Application of reverse method for length calculation in overall stability test of steel compression bar
The overall stable bearing capacity of steel compression bar is closely related to the initial geometric defects,residual stresses,elastic-plastic properties of steel and end constraints.The experimental observation shows that the actual measured ultimate bearing capacity of the compression bar is higher than the buckling load determined by the geometric length of the compression bar.The key reason for this phenomenon is that it is difficult for the supports at both ends of the compression bar to achieve the ideal hinged state,and the actual strong constraint of the supports reduces the calculated length of the components,thus improving the stable ulti-mate bearing capacity of the steel compression bar.According to the traditional component stability theory,a re-verse calculation method of length is proposed through the load-displacement relationship in the elastic stage of the overall stability bearing capacity test of compression bar.The correctness of this method is verified by relia-ble finite element model analysis.This method is applied to the actual test data analysis of the overall stable bearing capacity of steel compression bars,which not only reasonably explains the test phenomena and results,but also eliminates the influence of different bearing forms on the overall stable bearing capacity of steel com-pression bars.The relevant conclusions can provide reference for the experimental research on the overall sta-bility bearing capacity of steel compression bars.
reverse method for length calculationsteel compression baroverall stability bearing capacityfinite element analysis
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