Performance enhancement of eight bolt extended end-plate moment connections under simulated seismic loading

Morrison, Machel L.; Quayyum, Shahriar; Hassan, Tasnim

doi:10.1016/j.engstruct.2017.08.040

Cited by 25 publications

(8 citation statements)

References 28 publications

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“…A combined hardening material model for the BRB pipe element together with a separate connector element in parallel are used in the Abaqus model analyses. The hardening parameters for the combined isotropic and kinematic hardening completely follow the values proposed by Morrison et al In addition, a separate axial connector element is parallel‐connected to the BRB pipe element. The connector element adopts elastic compression‐only material model.…”

Section: Numerical Modeling Using a Finite Element Analysis Programmentioning

confidence: 82%

Seismic performance analysis of BRBs and gussets in a full‐scale 2‐story BRB‐RCF specimen

Tsai

Chen

et al. 2018

Earthq Engng Struct Dyn

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Summary The implementation of buckling‐restrained braces (BRBs) for new reinforced concrete frame (RCF) constructions is limited. This study investigates the seismic forces and stability in the BRBs and gussets of a 2‐story full‐scale RCF specimen by using Abaqus models and a newly proposed stability evaluation method. The hybrid and cyclic loading test results are accurately predicted by the Abaqus analyses. Existing methods for computing the gusset interface forces for steel buildings from both the brace and the frame actions are compared with the Abaqus results. The applicability of these methods for the BRB‐RCF design is critically evaluated. It is confirmed that the Parallel‐2 method is suitable for estimating the BRB force demand imposed on the corner gusset and the generalized uniform force method is good for the corner gusset at the base. In addition, existing stability evaluation methods for BRBs and gussets are applied to investigate the out‐of‐plane (OOP) buckling of the first‐story BRB observed at the end of tests. The proposed stability model incorporates the BRB restrainer's flexural effects and 4 rotational springs in assessing the BRB's buckling. This model confirms that the BRB and the gusset's OOP buckling limit states could be coupled and must be evaluated together. By incorporating the flexural effects of the steel casing and the infilled grout, the proposed model satisfactorily predicts the OOP buckling of the first‐story BRB and gussets. These research results can be used for the implementation of BRBs in new RC frame constructions.

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Section: Numerical Modeling Using a Finite Element Analysis Programmentioning

confidence: 82%

Seismic performance analysis of BRBs and gussets in a full‐scale 2‐story BRB‐RCF specimen

Tsai

Chen

et al. 2018

Earthq Engng Struct Dyn

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“…Where and εy are the plastic strain and yield strain, respectively. This method had used to identify the failure of steel components such as shear tab and bolt in simple conventional connections, and in welded connections, beam flange, and web, in other researcher's studies [30][31][32][33][34][35][36].…”

Section: Fracture Mechanismsmentioning

confidence: 99%

Capacity Evaluation of Eight Bolt Extended Endplate Moment Connections Subjected to Column Removal Scenario

2021

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The extended stiffened endplate (8ES) connection is broadly used in the seismic load-resisting parts of steel structures. This connection is prequalified based on the AISC 358 standard, especially for seismic regions. To study this connection’s behaviors, in the event of accidental loss of a column, the finite element model results were verified against the available experimental data. A parametric study using the finite element method was then carried out to investigate these numerical models’ maximum capacity and effective parameters' effect on their maximum capacity in a column loss scenario. This parametric analysis demonstrated that these connections fail at the large displacement due to the catenary action mode at the rib stiffener's vicinity. The carrying capacity, PEEQ, Von-Mises stress, middle column force-displacement, critical bolt axial load, and the beam axial load curves were discussed. Finally, using the Least Square Method (LSM), a formula is presented to determine the displacement at the maximum capacity of these connections. This formula can be used in this study's presented method to determine the maximum load capacity of the 8ES connections in a column loss scenario.

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“…Over the past several years, the EPC literature has been overpopulated with investigations that use finite element methods (FEMs) to predict the behavior of this type of connection [10][11][12][13][14][15][16][17][18][19][20]. Despite this, the limitations found in several documents are similar and therefore universally recognizable.…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation of Prequalified End-Plate Connections Used in a Framed Steel Industrial Structure

Ambiado¹,

Lopez²,

Vielma³

2021

Metals

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The design of end-plate connections for steel structures is more loosely specified in Chilean regulations than in American regulations. Nevertheless, eight-bolt extended stiffened (8ES) end-plate connections have not derived benefit from extensive past research, and therefore, their normative recommendations are quite constraining. In this study, both the prequalification and qualification limits are evaluated, and the linear and nonlinear analyses of a connection from a case study focused on a typical industrial structure, characterized by its reduced dimensions, are carried out. For the design of the connection, a spreadsheet was developed based on AISC 358. The nonlinear analysis was modeled using the finite element method, and it is confirmed that the normative recommendations restrict the design in a very conservative way, resulting in oversizing. Finally, a new optimized connection configuration is proposed and analyzed without stiffeners.

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Performance enhancement of eight bolt extended end-plate moment connections under simulated seismic loading

Cited by 25 publications

References 28 publications

Seismic performance analysis of BRBs and gussets in a full‐scale 2‐story BRB‐RCF specimen

Seismic performance analysis of BRBs and gussets in a full‐scale 2‐story BRB‐RCF specimen

Capacity Evaluation of Eight Bolt Extended Endplate Moment Connections Subjected to Column Removal Scenario

Numerical Evaluation of Prequalified End-Plate Connections Used in a Framed Steel Industrial Structure

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