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Steel and Composite Structures Volume 41, Number 3, November10 2021 , pages 403-416 DOI: https://doi.org/10.12989/scs.2021.41.3.403 |
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Improving seismic performance of eight-bolt extended end plate moment connection |
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Shahriar Quayyum and Timothy R. Kohany
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| Abstract | ||
| The eight-bolt stiffened extended end plate (8ES) connection is one of the connections prequalified for use in special and intermediate moment frames in ANSI/AISC 358. Simulated seismic testing of 8ES connections has generally shown sound performance with ductile failure modes. However, fast fracture of the beam flange at the stiffener toe has been observed in a recent study and was attributed to the high stress concentration in this region. To address this problem, an unstiffened eight-bolt extended end plate connection in which the stress concentration is eliminated by removing the stiffener, and the bolts are rearranged into an octagonal pattern to ensure uniform distribution of bolt forces, has been recently proposed. The study herein performed detailed finite element analyses with octagonal bolt arrangement to demonstrate that despite the improvements, high strain demands at the beam flange to end plate CJP welds may develop when the proposed unstiffened connection is used in conjunction with deep wide flange beam sections (e.g., W-sections of 900 mm nominal depth). Hence, an extended shear tab is used and analytically evaluated for unreinforced eight-bolt extended end plate connections. The extended heavy shear tab relocates the plastic hinge away from flange weld and slightly delays the onset of strength degradation. Systematic analysis results are developed and presented to demonstrate the enhanced seismic performance of the modified EEP connections and to plan future experimentations and design development. | ||
| Key Words | ||
| extended end plate connection; extended end plate stiffener; extended shear tab; octagonal bolt arrangement; seismic performance enhancement | ||
| Address | ||
| Shahriar Quayyumand Timothy R. Kohany: Department of Civil & Environmental Engineering, Manhattan College, Riverdale, NY 10471, USA | ||