Recommendations for numerical modelling of concentrically braced steel frames with gusset plate connections subjected to earthquake ground motion

Ryan, T.L.; Broderick, Brian; Hunt, Alan; Goggins, Jamie; Salawdeh, Suhaib

doi:10.1080/24705314.2017.1354154

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…The modelling approach used here has been previously verified using the results of real-time fullscale shake table testing of single-storey CBFs carried out as part of the BRACED project [6]. Results from the experimental and numerical models were compared under the key criteria of frame acceleration, lateral drift and brace axial force [7]. The test frame set-up and sample comparison of the model and experimental responses are shown in Fig.…”

Section: Numerical Modelmentioning

confidence: 99%

11.44: An integrated experimental and numerical assessment of force‐based design for concentrically braced steel frames

et al. 2017

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This study uses an integrated experimental and numerical approach to assess the use of the forcebased design (FBD) methodology presented in Eurocode 8 (EC8) for multi-storey steel concentrically-braced frames (CBFs). In the EC8 approach, the design seismic action is defined by first generating an elastic response spectrum. This spectrum is reduced to create the design spectrum by applying an appropriate behavioural factor (q) to account for energy dissipation. The value of q chosen depends on the form of the lateral-load resisting structure, the structural material(s) to be used, the ductility class and the degree of irregularity in the structural layout. The design base shear force calculated from the design spectrum is used to estimate the seismic forces on the structure and hence determine the final member cross-section sizes. In this study, the FBD approach to the design of structures presented in Eurocode 8 is described and applied to 4-and 8-storey CBF structures. Both dissipative (Ductility Class High -DCH) and nondissipative (Ductility Class Low -DCL) design is considered for each structure. A numerical modelling approach developed using the OpenSees seismic analysis software and validated from a series of full-scale experimental tests of single-storey CBFs is outlined. The twodimensional reference model assigns appropriate out-of-plane rotational stiffnesses to the ends of the bracing members based on the strength and geometry of gusset plates specified. The experimental work used to validate the model, carried out as part of the BRACED transnational research project funded by the European Commission's Seventh Framework Programme (FP7) is briefly described. The experimental observations support model validation at different levels of earthquake ground motion including elastic, inelastic and ultimate response conditions. The validated numerical modelling approach is used to perform a series of non-linear time history analyses (NLTHA) of the designed 4-and 8-storey frames by subjecting them to appropriately scaled simulated ground motion accelerations. The key recorded responses of the NLTHA of the modelled frames (displacements, drift, brace forces and ductility demands) are compared, and the implications of the assumed energy dissipations are discussed.

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Section: Numerical Modelmentioning

confidence: 99%

11.44: An integrated experimental and numerical assessment of force‐based design for concentrically braced steel frames

et al. 2017

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“…In this study, we present a control method using diagonal-bracing friction damper system for NREL 5-MW OWT (Jonkman, Butterfield, Musial, & Scott, 2009). For earthquake analyses, OpenSees has been proved as one of the most effective software (Mazzoni, McKenna, Scott, & Fenves, 2007, Tran, Nguyen, & Kim, 2018Ryan, Broderick, Hunt, Goggins, & Salawdeh, 2017). For that reason, in this study, OpenSees is used to simulate two steel structures of the wind turbine as steel structures without and with friction dampers.…”

Section: Introductionmentioning

confidence: 99%

Vibration control of jacket offshore wind turbine subjected to earthquake excitations by using friction damper

Nguyen

Chang

et al. 2019

Journal of Structural Integrity and Maintenance

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Recently, a large amount of massive and large wind turbines have been constructed, and many of them are located in areas prone to seismic activity. These structures are generally vulnerable to lateral loads, such as wind loads, wave loads, and especially seismic loads. With the purpose of reducing the seismic damage, a damper system is utilized to control the vibration of NREL 5-MW offshore wind turbine (OWT) with jacket support structure combined with a diagonal bracing friction damper system. Seismic performances of the wind tower structure are studied for two cases: the structures without and with friction dampers. The structural responses to three earthquake records including Cape Mendocino, Duzce and Imperial Valley earthquakes are evaluated by nonlinear dynamic analyses using OpenSees program. Numerical results showed that the proposed vibration control method is effective in reducing the seismic responses of the wind turbines.

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“…A major portion of these studies has focused mainly on the response of bracing members and their connections [3][4]. Extensive experimental [5][6][7] and numerical [8,[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] investigations have also been undertaken to study the behavior of single-story and multi-story CBFs under severe loading scenarios, assessing both the system level and component level responses. In the United States, steel CBFs are designed according to the AISC Specification for Structural Steel Buildings [10], hereafter referred to as AISC360, as well as the special seismic design rules of the AISC Seismic Provisions for Structural Steel Buildings [11], which is referred to here as AISC341.…”

Section: Introductionmentioning

confidence: 99%

Comparison Study of CBFs and EBFs Bracing in Steel Structures with Nonlinear Time History Analysis

Khademi

Rezaie

2017

CivileJournal

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Steel concentrically braced frames (CBFs) and Steel eccentricity braced frames (EBFs) are frequently used as efficient lateral load resisting systems to resist earthquake and wind loads. This paper focuses on high seismic applications where the brace members in CBFs and EBFs dissipate energy through repeated cycles of buckling and yielding. The present study evaluates in detail the design philosophies and provisions used in the United States for these systems. The results of a total of 176 analysis of nonlinear history of seismic behavior of CBFs and EBFs braces have been presented. Notable differences are observed between the performances of the CBFs and EBFs designed using American provisions. The similarities and differences are thoroughly discussed.

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Recommendations for numerical modelling of concentrically braced steel frames with gusset plate connections subjected to earthquake ground motion

Cited by 7 publications

References 11 publications

11.44: An integrated experimental and numerical assessment of force‐based design for concentrically braced steel frames

11.44: An integrated experimental and numerical assessment of force‐based design for concentrically braced steel frames

Vibration control of jacket offshore wind turbine subjected to earthquake excitations by using friction damper

Comparison Study of CBFs and EBFs Bracing in Steel Structures with Nonlinear Time History Analysis

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