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Appl. Sci. 2017, 7(5), 449; doi:10.3390/app7050449

Evaluation of a Simplified Method to Estimate the Peak Inter-Story Drift Ratio of Steel Frames with Hysteretic Dampers

1
Earthquake Disaster Mitigation Research Division, National Research Institute for Earth Science and Disaster Resilience, Miki 673-0515, Japan
2
Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8603, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Gangbing Song
Received: 4 March 2017 / Revised: 10 April 2017 / Accepted: 20 April 2017 / Published: 27 April 2017
View Full-Text   |   Download PDF [4155 KB, uploaded 27 April 2017]   |  

Abstract

In this paper, a simplified method is proposed to estimate the peak inter-story drift ratios of steel frames with hysteretic dampers. The simplified method involved the following: (1) the inelastic spectral displacement is estimated using a single-degree-of-freedom (SDOF) system with multi-springs, which is equivalent to a steel frame with dampers and in which multi-springs represent the hysteretic behavior of dampers; (2) the first inelastic mode vector is estimated using a pattern of story drifts obtained from nonlinear static pushover analysis; and (3) the effects of modes higher than the first mode are estimated by using the jth modal period, jth mode vector, and jth modal damping ratio obtained from eigenvalue analysis. The accuracy of the simplified method is estimated using the results of nonlinear time history analysis (NTHA) on a series of three-story, six-story, and twelve-story steel moment resisting frames with steel hysteretic dampers. Based on the results of a comparison of the peak inter-story drift ratios estimated by the simplified method and that computed via NTHA using an elaborate analytical model, the accuracy of the simplified method is sufficient for evaluating seismic demands. View Full-Text
Keywords: simplified estimation method; steel hysteretic damper; peak inter-story drift ratio; inelastic mode vector; equivalent SDOF system simplified estimation method; steel hysteretic damper; peak inter-story drift ratio; inelastic mode vector; equivalent SDOF system
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Kang, J.-D.; Mori, Y. Evaluation of a Simplified Method to Estimate the Peak Inter-Story Drift Ratio of Steel Frames with Hysteretic Dampers. Appl. Sci. 2017, 7, 449.

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