Study On Overall Stability Of Cellular Steel Columns About Strong Axis

Cellular members are formed by cutting H-section steels or ordinary I-steels, andthen rejoining the two halves by welding makers. Compared with the original solid-webmembers, they have the advantage of light weight, large moment of inertia ofcross-section, high bearing capacity, economic, delight appearance, easy to install pipesand wires. However, analysis and researches on cellular steel columns are notdevelopment enough currently, and there is no design methods in the relevantspecification or standard. Therefore it largely restricts the use of cellular steel columnsin the civil engineering.Firstly, the validity of the cellular steel columns’ model was verified by usingANSYS software through the related literatures. Considered the influence ofgeometrical, material nonlinearity and residual stresses, the cellular steel columns’overall stability bearing under centric axial load was researched when memberslenderness rations, hole sizes, the spacing between holes, height-width ratio of the weband width-thickness of the flange changed, and then the varying patterns were obtained.Compared with the same-sized non-perforated steel column on the ultimate load bearingcapacity and its design formula, the calculation approach of the overall stability bearingcapacity of the cellular steel columns under the axis pressure was proposed.Secondly, the influence of member slenderness rations, load eccentricity ratios,hole sizes, the spacing between holes, height-width ratio of the web, width-thickness ofthe flange and residual stresses on the ultimate bearing capacity of the cellular steelcolumns under eccentric compression was carried out, and then a pratical formula for predicting ultimate strengths of eccentrically compressed cellular steel columns wasreceived.