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Steel and Composite Structures
  Volume 25, Number 1, September20 2017 , pages 1-17

Seismic performance of mid-rise steel frames with semi-rigid connections having different moment capacity
Mohammad Bayat and Seyed Mehdi Zahrai

    Seismic performance of hybrid steel frames defined as mixture of rigid and semi-rigid connections is investigated in this paper. Three frames with 10, 15 and 20 stories are designed with fully rigid connections and then with 4 patterns for semirigid connection placement, some of beam to column rigid connections would turn to semi-rigid. Each semi-rigid connection is considered with 4 different moment capacities and all rigid and semi-rigid frames consisting of 51 models are subjected to 5 selected earthquake records for nonlinear analysis. Maximum story drifts, roof acceleration and base shear are extracted for those 5 earthquake records and average values are obtained for each case. Based on numerical results for the proposed hybrid frames, story drifts remain in allowable range and the reductions in the maximum roof acceleration of 22, 29 and 25% and maximum base shear of 33, 31 and 54% occur in those 10, 15 and 20-story frames, respectively.
Key Words
    semi-rigid connection; hybrid steel frame; seismic performance; moment capacity ratio
(1) Mohammad Bayat:
School of Civil Engineering, the University of Tehran, Iran;
(2) Seyed Mehdi Zahrai:
Center of Excellence for Engineering and Management of Civil Infrastructures, School of Civil Engineering, The University of Tehran, P.O. Box 11155-4563, Tehran, Iran.

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