Numerical Analysis Of Progressive Collapse Of The Prestressed Assembly PC Framework Based On Partial Prestressing Rations

As the economy and technology has been rapidly developed in china, construction industrialization is promoted. Accelerating the construction progress and improving work efficiency has become the development trend of engineering. Compared to the past cast structure with high labor intensity, long construction period, serious waste of materials and other shortcomings, assembled concrete structure is widely used.However, when unexpected events happen, the structure of progressive collapse gradually enter people’s field,and people fully realize the importance of improving the building’s resistance to continuous collapse.The object of this paper is the prestressed assembly PC frame structure system,and the biggest difference between the structure system and the general cast-in-place frame structure is that the beam column connections are semirigid joint connections. In this paper, the concept of partial prestressed rations is used to characterize the semirigidity of the joints, and the connection between the partial prestressed rations and the semirigid joints of the beam column is given,and the influence of semirigidity on the force and deformation of the assembled girder is analyzed.For nonlinear static analysis using the finite element software pushdown modeling, it studies the progressive collapse resistance change and component failure sequencethe with different partial prestressed rations under the specified component failure. Based on the load factor displacement curve, the influence of the semirigidity on the structure of the progressive collapse resistance is obtained and appropriate partial presterssed rations is got. In accordance with the existing typical frame structure to resist progressive collapse mechanism, such as beam mechanism and catenary mechanism, respectively to" remove "the corresponding part of the typical column structure analysis, it is concluded that the corresponding typical column failure to resist progressive collapse design method and correct the daily design personnel against progressive collapse design methods for understanding some of the misunderstanding, especially local strengthening component method and tie strength. This paper analyzes how to select the position of the component when using local reinforcement component method and get applicable conditions of tie strength.