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A platform for research: civil engineering, architecture and urbanism
Experiments and Analysis of Unstiffened Eight-Bolt End-Plate Moment Connections for Seismic Applications
https://orcid.org/0000-0001-6125-538X
https://orcid.org/0000-0002-6896-6499
Bolted extended end-plate (BEEP) moment connections are one of several types of connections prequalified for use in special and intermediate moment frames in the ANSI/AISC 358 standard. The BEEP connections that are prequalified include a stiffened and unstiffened four-bolt configuration and a stiffened eight-bolt configuration. In this study, a recently proposed unstiffened eight-bolt configuration is evaluated through large-scale testing and detailed finite-element (FE) analysis. The connection features a modified bolt arrangement to improve bolt force distribution and eliminates the stress concentration from the end-plate stiffener that has led to brittle beam flange fractures in recent studies. In all tests, the proposed connection attained the ANSI/AISC 341 qualifying 4% story drift requirement and exhibited a ductile failure mode, namely, local buckling in the beam plastic hinge and gradual strength degradation. A detailed FE model of the proposed connection is validated against the experimental data and used to further analyze and optimize the connection through parametric studies. Finally, a design procedure which parallels that in chapter 6 of the ANSI/AISC 358 for existing BEEP connections is proposed. A central aspect of the design procedure is a method to calculate bolt forces, including the effects of prying, in the proposed connection.
Experiments and Analysis of Unstiffened Eight-Bolt End-Plate Moment Connections for Seismic Applications
https://orcid.org/0000-0001-6125-538X
https://orcid.org/0000-0002-6896-6499
Bolted extended end-plate (BEEP) moment connections are one of several types of connections prequalified for use in special and intermediate moment frames in the ANSI/AISC 358 standard. The BEEP connections that are prequalified include a stiffened and unstiffened four-bolt configuration and a stiffened eight-bolt configuration. In this study, a recently proposed unstiffened eight-bolt configuration is evaluated through large-scale testing and detailed finite-element (FE) analysis. The connection features a modified bolt arrangement to improve bolt force distribution and eliminates the stress concentration from the end-plate stiffener that has led to brittle beam flange fractures in recent studies. In all tests, the proposed connection attained the ANSI/AISC 341 qualifying 4% story drift requirement and exhibited a ductile failure mode, namely, local buckling in the beam plastic hinge and gradual strength degradation. A detailed FE model of the proposed connection is validated against the experimental data and used to further analyze and optimize the connection through parametric studies. Finally, a design procedure which parallels that in chapter 6 of the ANSI/AISC 358 for existing BEEP connections is proposed. A central aspect of the design procedure is a method to calculate bolt forces, including the effects of prying, in the proposed connection.
Experiments and Analysis of Unstiffened Eight-Bolt End-Plate Moment Connections for Seismic Applications
https://orcid.org/0000-0001-6125-538X
https://orcid.org/0000-0002-6896-6499
Bolted extended end-plate (BEEP) moment connections are one of several types of connections prequalified for use in special and intermediate moment frames in the ANSI/AISC 358 standard. The BEEP connections that are prequalified include a stiffened and unstiffened four-bolt configuration and a stiffened eight-bolt configuration. In this study, a recently proposed unstiffened eight-bolt configuration is evaluated through large-scale testing and detailed finite-element (FE) analysis. The connection features a modified bolt arrangement to improve bolt force distribution and eliminates the stress concentration from the end-plate stiffener that has led to brittle beam flange fractures in recent studies. In all tests, the proposed connection attained the ANSI/AISC 341 qualifying 4% story drift requirement and exhibited a ductile failure mode, namely, local buckling in the beam plastic hinge and gradual strength degradation. A detailed FE model of the proposed connection is validated against the experimental data and used to further analyze and optimize the connection through parametric studies. Finally, a design procedure which parallels that in chapter 6 of the ANSI/AISC 358 for existing BEEP connections is proposed. A central aspect of the design procedure is a method to calculate bolt forces, including the effects of prying, in the proposed connection.
Experiments and Analysis of Unstiffened Eight-Bolt End-Plate Moment Connections for Seismic Applications
J. Struct. Eng.
Morrison, Machel (author) / Suarez, Sergio (author)
2022-04-01
Article (Journal)
Electronic Resource
English
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