Study On Behavior Of Steel Reinforced Concrete Composite Structure Of Nuclear Power Plants To Resist Progressive Collapse

The ability of resistance to structure progressive collapse is defined as follows: an initial local failure lead to structure initial damage,then residual structure can reach a new steady state through adjusting the internal forces and can prevent a larger scale damagein the surrounding area.Structure progressive collapse that will result in serious property damage and personal injury should get enough attention,so it has great practical significance to study the ability of resistance to progressive collapse of large nuclear power plants.Compared with the traditional steel structure and reinforced concrete structure,the SRC structure is been applied and developed widely more and more because it develops adequately the advantages of two kinds of structure.In this paper,in order to research the performance of resisting progressive collapse through the alternate path method,a steel reinforced concrete composite structure model was established through the SAP2000 analysis platform.The main achievements can be summarized as follows:(1)Introduced the research status at home and abroad of the progressive collapse of building structure,compared relevant design specifications and standards.Then,some progressive collapse research methods and criteria are chose from them,providing a basis for research work of this paper.(2)Chose planar frame and spatial frame as analysis models.Nonlinear dynamic analysis method is used to research the ability of resistance to progressivecollapse of structure under several typical conditions,and research the internal force distribution regularities.Nonlinear static analysis method is used to determine reasonable values of dynamic amplification factor.(3)Two single column failure conditions are chose fornonlinear static analysis to preliminarily study resistance mechanism of structure resistance progressive collapse.(4)Strengthened the key component of structural model and compared results of two analysis,and therefore some reasonable suggestions are proposed to reduce the progressive collapses risk.The results indicate that unbalanced load of structure is shared by adjacent components after the column failure,the effect of a column failure is so small that does not result in structure progressive collapse;however,two adjacent column failure may cause risk of structure progressive collapse.The results of all working conditions show that longitudinal frame beams are always the first part to yield,structural damage process can be divided into three stages according to the different deformation degree.A better design to strengthen components located in A axis and E axis can effectively reduce the risk of residual structure progressive collapse.