Study On The Progressive Collapse Resistance Performance Of Steel Frame-Bent Structures Of Large Thermal Power Plant

In recent years, the incidents of progressive collapse of buildings have been happened many times. The ability of structures to resist progressive collapse has been highly regarded. Due to special requirements for operation and technology arrangement, the layout of large thermal power plant is complex which existing split-level, heavy vertical loads, the distribution of load and mass in spatial is unevenly, the force transfer path is not too clear. This building is a complex structure with plane irregularity and vertical stiffness irregularity. At the present stage, the research about large thermal power plant under normal condition has been basically mature. But the research method about the ability of resistance to progressive collapse remains to be studied. As the important lifeline engineering of large thermal power plants happen progressive collapse caused by abnormal events. Such as impact, terrorist attacks and so on. It will cause a large number of casualties and lead to enormous economic losses and bad social influence to the country. There have been many disasters caused by structures which are lack of the ability of resistance to progressive collapse in history. Therefore, it has great practical significance to analyze the ability of resistance to progressive collapse of large thermal power plants. The resistance to progressive collapse of steel frame-bent structures of a1000WM large thermal power plant was analyzed by finite element analysis software SAP2000in this paper. The importance of each column of first floor was discussed in the whole structure by using the method of analyzing the component importance. On this basis, the steel frame-bent structure of large thermal power plant was conducted nonlinear static and nonlinear dynamic analysis by alternate path method. Then the ability of resistance to progressive collapse of residual structure under four conditions was evaluated. The analysis results indicate that the importance coefficient of higher columns are mostly distributed in deaerator bay and coal bunker bay. In the four analysis conditions, residual structure has better resistance to progressive collapse. The ability of resistance to progressive collapse is the weakest when the inner column of ground floor of steel frame-bent structure was removed. Invalid column adjacent structural members are important in the process of redistribution of internal force and the results of nonlinear static analysis are conservative.Finally, according to the analysis results and the characteristics of steel frame-bent structures of large thermal power plant, some measures to enhance the ability of resistance to progressive collapse are proposed. Providing some reference to the design of resisting progressive collapse of steel structures of large thermal power plants.