Design for Lateral Loads/Systems

Single Abstract

341591 - Analysis of Seismic Performance of Long-Span Special Truss Moment Frames

Saturday, April 21
10:00 AM - 11:30 AM
Location: 204AB

The need for a very long span structure in sports and industrial venues puts steel moment frames and braced frames in an unfavorable position. In this regard, special truss moment frames (STMFs) can accommodate a large span by utilizing truss girders to provide high lateral stiffness. However, current AISC Seismic Provisions for Structural Steel Buildings (AISC 341-16) do not allow an STMF span and truss depth of more than 65 ft and 6 ft, respectively. These limitations were based on experimental and analytical research in the 1990s. This paper presents an analytical study on the seismic behavior of long-span STMFs with double-channel truss members, a span length of 90 ft, and a truss depth of 10 ft. Seismic performance of long-span STMFs was first evaluated by a series of nonlinear time-history (NTH) analyses under 20 design basis earthquakes (DBEs). The hysteresis behavior of double-channel sections under near-collapse earthquake conditions was studied by an experimental test of a specimen under a proposed near-collapse loading protocol. It was then used as the plastic hinge model for STMF members in NTH analyses under 20 maximum considered earthquakes (MCEs) to further evaluate their seismic performance. In addition, since the top chord members of the long-span truss were subjected to high axial compression under gravity load, the plastic hinge models were modified by considering the high axial compression on ductility using nonlinear finite element analyses. This study introduces a new design procedure for long-span STMFs incorporating conventional elastic design and capacity design based on pushover analysis.

Shih-Ho Chao

The University of Texas at Arlington

Shih-Ho (Simon) Chao, Ph.D., P.E., is a Professor at the University of Texas at Arlington. His research interests include high-performance fiber reinforced concrete, prestressed/precast concrete, and seismic design of structures. He is a member of ASCE, ACI, PCI, AISC, EERI, ASTM, and SEAoT. He was the recipient of the ACI Chester Paul Siess Award for Excellence in Structural Research and AISC Milek Young Researcher Fellowship Award, the Outstanding Civil Engineering Instructor Award at the University of Texas at Arlington, and the 2015 University of Texas System Regents' Outstanding Teaching Award.


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Kyoungsub Park

Post-doc Research Fellow
The University of Texas at Arlington



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John D. Hooper

Senior Principal / Director of Earthquake Engineering
Magnusson Klemencic Associates

John Hooper is a Senior Principal and the Director of Earthquake Engineering at Magnusson Klemencic Associates, a consulting structural and civil engineering firm in Seattle, Washington. He received his Bachelor of Civil Engineering from Seattle University and a Master of Science from the University of California at Berkeley.

John has over 30 years of engineering experience in the fields of renovation, seismic engineering, earthquake engineering, and structural analysis. He is Chair of the American Society of Civil Engineer (ASCE 7’s) Seismic Subcommittee and is a member of the Main Committee, and a member of the Building Seismic Safety Council (BSSC) NEHRP Provisions Update Committee.


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Chatchai Jiansinlapadamrong

Ph.D. Candidate
The University of Texas at Arlington



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341591 - Analysis of Seismic Performance of Long-Span Special Truss Moment Frames

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