Self-centering eccentrically braced frames using shape memory alloy bolts and post-tensioned tendons

Xu, Xiaomei; Zhang, Yunfeng; Luo, Yaozhi

doi:10.1016/j.jcsr.2016.06.017

Cited by 57 publications

(26 citation statements)

References 26 publications

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“…Note that a few stress-strain models for SMA rods have been proposed and used in the previous numerical studies on SMA-based self-centering systems [11,14,21,22]. But, there are two debatable details as follows in those previous models:…”

Section: Simpli Ed Materials Modelmentioning

confidence: 99%

“…As a result, di erent simpli ed models might be derived from the same test data. Advances in Civil Engineering the link, the outer 300 mm anges are thickened to 27 mm to sti en the end corners of the link; otherwise, there will be plastic deformation intensively developed in the ange and web around the link end corner which acts as the pivot during the gap opening [21]. Young's modulus of 206 GPa and a yield strength of 345 MPa are assumed for steel material.…”

Section: Simpli Ed Materials Modelmentioning

confidence: 99%

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Tests on Pretrained Superelastic NiTi Shape Memory Alloy Rods: Towards Application in Self‐Centering Link Beams

Cheng

Zheng

2018

Advances in Civil Engineering

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Austenitic shape memory alloy has potential applications in self-centering seismic resistant structural systems due to its superelastic response under cyclic tension. Raw austenitic SMA needs proper pretreatments and pretraining to gain a stable superelastic property. In this paper, tests are carried out to investigate the effects of pretraining, pretreatments, loading rate, and strain amplitude on the mechanical performance on austenitic SMA rods with a given size. The tested rods are to be used in a new concept self-centering steel link beam. Customized pretraining scheme and heat treatment are determined through the tests. The effects of loading rate and strain amplitude are investigated. A simplified stress-strain model for the SMA rods oriented to numerical simulations is obtained based on the test results. An example of using the simplified material model in numerical analysis of a self-centering steel link beam is conducted to validate the applicability of the model.

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Section: Simpli Ed Materials Modelmentioning

confidence: 99%

Section: Simpli Ed Materials Modelmentioning

confidence: 99%

Tests on Pretrained Superelastic NiTi Shape Memory Alloy Rods: Towards Application in Self‐Centering Link Beams

Cheng

Zheng

2018

Advances in Civil Engineering

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“…A one story-one bay inverted V-braced eccentrically braced frame (EBF), which is based on the selfcentering EBF using PT tendons tested by Cheng et al (2012) and later used as an example for EBF using Type I links equipped with SMA bolts and PT tendons (Xu et al, 2016a), is taken as an application here. The dimensions of the EBF system are shown in Figure 12, which are the same as those used by the Xu et al (2016a), except that the PT tendons are removed and the link is connected to the collector beams using composite tendons. The stress-strain relationship of the SMA material gives s Ms = 380 MPa, s Mf = 490 MPa, s As = 220 MPa, s Af = 120 MPa, E A = 50 GPa, E M = 50 GPa, and e L = 0.05.…”

Section: Examplementioning

confidence: 99%

“…It is clearly shown that the EBF using composite tendons consumes considerably less SMA material than the EBF using SMA tendons to achieve the same ultimate story drift ratio. The SMA material used in this example is only about 45% of that used by Xu et al (2016a).…”

Section: Examplementioning

confidence: 99%

Self-centering links using post-tensioned composite tendons

Zheng

Luo

2017

Advances in Structural Engineering

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A new concept of self-centering links using post-tensioned composite tendons consisting of shape memory alloy rods and steel rods is proposed. This new concept is applicable to both short and long links and is able to fully exploit the hysteresis capacity of the used shape memory alloy material. A general scheme for preliminary design of the proposed self-centering links is developed. A typical example is used to verify the proposed concept and its design scheme. A comparison between the example using composite tendons and the previously reported example using pure shape memory alloy tendons is carried out. It is found that the system using composite tendons needs less than half of the shape memory alloy material needed by the system using pure shape memory alloy tendons to possess comparable hysteresis properties meeting the given design demands. The new concept of self-centering links is applied to a typical eccentrically braced frame system to validate its feasibility and advantages in structural systems.

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“…This process is translated into the ability of the material to dissipate energy . Due to their high inherent damping, repeatable re‐centering capabilities and relatively high strength properties, SMAs have been progressively introduced in new technological applications related with energy dissipation in civil engineering structures . ) The proposed connection is conceived to exhibit a significant and stable hysteresis without any damage to the base plate, guaranteeing an adequate transmission of the seismic forces to the foundations.…”

Section: Introductionmentioning

confidence: 99%

Dynamic performance of a superelastic column-base connection

Santos

Leitão

2018

Struct Control Health Monit

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The present paper provides an innovative insight into the design of column-base connections, for steel moment resisting frames, with superelastic shape-memory alloy cables. The proposed strategy is to prevent damage in these connections due to the rotation demands associated with seismic events, by using lateral restraining cables working in phase opposition. A simplified experimental prototype of the proposed connection is tested, under several loading scenarios, proving to be a versatile solution in terms of rotational stiffness, with significant energy dissipating features and re-centering capabilities. A series of numerical simulations are also performed, providing a clear evidence of the good seismic performance of the proposed superelastic connection in real-scale civil engineering structures.

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Self-centering eccentrically braced frames using shape memory alloy bolts and post-tensioned tendons

Cited by 57 publications

References 26 publications

Tests on Pretrained Superelastic NiTi Shape Memory Alloy Rods: Towards Application in Self‐Centering Link Beams

Tests on Pretrained Superelastic NiTi Shape Memory Alloy Rods: Towards Application in Self‐Centering Link Beams

Self-centering links using post-tensioned composite tendons

Dynamic performance of a superelastic column-base connection

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