Study On Seismic Performance Target Of Ultra High-rise Building And Comparison Of Structural Scheme

With the development of global economy integration and technology revolution,more modern buildings have emerged to be high-rise structure,multiple functions,complex construction.The super-tall building seismic design not only occupies a major position in the design of building structures,but also the key design,difficult design.Since modern architectural function is complex and diverse and height exceeding limit,it requires the civil engineering focusing on the collapse causing by earthquake and new effective analyzing methods.Besides,economic losses and people’s safety should be estimated and balanced through the whole design and analyzing progress.Therefore,the guiding ideology high-rise building has been adjusted from the traditional three-level of fortification and two-stage of seismic design to the performance-based seismic design gradually.Base on reading a large number of domestic and foreign literature and related standards,the topic of this thesis is to indicate the background of the performance-based seismic design theory and its application in civil realm,to indicate the importance and requirement by applying the seismic ideology into the process of architecture design.Through the comparison and analysis of earthquake risk level,the performance level and the division of the performance goal in the main seismic code between our country and foreign,it has been clear about the specifications in the relation and distinction between the above three aspects.By an engineering example based on the theory of PBSD as the research object,the engineering example’s design,analysis,research and demonstration of its structure’s safety are described.And the comparison and analysis of the two schemes under the same performance objective include the frequent earthquake elastic analysis,the fortification intensity earthquake elastic analysis and unyielding analysis and the rare earthquake dynamic elastic-plastic time history analysis,the analysis of frequent earthquake and the fortification intensity earthquake use the Chinese academy of architecture’s STAWE.The rare earthquake analysis uses the large general finite element analysis software ABAQUS.This article selects a natural seismic wave,bi-directional input method is adopted to improve the dynamic elastic-plastic time history analysis,the establishment of the model uses the PKPM-ABAQU interface program which is researched and developed independently by China Northeast Architectural Design&Research Institute.By contrast,the improved scheme 2 relative to the scheme 1 has decreased the negative impact of the stiffness mutation and under different seismic risk level can meet the requirements of the performance of the selected level,its stress more reasonable,most of the key parts of concrete shear wall and columns’ impairment factors and steel plastic strain is small.Through the comparative analysis of two kinds of schemes based on the performance of seismic design,it provide the basis for subsequent structure optimization design of the project for our country.