Behavior and design of top flange-rotated self-centering steel connections equipped with SMA ring spring dampers

Feng, Weikang; Fang, Cheng; Wang, Wei

doi:10.1016/j.jcsr.2019.04.046

Cited by 55 publications

(15 citation statements)

References 28 publications

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“…The studied SCVEB employs SMA cables [ 65 , 66 ] as the core part of the SC system, as shown in Figure 1 b. It is worth mentioning that various types of SMA elements (such as the disc spring [ 67 ], ring spring [ 57 , 68 , 69 , 70 , 71 ], washer spring [ 72 ], etc.) have been developed and are welcomed to be incorporated in this SCVEB system with some necessary modifications on the configuration.…”

Section: Configuration and Working Principle Of Scvebmentioning

confidence: 99%

Self-Centering Shape Memory Alloy-Viscoelastic Hybrid Braces for Seismic Resilience

Zhang

Ping

2022

Materials

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This paper presents a novel type of hybrid self-centering braces incorporating tension-only superelastic NiTi shape memory alloy (SMA) cables and integrated viscoelastic dampers (VEDs). One of our reasons for proposing this new SMA-viscoelastic hybrid brace (SCVEB) is to provide enhanced energy-dissipation ability whilst promoting increased self-centering tendency compared with the existing SMA-based self-centering solutions, where upgrading behavior is mainly benefited from the participation of the VEDs. The configuration and the working principle, along with theoretical equations describing the mechanical behavior of the SCVEB, are described in detail firstly. Experimental verification of individual elements in this SCVEB system, namely the NiTi SMA cables and VEDs, was performed to obtain a basic understanding of their mechanical properties. A proof-of-concept SCVEB specimen was then manufactured, and its cyclic performance was further investigated. Followed by this, a system-level analysis on a series of steel frames equipped with or without SCVEB was conducted. The results showed that the SCVEB system exhibited a moderate damping ratio and a more efficient controlled behavior in terms of its post-event residual deformation and floor acceleration when compared with those of the non-SCVEB system.

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Section: Configuration and Working Principle Of Scvebmentioning

confidence: 99%

Self-Centering Shape Memory Alloy-Viscoelastic Hybrid Braces for Seismic Resilience

Zhang

Ping

2022

Materials

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“…Equipped with an SMA ring spring damper, a new type of asymmetric self-centering connection inspired by Khoo et al [31,32] was presented by Feng et al [51], as shown in Figure 12. e moment resistance and self-centering force are offered by an SMA damper that is fixed on the flanges of column and beam through a pin shaft and a bracket, 8…”

Section: Connections Using Shape Memory Alloy (Sma)mentioning

confidence: 99%

“…e experiment results showed that this connection possessed a favorable ED and self-centering capacity, although slight inclination of the SMA rings occurred during the cyclic loading. ere is an ultimate deformation for these ring spring systems [50,51]. When the drift exceeds the limitation, the stiffness of the connection will increase sharply as shown in Figure 11(c), and the flexible connection transforms into a rigid one on the loading direction.…”

Section: Connections Using Shape Memory Alloy (Sma)mentioning

confidence: 99%

Self‐Centering Steel Frame Systems for Seismic‐Resistant Structures

Zhu

Zhao

2020

Advances in Civil Engineering

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This paper introduces a review of self-centering steel frame systems for seismic-resistant structures. The components and basic mechanisms of the developing posttensioned connections and self-centering braces are briefly introduced. The structural details and seismic behaviors of the self-centering systems proposed in recent years, including connections, energy dissipating braces, and steel frames, are condensed in categories. The theoretical and experimental results indicated that self-centering action could minimize residual deformation and structural damage. The energy dissipating capability of the self-centering systems is greatly enhanced by the application of energy dissipating device. The shape memory alloys (SMAs) and prepressed springs which exhibited great potential in energy dissipation and recentering capability have been studied increasingly in recent years. Abundant numerical models were propounded to investigate the cyclic response of these self-centering systems. The current research challenges and the critical issues which need further study are discussed at the end of this paper.

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“…Utilizing the flag‐shaped hysteretic stress‐strain responses of superelastic SMAs, novel connections, 20–23 dampers, 6,24,25 base isolators, 26 and bracing systems 27,28 have been successfully proposed. Wang et al and Fang et al developed a series of beam‐to‐column connections utilizing SMA bolts 20–22 and ring springs 23,29 . The novel connections exhibit excellent SC capability, ductility, and energy dissipation performance, which are demonstrated via both theoretical and experimental investigation.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic seismic evaluation of SMA‐based self‐centering braced structures considering uncertainty of regional temperature

Chen

Wang

Fang

2021

Earthq Engng Struct Dyn

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Smart materials such as shape memory alloys (SMAs) have unique material properties that can potentially mitigate structural damage against earthquake. However, the mechanical behavior of SMAs is sensitive to temperature variation. The traditional deterministic analysis, which does not take into account the influence of temperature, may lead to inaccurate and sometimes unsafe predictions of actual behavior of SMA‐based structures. This research aims to develop a modified framework based on the performance‐based earthquake engineering methodology, taking account of the uncertainty of regional temperature distribution for temperature‐dependent (TD) structures, where the SMA‐based one is considered as a representative case. As the main part of the methodology, regional seismic fragility is generated by combing temperature distribution properties and joint seismic fragility. The proposed methodology is applied to a six‐story self‐centering concentrically‐braced frame (SC‐CBF) with SMA‐based SC braces located in different regions in China. A simplified thermo‐mechanical model capturing the TD characteristics and possible failure of SMA cables is utilized. Deterministic nonlinear static and dynamic analysis is first conducted to understand the structural response. Then, the joint seismic fragility analysis of the SC‐CBF under different intensity levels of ground motion and temperatures is conducted via the incremental dynamic analysis method, by which the seismic performance of the structure can be fully captured. Finally, the proposed methodology is utilized to comprehensively evaluate the regional seismic fragility and collapse risk of the SC‐CBF in different regions. The results indicate that the ignorance of the temperature effect could underestimate the risk of collapse.

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Behavior and design of top flange-rotated self-centering steel connections equipped with SMA ring spring dampers

Cited by 55 publications

References 28 publications

Self-Centering Shape Memory Alloy-Viscoelastic Hybrid Braces for Seismic Resilience

Self-Centering Shape Memory Alloy-Viscoelastic Hybrid Braces for Seismic Resilience

Self‐Centering Steel Frame Systems for Seismic‐Resistant Structures

Probabilistic seismic evaluation of SMA‐based self‐centering braced structures considering uncertainty of regional temperature

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