio of web hw/tw.The effect of parameters on the shear bearing curve and ultimate bearing capacity of SBS H-section beams was systematically analyzed.The research results indicate that with increase in β,the yield plateau in the stress-strain curve of SBS increases,it gradually disappears,and the stress-strain performance of SBS gradually transforms from carbon steel to stainless steel.When β is relatively small,there is an obvious yield plateau in the stress-strain curve of SBS,which weakens the beneficial effect of strain hardening of SBS on the shear performance of H-section steel beams.With increase in β,the nonlinear strain hardening gradually strengthens.This leads to an improvement in the ductile performance and a gradual decrease in the strength performance of H-section steel beams.After verification,the current European design formulas for predicting the shear ultimate bearing capacity of SBS H-section beams are too conservative.Based on the results of parameter analysis,the predictive method including effects of β was proposed for the contribution from web.The research conclusion is helpful for promoting the engineering application of SBS.
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