Seismic Design and Performance Evaluation of Dual-Fused H-Frame System
Publication: Journal of Structural Engineering
Volume 145, Issue 12
Abstract
A dual-fused H-frame (DFHF) is an efficient structural system that combines damped H-frame (DHF) modules with welded wide flange fuses (WWFFs) to create a structural solution that is efficient in construction and more seismically resilient. Each DHF module consists of two columns pin connected to a beam with two buckling restrained knee braces (BRKBs). Each DHF module can be prefabricated at the factory, shipped to the site, and connected vertically using simple bolt connections. The connections between the DHF modules have relatively small moment demand, which makes the design, fabrication, and construction of the DHF modules very efficient. Once the DHF modules are assembled vertically, the bays of the DHF can be connected using WWFFs. WWFFs are simple shear connectors that can stably dissipate earthquake energy. In this paper, two prototype DFHF buildings of varying heights (three and nine stories) are designed using the equivalent energy design procedure (EEDP). The EEDP is a novel design method that was developed to design innovative systems, where the structural system can satisfy different performance objectives under different earthquake shaking intensities. To verify the performance of the DFHF, advanced finite-element models are developed using OpenSees and subjected to an extensive array of time history analyses. The results show that the proposed EEDP designed DFHF can meet the targeted performance objectives under different seismic shaking intensities. In addition, DFHF has a sufficient margin of safety against collapse. Hence, the proposed DFHF can be used as an efficient structural system in high seismic zones.
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Acknowledgments
The authors would like to acknowledge the funding provided by the International Joint Research Laboratory of Earthquake Engineering (ILEE) and National Science Foundation China (Grant No. 51778486), State Key Laboratory of Disaster Reduction in Civil Engineering for theur support the graduate student. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 12 • December 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jul 30, 2018
Accepted: Apr 16, 2019
Published online: Sep 30, 2019
Published in print: Dec 1, 2019
Discussion open until: Feb 29, 2020
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