Application Of Pushover Analysis Method In Seismic Design On Erdos Guoxin Plaza

In recent years, building structures are confronted with huge threat due to the frequentoccurrence of earthquake, and the collapse of building structures would lead inestimableloss to human life. The effective methods of reducing loss brought by earthquake andensuring the safety of life and property have caused the high attention of anti-seismicresearchers. With the rapid development of our economy, a large of high-rise buildings areemerging in multitude, and the dynamic characteristics are becoming especiallycomplicated, then it is particularly important which evaluating the seismic behavior ofhigh-rise buildings under different earthquake in advance. At present, the analysis methodof Pushover is widely used in seismic behavior analysis of structures under rarely occurredearthquake, and it has be listed in the seismic design code of our country.The research object of this paper is an engineering case of high-rise frame-shear wallstructure called Guoxin square in Erdos, the main research contents and conclusions are asfollows:The elastic analysis of structure under frequently occurred earthquake is carried withPKPM and MIDAS Gen, the analytic results of two analysis software within5%and everycontrol index is in compliance with the specification requirements, it can satisfy therequirements for fortification of “no damage in frequent earthquake”, the arrangement ofstructure is reasonable.In order to analyzing the structural seismic behavior under rarely occurredearthquake, the Pushover analysis under three kinds of load (constant acceleration, modalload and static load) with capacity spectrum method of MIDAS Gen The results of analysisindicate that, the demand spectrum curve can cross the capacity spectrum curve to formperformance point, the displacement of performance point position in the direction of Xand Y are lower than the limit value of elastic-plastic displacement996mm.The reasonableconsideration of the effects of the high modes, the maximum displacement response is obtained under modal load mode, and the maximum interlayer displacement angle is1/123lower than1/100, it can satisfy the requirements for fortification of “no collapse in rareearthquake”.In order to ensure structural safety and the reliability of Pushover analysis results,dynamic elastic-plastic analysis is conducted on structure, the maximum displacementis740.3mm, meet the requirements of specification, and the results are compared withseveral major indexes by Pushover. The variation tendency of displacement curves arefitted well, and it confirms the safety of this structure under rarely occurred earthquake.According to the distribution of plastic hinge, this structure conform the designprinciple of “strong column and weak beam” and “strong shear and weak bent”, partcomponents loss the bearing capacity and devastate. Thus the weak parts and weakcomponents can be founded and strengthened.