Analysis Of Seismic Response And Vulnerability Of Coupled Super High-rise Frame Core Tube Structure And Tower Crane In Construction Stage

With the development of social economy,the number of super high-rise buildings has continuously increased,and the height has also constantly broken through,and the structural system has become more and more complex.The average construction period of super high-rise buildings is as long as two years.The construction period of large-scale super high-rise buildings even exceeds five years.According to statistics,China's engineering collapse accidents continue to occur,with an average of less than two days.In recent years,such frequent plate movements indicate that the Earth has entered an active period of earthquakes.The construction of super high-rise buildings has not yet been fully formed and cannot be supported by a complete structural system.In the event of an earthquake,the loss will be heavy.Therefore,the research of the seismic performance of the super high-rise main structure and its equipment on the structure under strong earthquakes during the construction phase is of great significance for safe construction.This article is based on the time-freezing method in the slow time-varying mechanics in the theory of time-variation mechanics in construction,combined with the construction of super-high-rise frame core barrels leading the construction,the outer frame synchronously following the construction technology and external hanging inner tower cranes and other construction technologies.The earthquake response law and vulnerability of the construction crane and the main structure of the high-rise in construction are analyzed.In the analysis of the main structure,firstly,the super construction and high-rise construction period recommendation values are determined based on statistics,and the earthquake activity parameters are determined in combination with the seismic probability analysis function.Discrete construction process,combined with the degeneration of concrete materials during construction,analyzes the main body structure's response to different stage?different tower crane working conditions and various construction conditions of high-medium low-lying areas.By comparing the values of displacement between layers,the overall trend of the structure is that as the construction progresses,the response of the structure becomes more pronounced,and the strengthening layer has a significant anti-side effect in the middle zone.The response analysis of the earthquake action during the construction process needs to fully consider the construction process and construction status of the structure to assess the danger phase correctly.In the analysis of dangerous conditions of tower cranes,considering the coupling effect between the main structure and the tower crane,an overall finite element model for the construction of the super high-rise main structure and tower crane was established to study response rules and dangerous conditions of tower crane equipment in different constructions stage under earthquake.By comparing the displacement values of the tower crane's apex,it is found that the different dangerous rotation conditions are different in different construction phases.The dangerous elevation angle conditions are the same,and they are all dangerous when the elevation angle is low.In order to effectively predict the seismic damage and loss of the main structure and the tower crane equipment during the construction phase of major structural projects,a analysis method for the vulnerability of the tower crane and main structure were proposed.Discrete the construction process,establish the structural finite element model in different construction stages,select the seismic wave for incremental dynamic analysis,determine the performance level and the value of limit state and calculate the probability that the super high-rise construction subject structure exceeds each limit state based on probability significance.The analysis shows that the phase with the highest probability of the main structure and exceeding the limit of normal use is the construction to the middle stage.The highest probability of tower cranes exceeding the normal limit of use is the construction to the high section of the structure.