Analysis And Design Of Reinforced Concrete Frame Structure To Resist Progressive Collapse Under Accidental Load

The security of building structure has attracted more and more attention.Europe and the United States have earlier carried out research on the structural progressive collapse resistance,and promulgated the corresponding norms for the design of structural progressive collapse resistance.In contrast,China lacks professional norms for the design of structural progressive collapse resistance although there are some norms.In order to carry out the normative design of the research on structural progressive collapse resistance,on the basis of summarizing foreign norms for the design of structural progressive collapse resistance,this paper,uses the SAP2000 engineering software to make analysis of the progressive collapse resistance of the domestic standard design by using the non-linear dynamic demolition component method and evaluates the structure using the collapse rate index.This paper makes a comparative analysis of the differences between China and the United States in terms of load specifications and structural design systems,proposing a suitable accidental load combination.And the non-linear static demolition component method is used to redesign the progressive collapse resistance for the structure.By comparing the normative design results of the United States,the result of the accidental load design is safe and suitable for the domestic standard design system.The main research conclusions are as follows:1.The collapse resistance performance of the structure is analyzed by non-linear dynamic alternative path method,and the collapse rate index is introduced to evaluate the structure.The collapse resistance performance of the structure decreases with the increase of the floor,with the lowest collapse rate of the interior pillar redundancy,and the highest of the long-side center pillar.2.In the process of structural collapse,two kinds of resistance mechanisms appear on the upper beam components of the exhaustion column,and different exhaustion columns have different resistance mechanisms.3.The difference between the load systems of China and the United States is sorted out,the accidental load combination suitable for China’s normative design is proposed,and by using this composition,the collapse resistance design is made.Compared to the United States normative load combination,it has high security.