Research On Super-high Steel Chimney System

Research on steel chimney structural system is of importance since it could be great potentially applied in the thermal power industry. This paper takes Baosteel chimney and Jinling chimney as representatives of tower chimney and a novel self-standing steel chimney, respectively, and investigates their properties of model dynamic analysis, wind resistance ability and earthquake resistance ability. The structural and economical characteristics of these two chimney style are compared. It is finally analyzed and discussed the optimal shapes of the super-height steel chimney's plate surface, elevation, and web member. The main contents are as follows:The tower steel chimney and self-standing steel chimney have been analyzed in the aspects of mode dynamic dynamics, wind resistance, and earthquake resistance. With numerical wind tunnel method of Computational Fluid Dynamics (CFD) technology, the shape coefficient of double-tube chimney has been calculated. A conclusion shows that tubes of the tower steel chimney withstand only a little horizontal load, most of which are resisted by the tower, and tube thickness is determined by stress. On the contrary, tubes of new self-standing steel chimney are the main structure to resist a large part of the horizontal load. The tube materials on tower steel chimney are not fully used because the thickness is designed for the anti-corrosion purpose, but the utilization of the ones on the novel self-standing chimney shows higher with larger tube thickness. Conclusions can provide guidance for the designs and analysis of similar projects.Comparisons between high-rise tower and new self-standing chimney with single-tube and double-tube system of the same geometric condition are made in the aspects of economical and structural advantages. It is concluded that the new self-standing single-tube chimney system can be applied on both single-tube structures and double-tube systems with better material and economical utilization. The high-rise tower has better structural performance. The conclusions can be applied on the structural selections of super-high steel chimney.With different types of model calculations and comparisons, the optimistic plane, vertical elevation, and web member forms in the structure have all been determined. The conclusions show that the triangle plane is the most economical shape of all the plane styles considering the same heights. The moments caused by wind load should be considered in the optimization of the elevation form. The rigid web member system had better be used rather than flexible web member one to raise the structural stiffness. The web member forms with "Double criss-cross" shape shows the best in the evaluations of stiffness and material utilization, and those with "X" shaped the worst. The conclusion can be applied on the selections of structural system design...