Abstract
Multi-level Pipe Damper (MPD) recently proposed by the authors is a passive control device to reduce the seismic vibration. In this research, seismic response of steel structures equipped with MPD is studied. To evaluate the effects of the proposed damper, typical 5, 10 and 15-story steel buildings are modeled and their seismic responses under seven earthquake excitations are investigated using dynamic nonlinear time-history analyses by SAP2000 program. Results show the effectiveness of MPD to altering the seismic response of the structures such that maximum displacement reduced by average of 54, 52, and 19% and maximum roof acceleration decreased by average of 16, 14, and 11% compared to those of the bare frames for the 5, 10 and 15-story buildings respectively. Moreover, using MPD decreases the structural and nonstructural damages noticeably by limiting the inter story drifts because of the secondary hardening branch of force-displacement by average of 53, 54, and 11% for the 5, 10 and 15-story buildings respectively proving the effectiveness of the proposed damper as a retrofitting technique for structures at high seismic risk areas.
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