Seismic Design and Performance Evaluation of Long-Span Special Truss Moment Frames
Publication: Journal of Structural Engineering
Volume 145, Issue 7
Abstract
The need for a very-long-span structure in sporting and industrial venues puts steel moment frames and braced frames at a disadvantage. In this regard, special truss moment frames (STMFs) can accommodate a large span by utilizing truss girders to provide high lateral stiffness. However, current seismic provisions for structural steel buildings do not allow STMFs’ span and truss depth to exceed 20 and 1.8 m, respectively. Moreover, when a very long span is used, the high axial forces induced by the gravity load could cause considerable ductility reduction of the chord members in the special segment. This paper presents a study on seismic behavior of long-span STMFs with double-channel truss members, a span length of 27.4 m, and a truss depth of 3.05 m. Plastic hinge models of double-channel sections considering the effect of high axial forces were developed based on experimental and nonlinear finite-element analysis (FEA) for both design basis earthquakes (DBEs) and near-collapse earthquakes or maximum considered earthquakes (MCEs). A design procedure for long-span STMFs using nonlinear pushover analysis is presented. The seismic performance of long-span STMFs was verified using the developed plastic hinge models as well as DBE and MCE ground motions through nonlinear time-history (NTH) analyses. According to the FEA results, a modification to the axial load limit in current seismic provisions for the chord members is recommended.
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Acknowledgments
This research was partially supported by the US National Science Foundation under Award No. CMMI-0936563 and the AISC.
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Information
Published In
Journal of Structural Engineering
Volume 145 • Issue 7 • July 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Feb 25, 2018
Accepted: Nov 16, 2018
Published online: Apr 26, 2019
Published in print: Jul 1, 2019
Discussion open until: Sep 26, 2019
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