Analysis On Progressive Collapse Resistance Of Prefabricated Reinforced Concrete Column To Steel Beam Composite Frame Structure

The traditional construction method has the disadvantages of high labor intensity,serious environmental pollution,high energy consumption and backward construction method and so on.Therefore,the prefabricated building is being vigorously supported and developed.More and more attention has been paid to the development of assembled RCS composite frame structure.However,the fabricated reinforced concrete column steel beam composite frame structure(abbreviated as the fabricated RCS composite frame structure)is an important branch of the fabricated structure system,and its development has been paid more and more attention by the engineering community.However,the assembled RCS composite frame structure is a new type of structure,and its integrity and continuous collapse resistance are not yet mature.In this paper,the continuous collapse resistance of assembled RCS composite frame structure is analyzed.The main work and research conclusions are as follows:(1)According to the current code,a five story 3 x 5-span assembled reinforced concrete column steel beam composite frame structure is designed by using the structural design software PKPM.The finite element structural analysis software SAP2000 is used to analyze the structure,and the performance-3 d structural analysis software is used to compare and verify the analysis.The analysis results show that the calculation results of the two analysis software are similar,and the assembled reinforcement is similar The design of concrete column steel beam composite frame structure is reasonable and meets the specification requirements.(2)Taking the above five story 3 × 5-span assembled RCS composite frame structure as the analysis object,assuming that the beam column joint is rigid connection,the continuous collapse analysis of the structure is carried out based on the component removal method,and four removal conditions are defined,namely,the removal of corner columns,the removal of long side middle columns,the removal of short side middle columns and the removal of internal columns;after the removal of the main components,the stress and resistance of the structure are analyzed The mechanism of continuous collapse is analyzed.The analysis shows that the mechanism of continuous collapse resistance of the structure develops from the beam mechanism to the catenary mechanism through the transition stage.The possibility of continuous collapse of the structure is to remove the corner column,remove the long side middle column,remove the internal column and remove the short side middle column.(3)Taking the above five story 3 × 5-span assembled RCS composite frame structure as the analysis object assuming that when the beam column joint is semi-rigid connection,changing the value of the semi-rigid joint stiffness,the influence of the value of the joint stiffness on the continuous collapse resistance of the assembled RCS composite frame structure is analyzed.The results show that for the rigid semi-rigid joints,the displacement of the assembled RCS composite frame structure is smaller,the structure is more stable,and the continuous collapse is not easy to occur;the beam column joints are semi-rigid connections and rigid connections,which experience similar collapse mechanism for the whole frame structure,but the beam column semi-rigid connection assembled RCS composite frame structure is resistant to continuous collapse can be better.(4)The influence of X-brace on the continuous collapse resistance of the assembled RCS composite frame structure is analyzed.The results show that X-brace can effectively improve the continuous collapse resistance of the assembled RCS composite frame structure.