Probabilistic Analysis Of Progressive Collapse Reliability Of Pre-stressed Assembled Concrete Frame Structures Under Earthquake Action

In 1968,the collapse of the Ronan Point apartment in the United Kingdom caused the progressive collapse of the building structure to be paid attention to by the engineering community.After several decades of research,a number of research results have been made,and an analysis has been put forward for the problem of progressive collapse methods and design recommendations,and the preparation of the relevant design procedures.However,there is little research on the progressive collapse problem of the widely popular assembly structure.In this paper,the prestressed concrete frame structure is used as the object,and the reliability analysis method is used as the means to study the progressive collapse performance under earthquake action.The prestressed assembled concrete frame structure improves the seismic capacity of the structure by improving the force performance of the assembled structure,so that it can be applied in the earthquake area.Therefore,it is of great significance to promote the application of prestressed assembled concrete frame structure in the earthquake area.The main contents of this paper are as follows:(1)The prestressed prefabricated concrete frame structure model was established and the deterministic analysis using Midas / Gen platform was used to provide the basis for the subsequent uncertainty analysis.The dynamic response of the structure after the initial failure of the different parts is studied by using the nonlinear dynamic demolition component method.The POA method is used to study the ability of the well structure and the damage structure to damage the earthquake after the initial failure.(2)Based on the analysis method of component reliability,the members whose structures are most likely to fail under the action of earthquake are identified.In this paper,a deterministic sampling method based on Latin hypercube sampling is used as the method of generating samples.By using the Pushover analysis method,the seismic capacity of the members is analyzed,and the seismic requirements of the members are obtained.Finally,the structural reliability of the members under earthquake is obtained.After comparing the results of the analysis of the components,the structures that are most likely to fail under the action of the earthquake are obtained.(3)The stochastic Pushdown analysis method is used to analyze the damage structure of the damage structure after the perfect structure and the most likely failure member,and the continuous collapse reliability of the structure and damage structure is obtainedwithout considering the earthquake action.The damage analysis of the damage structure is analyzed and the factors influencing the vertical collapse of the structure are studied by the sensitivity analysis.Through the seismic hazard analysis of the site,the probability of occurrence of seismic action is obtained.Based on the calculation of the probability of continuous collapse under the action of accidental load,the reliability analysis of the composite component,the conditional reliability analysis and the analysis of the site risk analysis,the failure probability of the whole structure under the earthquake is obtained.The seismic robustness of the structure is evaluated and analyzed.According to the results obtained,the preloading prestressed concrete frame structure established in this paper has a small probability of continuous collapse under the action of earthquake,and has good robustness.