Seismic Performance Analysis Of An Over-limit Building

Over-constrained buildings refer to a type of building that exceeds national standards,including torsional irregularities,high over-limits,plane bumps,sudden changes in vertical stiffness,etc.As the economy continues to develop,people are increasingly demanding the function and appearance of buildings.It is followed by a large number of over-limit buildings that flood into people’s horizons.The reason why the specification has strict requirements for over-constrained buildings is that such buildings have more complex traits under the action of earthquakes,and their space is more open and the layout is variable.With the increase of horizontal and vertical loads,The lateral stiffness of thestructure is decreasing.Under the triple action of seismic load,wind load and gravity load,the whole structure will cause obvious additional effects and exhibit geometric nonlinear characteristics.Therefore,gravity should be used in the calculation.The effects of second-order effects on structural internal forces and stability are taken into account.This paper mainly studies the seismic response of over-constrained buildings under the earthquakes,fortifications and rare earthquakes,so as to accurately evaluate the seismic performance of the structure and better protect the lives and property of the people.The actual project selected in this paper is the student dormitory-canteen construction project using the advanced energy dissipation technology Changzhi Medical College.The performance-based seismic design concept is used to judge the seismic performance of the structure under different horizontal earthquakes,and then pass the software.Analytical calculations are performed to ensure performance objectives of the structure at different seismic levels.The main research contents are as follows:1)The concept of over-construction,the method and significance of seismic design,and the related development ofenergy-absorbing dampers.2)The seismic response of the structure in the case of multiple earthquakes is mainly analyzed by the SATWE and PMSAP procedures,and is supplemented by elastic time history analysis.The results show that the structure can maintain the elastic state under the action of small earthquakes,and has a certain safety reserve,achieving the performance level of “small earthquake is not bad”.3)A brief introduction to the two calculation methods and differences under the action of the medium earthquake.The seismic response of the structure under the fortified earthquake is calculated and analyzed by the SATWE program using the medium-seismic elastic design method and the medium-shock non-yield design method.The tensile test of the wall of the shear wall of the bottom reinforcement zone shows that the structure meets the established performance requirements of Class C.4)Seismic response under rare earthquakes The elastoplastic time history of the structure is analyzed by the MADIS program,considering its obvious nonlinear effects under earthquake action,combined with the characteristics of plastic hinges of different components and the seismic performance of various performance indexes.Make a judgement.It is judged that the structure can meet the performance level of "big earthquake does not fall".5)Because the structure adopts advanced energy dissipation damper device,the results show that the structure adopts energy dissipation damper device with good mechanical properties and economy.It has certain reference significance for the design and calculation of the over-limit high-rise buildings.