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Effect of Connections Semirigidity on Seismic Behavior of Steel Frames

The influence of connection strength and rigidity on the seismic performance of steel moment resisting frames is investigated. The seismic response of frames with three, eight and fifteen story is evaluated. These frames with rigid and semirigid connections were subjected to five earthquake records. In ultimate limit state, the response of rigid and semirigid frames is compared in terms of the base shear, story drift ratio, failure mechanism and behavior factor. These studies indicate that, the semirigidity of steel frames does not necessarily result in larger drift or in more damage than in rigid frames. It was also observed that, a well-proportioned semirigid connection could participate in the nonlinear behavior of the structure and enhances the dynamic performance of steel frames.