Performance-based Seismic Research And Analysis Of An Over-limit High-rise Building

The increasing urbanization of the population and the increasing population have made the per capita land use less and less,and more and more high-rise buildings are emerging.Conventional high-rise buildings are suitable for the "three-level,two-stage" seismic design method of China's "Code for Seismic Building Design" and "Technical Regulations for Concrete for High-rise Buildings".However,due to the influence of topography and the different functional requirements,more and more high-rise buildings with complex flat and building elevation have emerged.These buildings go beyond the requirements of existing codes.In order to achieve the seismic performance goals of these over-constrained buildings,special methods and technical means are needed to conduct special analysis.Through reviewing a large number of literatures,this paper gives a brief overview of the concept,theoretical background,research methods and research contents of performance-based seismic design.Compared with the traditional seismic design idea,the difference between the two is related.The analysis shows that the performance-based seismic design theory can well solve the existing problems in the current over-limit engineering.In this paper,a practical over-limit project is taken as the research object,and the seismic design method based on performance is used to study and analyze the project and demonstrate the seismic performance of the structure.And did the following work:1.analyze the over-limit type of the structure,determine its over-limit situation,and determine its performance target according to the structure characteristics and over-limit situation.2.the software pkpk-satwe and midas-building were used for modeling and analysis,and the "seven indicators" of the structure were compared to determine the correctness of the model.Pkpk-satwe is used for elastic time-history analysis and mode decomposition response spectrum method for envelope design.Through the enveloping design of medium and small earthquakes,the arrangement and reinforcement of the components are determined.The structure can meet theperformance requirement under the action of moderate earthquake by non-yield analysis.SUSAGE software is used to analyze the elastoplastic behavior of the structure under large earthquake,and the damage condition of the component is obtained.Seismic strengthening measures are taken to the weak parts of floors so that the structure can meet the requirements of performance targets under the action of large earthquakes.3.For the case of the opening of the slab in the project and the impact of the staggered floor on the slab,MIDAS-GEN was used to conduct a special analysis of the slab.Through the stress analysis,it is concluded that the stress of the floor of the podium transition to the tower is large.In order to strengthen the floor slabs for these places,and calculate the internal forces of each slab according to the floor slab stress under the large earthquake,the slabs are reinforced according to the internal force results.It is recommended that the finite element method be used to calculate the reinforcement in the complex structure from the podium to the floor with a large change in stiffness such as the standard layer.4.In the Elastic-Plastic Analysis of Structures,The structural coupling beam in this project has been damaged.A new type of coupling beam is applied to the structure for this situation,which can be used as a new seismic strengthening measure in engineering.Through the analysis of this kind of coupling beam,it can be concluded that the new-structured coupling beam can not only meet the bearing capacity requirements in the small and medium-seismic design,but also the ordinary coupling beam has been destroyed under the same strain condition compared with the ordinary coupling beam.The new coupling beam still has a high bearing capacity,which can increase the coupling beam from severe damage to moderate damage.As a new engineering strengthening measure,it can improve the seismic performance of the structure well.This type of construction can also be used when other components are seriously damaged,which provides a new idea for seismic strengthening measures.Through the above analysis,it is finally concluded that the structure of this paper can meet the requirements of seismic performance level.