In order to solve the problems of traditional partially encased composite columns(PEC columns),including easy deformation and buckling of webs,weak synergistic effect with concrete,and easy separation,corrugated web PEC column with corrugated steel plate instead of flat steel plate was proposed.Considering four key factors:strong and weak axis direction,corrugated web direction,transverse tie bar spacing and eccentricity,ten corrugated web PEC column specimens were designed,and eccentric loading experiments were carried out.The test results show that the failure modes of PEC columns with corrugated webs under eccentric compression are the same,manifested as bulging deformation of compression side flange and crushing failure of concrete.Compared to the specimen around weak axis,the bearing capacity and ductility of the specimen around strong axis can be increased by 61.20%and 63.06%at most,respectively;the bearing capacity and initial stiffness of vertical corrugated web specimens are higher than those of transverse corrugated web specimens;the bearing capacity of the specimen with smaller eccentricity is higher than that of the specimen with larger eccentricity;by reducing the spacing of transverse tie bars,the ductility of the specimen can be improved by 75.16%at most after reaching the peak load.The eccentric compression model of the corrugated web PEC column was established by ABAQUS finite element software.The formula for calculating the eccentric bearing capacity of vertical corrugated web PEC column is fitted based on comparing the test results and combining the existing relevant specifications for PEC column.The difference between the theoretical and experimental value is within 10%.
关键词
波形腹板/部分包覆组合柱/偏心受压试验/有限元模拟/压弯承载力
Key words
corrugated web/PEC column/eccentric compression test/finite element simulation/eccentric bearing capacity
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