An Equivalent Design Method To Improve Seismic Performance of Step-Terrace RC Moment Frames By Viscous Dampers

Abstract eng:
Step-terrace RC moment frame, which foundations are not at same elevation level, is one of typical structures in mountain cities and its seismic behavior is different from conventional regular ones under earthquake action. It is necessary to study on how to improve its seismic performance using viscous dampers because many research works are focused on the conventional regular frames at present. In this paper, an equivalent seismic design method is proposed that the Step-terrace frame is firstly simplified into regular one according to equal stiffness, then the locations and parameters of diagonal viscous dampers are determined by traditional seismic design method. In order to verify this approach’s availability, structural dynamic analyses are conducted for frames with different configurations subjected to different level earthquake excitations. The results show that the proposed method is available. However, its applicable scope is related to total number of floors and spans of step-terrace part. Meanwhile, the dampers setup scheme which damping coefficients are proportional to story shear force is better than equal along building height. It’s also found that structural seismic performance is not significantly influenced whether dampers are set at step-terrace floors of the structure. And the weak part of structures is located at upper embedding floor although viscous dampers are used.

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