Abstract
The common analysis methods of structural building include the response spectrum, static nonlinear analysis (pushover) and dynamic nonlinear analysis method. Meanwhile, for the analysis of irregular structures, dynamic nonlinear analysis method could accurately simulate the seismic response of structure under rare earthquake. In this paper, the dynamic nonlinear analysis was carried out to evaluate the seismic performance of an office building with irregular in plan and in elevation. The simulation results show that the maximum inter story-drift angle can satisfy the requirement in the nation code. Few shear walls exceeded the concrete yield compressive stress and most of the shear walls remained in the elastic stage. Most frame columns were within the component acceptance criterion of IO. By the above analysis results, it can be judged that the seismic capacity of the building structure can reach the seismic performance objectives in the code.
Highlights
Past earthquake events and the shaking table tests have shown that the irregular structures suffer more serious damage due to the inconsistency of the mass center and the rigidity center[1,2]
It shows that most concrete beams were within the acceptance criterion of LS and two beams exceeded the criterion of CP
This paper evaluated the seismic performance of the irregular building structure in rare earthquake
Summary
Past earthquake events and the shaking table tests have shown that the irregular structures suffer more serious damage due to the inconsistency of the mass center and the rigidity center[1,2]. The maximum torsional displacement ratio was 1.37 and the eccentricity ratio according to the coordinates of mass center and rigidity center in the third floor was 0.87, which were all exceed the requirement in the nation code of GB 50011[3]. The construction areas decreased by 27%, 32% and 40% in the ninth, fourteenth and fifteenth floors, respectively, which was characterized by the elevation irregular buildings. As the building belongs to the irregular building in the plan and elevation, it was required to evaluate the seismic performance under rare earthquake
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