Performance Research Of Progressive Collapse On Prestressed Concrete Frame Structure

Progressive collapse of building structures under accidental loads can lead to serious economic losses, casualties and severe social impacts. It is important duty of structural engineers to study the progressive collapse performance of building structures and the design method of progressive collapse. In recent years, structural engineers pay more attention on the research of progressive collapse. The initial study on the progressive collapse performance of our country about building structure started relatively lately, and made some achievements about it, but the related research is still unable to meet the needs of engineering design.Prestressed concrete technology has become one of the important applications in structural engineering since it entered the practical application of structural engineering in 1920s. Structure progressive collapse studies mainly concentrated in the structure type of concrete and steel, but prestressed concrete structure of progressive collapse performance is rarely studied, this paper apply dynamic finite element analysis software LS-DYNA to compare prestressed concrete frame structure with reinforced concrete frame structure by using alternative load path method for progressive collapse performance,and draw the conclusion that:prestressed concrete frame structure of anti progressive collapse ability is better than that of reinforced concrete frame structure. And studied the progressive collapse performance of bonded prestressed concrete and non-bonded prestressed concrete structures, and puts forward some measures to improve progressive collapse performance of prestressed concrete structure and offer the reference for the prestressed concrete frame structure progressive collapse performance research.The research content of this paper mainly includes the following four aspects:1) according to the existing research results, to determine the alternative load path method and nonlinear dynamic numerical analysis method to study progressive collapse of prestressed concrete frame structure in this paper.2) Take a typical five story reinforced concrete frame structure,bonded prestressed concrete frame structure and non-bonded prestressed concrete frame structure for example, using explicit dynamic finite element analysis software LS-DYNA to establish finite element model, and remove the bottom side column and the bottom middle column to do progressive collapse simulation analysis.3) Take a five-story four-span reinforced concrete frame structure and prestressed concrete frame structure for example, using explicit dynamic finite element analysis software LS-DYNA to establish finite element model, and remove the bottom corner column, the long side middle column and the short side middle column to do progressive collapse simulation analysis.4) Analyze and summarize the advantages and disadvantages of the prestressed concrete frame structure in the aspect of the progressive collapse resistance, and put forward the measures to improve the performance of the prestressed concrete frame structure.