Experimental study and analysis on mechanical behavior of support bottom plate directly connected welded hollow hemisphere joints
To investigate the mechanical properties of support bottom plate directly connected welded hollow hemisphere joints under tension and compression,eight specimens were designed and manufactured.The failure modes,load-displacement curves and load-strain curves of the joints were obtained by test and finite element analysis method.The results show that the failure modes of the specimens under compression condition are hemisphere first yields and the branch pipe then yields,the branch pipe yields and hemisphere yields,while under tension condition,the hemisphere first yields and then cracks appear on the surface of the hemisphere at the intersection of the branch and hemisphere.The joint bearing capacity varies with the hemispherical diameter,hemispherical thickness,branch pipe diameter and stress conditions,and has nothing to do with branch pipe wall thickness.In the process of loading,specimen with branch pipes subjected to tension and pressure respectively first enter the yield state at the measuring point where the branch tube intersects with the hemisphere,and the most unfavorable position of the specimens under other loading conditions is the top of the hemisphere.Based on the parametric analysis of 218 finite element models under compression and tension conditions,the calculation formula for the bearing capacity of the joints was fitted and proposed by nonlinear analysis,and the influence of stiffeners on the ultimate bearing capacity of the joints was considered,the improvement coefficient was given finally.
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