Research on Stability Strengthening Configuration of Column in Precipitator Casing

• 1、School of Environment and Civil Engineering, Jiangnan University, Wuxi214122

Abstract：Since the column in precipitator casing always 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 geometric imperfection and residual stress, the buckling mechanism of column was investigated by non-linear finite element method firstly. Since being influenced by the wall stressed skin effect, the buckling of column occurs on the high compressive stress region being 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 adopting the strengthening configuration measurement.

Keywords： structural engineering column in casing stability strengthening configuration finite element method initial imperfection stressed skin effect