Seismic Waves Input for the Time-History Analysis of High-Rise Building

The calculation results are very different if the earthquake input are different when we do the timehistory analysis of high-rise structures,so it is necessary to study seismic wave input to improve the accuracy of the results.The method of the selection of actual seismic waves for time-history analysis of high-rise structures is illustrated by examples.Meanwhile,according to the actual situation of the project,earthquake is regarded as a hypothesis with different frequencies with random phase angle of the trigonometric series of the superposition.And a brief exposition of the generated response spectrum fitting synthesis of artificial seismic wave theory and method is presented.The seismic waves are obtained to meet the requirements of time-history analysis by the methods and programming.Then,the resulting seismic waves are combined into 3 groups cases of time-history analysis by using the ETABS nonlinear finite element program,and the time-history analysis of the Pangu steel frame structure in Beijing is carried out.Two groups of earthquakes with a seismic time for 30 s and a peak ac-celeration of Wenchuan seismic waves for 400 cm/s2 and one group of earthquake with a seismic time for 30 s and the peak acceleration of artificial seismic waves for 400 cm/s2 are obtained by applying the method as described above.Time-history analysis results show that the design of Pangu steel frame structure is more reasonable,and the seismic performance of structure is also good by inputing these 3 groups of seismic waves into the Pangu Plaza steel frame structural.But considering the complexity of the frame structure and irregular structure of the top ,the structure should be installed with some additional dampers between the columns and the top truss to improve the seismic performance.The conclusion is drawn that the method of the selection of seismic waves and synthesis of artificial seismic wave for the time-history analysis of high-level structures is simple and easy to grasp and handle programming.