Column axial load effects on the performance of skewed SMF RBS connections

DesRochers, C.G.; Prinz, Gary S.; Richards, P. W.

doi:10.1016/j.jcsr.2018.09.007

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…The numerical investigations demonstrated adequate flexural capacity. Up to a 20° skew angle, increases in column twist and column flange yielding were minimal (Prinz and Richards, 2016;Desrochers et al, 2018). At a 30° skew angle, the torsional demands and yielding effects were more pronounced.…”

Section: Background and Motivationmentioning

confidence: 95%

Steel Structures Research Update: Seismic Performance of Nonorthogonal Special Moment Frame Beam-to-Column Connections

Liu

2021

Eng J

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Ongoing research on the seismic behavior of nonorthogonal special moment frame beam-to-column connections is highlighted. Featured is a comprehensive experimental and computational study under way at the University of Arkansas and led by Dr. Gary Prinz, Associate Professor in Structural Engineering. The research team includes PhD students Hossein Kashefizadeh and Damaso Dominguez. Dr. Prinz’s research interests include mechanics and simulation of ductile fracture, seismic design solutions for steel structures, and computer simulation of structures under dynamic loading. He received a National Science Foundation Faculty Early Career Development (CAREER) award to investigate a new micromechanics-based approach to ductile fracture simulation in additively manufactured steels for improved seismic structural fuse design. Dr. Prinz has also been awarded AISC’s Milek Fellowship. The four-year Milek Fellowship is supporting this research on the seismic performance of skewed special moment frame (SMF) connections. The research team is partway through the third year of the four-year study. Selected results from the computational parametric study are highlighted along with a preview of the experimental investigation.

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Section: Background and Motivationmentioning

confidence: 95%

Steel Structures Research Update: Seismic Performance of Nonorthogonal Special Moment Frame Beam-to-Column Connections

Liu

2021

Eng J

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“…The recent numerical studies investigating bare-steel skewed moment frame connections ( [1], [2]) suggest adequate moment capacity and little deviation in behaviour from orthogonal connection configurations. In [1] and [2], only slight increases in column twist and column flange yielding were observed at skews of up to 20 degrees, with larger torsional and yielding effects noticed at higher skew angles (30 degrees). Commentary in the current AISC provisions for prequalified connections [3] cites the research of [1] in the commentary, stating that "skew angles of less than 5° to 10° might be considered acceptable in reduced beam section connections".…”

Section: Introductionmentioning

confidence: 99%

Cyclic behaviour of laterally skewed special moment frame connections having composite concrete slabs

Dominguez

Prinz

2021

Steel Construction

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This study presents a numerical investigation into the cyclic performance of skewed special moment frame (SMF) connections that include composite concrete slabs. The study uses advanced finite element simulations to investigate the behaviour of shallow (W14×), medium (W24×) and deep (W33×) steel column sections with three levels of beam skew (10, 20 and 30 degrees) for both bare‐steel and composite (steel‐concrete) construction. To account for complex torsional boundary conditions that may affect the skewed connection response, prequalification‐type analyses were conducted considering the middle storey of a three‐storey, two‐way moment frame configuration. In the analyses, all skewed configurations achieved at least 0.04 rad of connection rotation during the cyclic loading protocol prior to a 20 % reduction in moment capacity. When a composite concrete slab was added, column twisting and column flange yielding increased at large skew angles (30 degrees) during positive moment cycles.

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“…Understanding the mechanical performance of AM 17-4 PH steel components in ULCF is needed for the development of optimized energy dissipative components subjected to large repeated strains (such as yielding dampers and structural fuse elements in buildings during seismic loading) [18]. ULCF fracture processes are fundamentally different than those in the HCF regime as they form through a process of micro-void growth and coalescence during material yielding [19][20][21][22][23]. Komotori et al [21] studied the effect of low ductility metal (cast iron) grain size under ULCF, where internal fractures were driven by micro-void coalescence via detachment of the matrix from the interstitial carbon inclusions.…”

Section: Introductionmentioning

confidence: 99%

Ultra Low-Cycle Fatigue Behavior Comparison between Additively Manufactured and Rolled 17-4 PH (AISI 630) Stainless Steels

Gonzalez-Nino

Strasser

Prinz

2021

Metals

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This study investigates the mechanical behavior of additively manufactured (AM) 17-4 PH (AISI 630) stainless steels and compares their behavior to traditionally produced wrought counterparts. The goal of this study is to understand the key parameters influencing AM 17-4 PH steel fatigue life under ULCF conditions and to develop simple predictive models for fatigue-life estimation in AM 17-4 steel components. In this study, both AM and traditionally produced (wrought) material samples are fatigue tested under fully reversed (R = −1) strain controlled (2–4% strain) loading and characterized using micro-hardness, x-ray diffraction, and fractography methods. Results indicate decreased fatigue life for AM specimens as compared to wrought 17-4 PH specimens due to fabrication porosity and un-melted particle defect regions which provide a mechanism for internal fracture initiation. Heat treatment processes performed in this work, to both the AM and wrought specimens, had no observable effect on ULCF behavior. Result comparisons with an existing fatigue prediction model (the Coffin–Manson universal slopes equation) demonstrated consistent over-prediction of fatigue life at applied strain amplitudes greater than 3%, likely due to inherent AM fabrication defects. An alternative empirical ULCF capacity equation is proposed herein to aid future fatigue estimations in AM 17-4 PH stainless steel components.

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Column axial load effects on the performance of skewed SMF RBS connections

Cited by 11 publications

References 12 publications

Steel Structures Research Update: Seismic Performance of Nonorthogonal Special Moment Frame Beam-to-Column Connections

Steel Structures Research Update: Seismic Performance of Nonorthogonal Special Moment Frame Beam-to-Column Connections

Cyclic behaviour of laterally skewed special moment frame connections having composite concrete slabs

Ultra Low-Cycle Fatigue Behavior Comparison between Additively Manufactured and Rolled 17-4 PH (AISI 630) Stainless Steels

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