Integral Nonlinear Analysis Of The Super High-rise Frame-core Tube Structure

With the high speed development of our country’s economy，a lot of super high-risebuildings appear，that the reliability and safety of the structure is evaluated and the weakparts of the structure is identified are important issues in rare earthquake，meanwhile，elastic-plastic analysis of the overall structure of high-rise buildings under earthquakeaction was done，which had very important theoretical significance and applicationvalue for the design and construction of the actual project. Therefore，this dissertationdevelops with a super high-rise frame-core tube structure background， the dynamiccharacteristics，earthquake response and overall seismic performance of super high-riseframe-core tube structure were studied and discussed，utilizing the non-linear timehistory analysis and the static nonlinear，the main research work and the results were asfollows：Elastic-plastic dynamic analysis of a super high-rise frame-core tube structure wasdiscussed by using large-scale finite element software ANSYS， and the calculationresults were verified through the design software ETABS， from which thecharacteristics of nature vibration was obtained. Based on the analysis of modal analysis，nonlinear seismic analysis of structure was carried out adopting the time-historyanalysis method. Inputting three different seismic waves to structure，and the structurewas calculated，meanwhile， the results including floor displacement angle envelopecurves， vertex displacement time-history curves， floor displacement curves andtime-history curve of roof acceleration were obtained，which were fully analyzed andcompared. The results show that the maximum damage of concrete exists in the bottomof Super High-rise Building with the Frame-core Tube Structure，the structure has noobvious weak story and maximal floor displacement angle occurs in the upper floors，and its value was less than the1/100of Fire Protection Design of Tall Buildings and canmeet the relevant code requirements for energy dissipation structures.Static elasto-plastic analysis of a super high-rise frame-core tube structure wasdiscussed by using SAP2000，the structure，uniformly distributed along its rise ortriangularly distributed，has been then calculated，from which the results including thestory drift，the base shear force-top displacement curves，floor displacement angleenvelope curves and the expansion of plastic hinges were obtained，and the seismicperformance of the structure was evaluated. It is concluded by analysis that base shear islarger under uniform load mode and vertex displacement is relatively smaller，and that maximum drift angle under inverted triangle load mode is larger than that underuniform load mode，which can meet the relevant code requirements， and that floordisplacement vary is gradually increasing with the stories increase，and that floordisplacement under uniform load mode is larger than that under the uniform load mode.Some plastic hinges emerged on beam，which can be repaired as soon as possible and atthe stage of life safety. There were not plastic hinges appearing on column，which meetthe seismic thoughts of strong column weak beam. For the the position of plastichinge appearance，which should be treated appropriately by stirrup densification.By comparing the results of correlation analysis of static elastoplastic and dynamicelastoplastic，the entire seismic performance and structural performance objectiveswere evaluated，and the results show that the structure has no obvious weak story andcan meet the code requirements for energy dissipation structures.