Elastic Buckling Analysis Of Wedge Webs Under The Combined Action Of Bending, Shearing And Local Pressure

Based on the finite element simulation and theoretical analysis,this paper studies the elastic buckling under the combined action of bending,shear and local pressure.The first study of pure bending buckling of tapered beam web under the condition of considering the unequal end moment ratio,plate area ratio,tapering ratio,web thickness ratio,flange width thickness ratio and other factors on the elastic buckling of tapered beam web impact.The results show that when the change of unequal end moment ratio belongs to-1≤η≤1,when η≥0 is generated,the elastic buckling load will be unequal end moment ratio decreases;When theη<0 is generated,the critical load of the buckling decreases with the decrease of the absolute value|η|,and the reduced amplitude decreases with the same curvature.In general,the effect of the outcrossing of the web of the wedge beam on the elastic buckling critical load of the wedge beam web is greater than that of the co-curvature.Secondly,combined with the wedge beam web by buckling analysis of local loading time,the bending moment and local compression under the combined effect of considering buckling of tapered beam flange web binding was studied,and found that the critical conditions and ordinary I-beam expression similarity and applies to wedge beam web by the combined effect of buckling of I-beam the bending moment and local load stress underFinally,combined with the existing wedge beam web shear and shear effect under the condition of local compression elastic buckling critical condition in bending,using the method of spatial coordinate analysis is derived for considering bending,shear and compression loads of three wedge beam web elastic buckling critical condition formula of results of finite element analysis and theoretical calculation,it is found that when the constraint effect of the flange on the web is small,the error of the formula is different from that of the web The ratio of the aspect ratio α=L/H increases.When the constraint effect of the flange on the web is large,the error of the equation decreases with the increase of the aspect ratio α=L/H small.