Self-centring hybrid-steel-frames employing energy dissipation sequences: Insights and inelastic seismic demand model

Zhang, Huanyang; Zhou, Xuhong; Ke, Ke; Yam, Michael C.H.; He, Xiuzhang; Li, Hong

doi:10.1016/j.jobe.2022.105451

Cited by 23 publications

(4 citation statements)

References 75 publications

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“…Although the experimental work can provide valuable insights into the behavior of CFST connections, it has limitations in capturing the complete evolution of the component' response and the load carrying mechanism. To overcome these limitations, researchers often turn to finite element (FE) analysis techniques [23][24][25], which offer a more comprehensive understanding of the connection's behavior. In this particular study, nonlinear FE analysis was employed to further investigate the force transfer mechanism of the connections tested.…”

Section: Numerical Modeling and Validationmentioning

confidence: 99%

Force Transfer Mechanism and Behavior Insights for a Large-Diameter CFST Column to Steel Beam Connection

Wang,

Yin,

et al. 2023

Buildings

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Concrete-filled steel tube (CFST) columns with internal ring-plate-reinforced connections are increasingly used in high-rise buildings. However, the behavior and optimal design of such large-scale connections is not well established. This study presents a numerical investigation of the structural performance of a ring-plate-reinforced CFST column to steel beam connection. The paper begins by reviewing a previous experimental study. Subsequently, nonlinear finite element models were developed and validated using the test results. Parametric analyses were conducted to evaluate the effects of the ring plate dimensions, friction coefficient, and concrete defects on the load transfer mechanism. The results showed that the ring plate and friction force together effectively transferred the beam load to the concrete core. An optimal ring plate width of 75 mm was identified. Concrete defects significantly reduced the load carrying capacity of the ring plate. The stress distribution in the concrete cross section transitioned from nonuniform to uniform over a length approximately equal to the column diameter. The connection design was found adequate for the prototype structure analyzed. The study provides valuable guidance for improving ring-plate-reinforced connection design in future construction.

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Section: Numerical Modeling and Validationmentioning

confidence: 99%

Force Transfer Mechanism and Behavior Insights for a Large-Diameter CFST Column to Steel Beam Connection

Wang,

Yin,

et al. 2023

Buildings

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“…As a second limitation, the study only considered two design scenarios, represented by two design spectra. From the point of view of earthquake engineering, it is evident that the structural dynamic response is significantly influenced also by the dynamic characteristics of the earthquake [64,65]. Therefore, the results of the study need to be confirmed by further analyses considering different sites characterized by diverse topographies and soil conditions to generate a wider set of seismic scenarios.…”

mentioning

confidence: 94%

Assessment of Non-Linear Analyses of RC Buildings Retrofitted with Hysteretic Dampers According to the Italian Building Code

Bruschi,

Quaglini

2024

Applied Sciences

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While the use of steel hysteretic dampers has spread in the last decade for both new and retrofitted constructions, the Italian Building Code (IBC), as well as the Eurocode 8, does not provide specific recommendations for the design and verification of structures equipped with this technology. Due to their strong non-linear behavior, the effectiveness of the design with these systems must be verified through non-linear analyses. Non-Linear Time-History analyses (NLTHAs) are the most reliable method, but they are computationally expensive. The aim of the study is to investigate the reliability of non-linear static procedures, allowed by the IBC as an alternative to NLTHAs, for the analysis of buildings equipped with hysteretic devices provided with high damping capability. A parametric study is conducted on two reinforced concrete residential buildings, typical of the Italian residential heritage, retrofitted with hysteretic braces characterized by different stiffness and ductility values. The retrofit design is verified using non-linear analyses, both static and dynamic, considering either natural or artificial accelerograms, as the IBC deems them as equivalent. Within this work, reference is made only to the IBC; however, given the significant similarity between the IBC and the European code, the outcomes are expected to have a broader impact and to be not limited to the Italian context. Therefore, although this work is a preliminary study, it is believed to offer some initial insights on the topic and serve as the foundation for a more in-depth study that could lead to a regulatory revision on the subject.

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“…With a growing recognition of the concept of structural seismic resilience against strong earthquakes, 1–5 shape memory alloys (SMAs) have been widely considered as a promising way to reduce the need for post‐earthquake structural repair/demolition and hence reduced economic losses 3,6 . SMAs possess two well‐known characteristics, that is, shape memory effect (SME) and superelasticity (SE), 7–9 in which SE has attracted more considerable attention for seismic applications due to the spontaneous reversible deformation characteristics.…”

Section: Introductionmentioning

confidence: 99%

Risk‐targeted seismic design for collapse safety of SMA‐based structures considering temperature effect

Chen

Wang

Fang

2023

Earthq Engng Struct Dyn

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A risk‐targeted seismic design method for shape memory alloy (SMA)‐based structures is proposed in this study, taking account of temperature effect and the uncertainty of regional temperature distribution. To facilitate discussion of the overall performance of SMA‐based structures, the thermo‐mechanical behaviors of both SMA material and SMA‐based self‐centering braces (SMA‐SCB) are first introduced, where an advanced simulation method is developed. Aided by an extensive parametric study, the collapse capacity of SMA‐based structural systems is comprehensively investigated, where the predominant factors controlling the seismic performance are revealed. Based on the results, the concepts of collapse capacity‐temperature function and temperature‐modified collapse capacity are introduced in this study. The temperature‐modified collapse capacity combines the information of regional temperature distribution and temperature‐dependent behavior of the SMA‐based structures. The temperature‐modified collapse capacity is developed to determine the risk‐targeted design spectral acceleration for satisfying the specific risk‐targeted performance objective. The procedure of the proposed design method is then demonstrated by examining a three‐story SMA‐based self‐centering braced frame (SMA‐SCBF) building in a selected seismic‐active region, followed by a probabilistic method to evaluate the collapse risk. The results manifest that by using the proposed design method, the SMA‐based structures can successfully achieve acceptable performance during the design service life, and the influence of temperature should be carefully taken into consideration in both assessment and design phases.

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Self-centring hybrid-steel-frames employing energy dissipation sequences: Insights and inelastic seismic demand model

Cited by 23 publications

References 75 publications

Force Transfer Mechanism and Behavior Insights for a Large-Diameter CFST Column to Steel Beam Connection

Force Transfer Mechanism and Behavior Insights for a Large-Diameter CFST Column to Steel Beam Connection

Assessment of Non-Linear Analyses of RC Buildings Retrofitted with Hysteretic Dampers According to the Italian Building Code

Risk‐targeted seismic design for collapse safety of SMA‐based structures considering temperature effect

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