Since the column in precipitator casing mainly presents buckling failure,the stability strengthening method for column was investigated so as to improve its buckling capacity and optimize the structural design of precipitator equipment.For the structure system composed of stiffened wallboard and H-Shaped steel column in precipitator casing,in consideration of initial imperfection,the buckling mechanism of column was investigated by non-linear finite element method first.Since being influenced by the wall stressed skin effect,the buckling of column occurs on the high compressive stress region adjacent to the column top.The column presents the interactive buckling that the overall flexural-torsional buckling occurs on the front half section composed of the front flange and the web and the local buckling occurs simultaneously on the web.Based on the buckling characteristics,the strengthening configuration measurement for enhancing column buckling capacity was proposed,that is,the strengthening steel plates would be welded on both sides of the front flange of the column in top region,and its upper and lower sides would be welded with the L-shaped diaphragms.The influences of several configuration parameters on the column buckling capacity were investigated,including the width,thickness and the locating range of the strengthening steel plates and the L-shaped diaphragm thickness.Consequently,a rational design method of the strengthening configuration for enhancing column buckling capacity was proposed.The buckling capacity of the column can be increased significantly by employing the strengthening configuration measurement.
precipitatorcolumn in casingstability strengthening configurationfinite element methodinitial imperfectiondiaphragm-braced effect
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