Sensitivity of Special Steel Moment Frames to the Influence of Column-Base Hysteretic Behavior Including Gravity Framing System

Torres‐Rodas, Pablo; Flores, Francisco; Astudillo, Bryam; Pozo, Sebastian

doi:10.47964/1120.9298.19279

Cited by 5 publications

(9 citation statements)

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“…Thus, this investigation's scientific basis consists of a series of Nonlinear Time History (NTH) simulations conducted on the mathematical models developed herein. These archetype frames are part of the study by NIST [26], have been adopted in several studies about SMFs' behavior (e.g., [27][28][29]), and their salient features are described next.…”

Section: Methodology Of the Papermentioning

confidence: 99%

“…Concentrated plasticity models have been adopted for this investigation since this approach has been broadly used for studies on SMFs (e.g., [27,28,29,32,33]). Thus, beams and columns are idealized as linear-elastic elements with rotational springs (hinges) at their ends.…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…Thus, a reduced bending strength is calculated with the interactive equations from AISC [37] under the presence of an average gravity load (i.e., 1.05 PD+0.5PL). This approach has been adopted in other studies related to the assessment of SMFs behavior (e.g., [27,28,29,32,33]) mainly because SMFs are drift-controlled rather than forcecontrolled, and consequently, the columns are lightly loaded. Moreover, studies such as [38] show good agreement between experimental results and this approach.…”

Section: Mathematical Modelsmentioning

confidence: 99%

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Influence of Earthquake Mechanisms to the Seismic Response of Steel Moment Frames

Campos¹,

Torres‐Rodas²,

Quinde³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Recent studies conducted on Steel Moment Frames (SMFs) highlight the importance of considering the effect of certain characteristics of earthquake ground motions (GMs) such as duration and spectral shape in their seismic response. Although their acceleration response spectra have mainly characterized ground motions in seismic standards, these studies indicate that the probability of collapse is sensitive to the GMs' duration. This represents a concern in areas with a different tectonic mechanism, such as South-America, and Pacific Northwest U.S., where subduction processes mainly generate GMs. It is well-known that the duration and spectral shape of subductions earthquakes are quite different from crustal earthquakes. Motivated by these issues, this research presents a parametric study to assess building height sensitivity to metrics such as inter-story drift ratios and floor accelerations, considering GMs records from subduction and crustal earthquakes carefully selected and scaled. The scientific basis of this research is a series of nonlinear dynamic analyses conducted on SMFs (varying in height) at different seismic hazard levels. Two hazard levels are considered in this study: a) Life safety and b) Collapse prevention. The paper intends to understand the sensitivity of engineering demand parameters (i.e., drifts and floor accelerations) of SMFs to different earthquake mechanisms (i.e., crustal earthquakes vs. subduction earthquakes). The GMs records of subduction earthquakes consist of a set of GMs representative of South America and Japan's seismicity. The GMs records set of crustal earthquakes collects large magnitude-long distance events representative of Southern California.

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Section: Methodology Of the Papermentioning

confidence: 99%

Section: Mathematical Modelsmentioning

confidence: 99%

Section: Mathematical Modelsmentioning

confidence: 99%

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Influence of Earthquake Mechanisms to the Seismic Response of Steel Moment Frames

Campos¹,

Torres‐Rodas²,

Quinde³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Consequently, several researchers have explored the idea of moving from capacity design criteria to a weak base strong column concept. Results from studies such as [15][16][17][18] indicate that reducing the seismic design demands in ductile base connections would lead to similar performance to frames designed with stronger base plates. Moreover, column problems such as axial shortening may be eliminated if plastic strains are concentrated in ductile anchor bolts.…”

Section: Conclusion and Recommendations For Future Workmentioning

confidence: 99%

“…Recent studies on SMFs [13][14][15][16][17][18] have explored the consequences of weakening the strength of CBCs with the intention to leverage their high deformation capacities and desirable hysteretic properties. These studies show that similar performance (assessed in terms of collapse probability at MCE level) can be achieved in the SMF's behavior if CBCs are sized based on the overstrength seismic load combination rather than with the capacity design criteria.…”

Section: Introductionmentioning

confidence: 99%

Advances in Computational and Analytical Models for Column Base Connections

Torres‐Rodas¹

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Column Base Connections (CBCs) are one of the most important components of Steel Moment Frames (SMFs) since these connections transfer the loads (e.g., gravity, wind, or earthquake loads) from the superstructure to the foundation. Because of it, CBCs have been extensively studied over the last decade through large-scale experimental programs and computational models that have led to the development of well-developed design guides such as the Design Guide 1 (DG1). Early analytical models were developed to predict the strength of CBCs, while subsequent studies estimated their rotational Stiffness, as well as deformation capacity. Modern studies on the topic have been developed to explore their behavior further with sophisticated finite element simulations. Moreover, their high deformation capacity with desirable hysteretic properties has called the researcher's attention to incorporate CBCs as part of the energy dissipation system.The broad research conducted on this area points to the importance of CBCs. Motivated by this issue, this paper summarizes the (state of the art) analytical and numerical models that characterize the behavior of CBCs. First, the different types of CBCs used in the industry are described. Next, the analytical models to predict their strength, rotational Stiffness, and hysteretic properties are summarized. Strategies for the development of finite element models, as well as results from simulations, are detailed. The influence of column base behavior on the global performance of SMFs (varying in height) is described. Finally, the author's essential results from ongoing research on ductile base plates are discussed, and lines for future investigations are recommended.

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Uniaxial Material-Models for Column Base Connections and Their Application in Nonlinear Time History Analyses

Torres‐Rodas

2023

Lecture Notes in Civil Engineering

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Sensitivity of Special Steel Moment Frames to the Influence of Column-Base Hysteretic Behavior Including Gravity Framing System

Cited by 5 publications

References 0 publications

Influence of Earthquake Mechanisms to the Seismic Response of Steel Moment Frames

Influence of Earthquake Mechanisms to the Seismic Response of Steel Moment Frames

Advances in Computational and Analytical Models for Column Base Connections

Uniaxial Material-Models for Column Base Connections and Their Application in Nonlinear Time History Analyses

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