Improving the seismic performance of post-tensioned self-centering connections using SMA angles or end plates with SMA bolts

Chowdhury, Md. Arman; Rahmzadeh, Ahmad; Alam, M. Shahria

doi:10.1088/1361-665x/ab1ce6

Cited by 39 publications

(12 citation statements)

References 59 publications

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“…The distance between the center of the first bolt row and compression center is defined as h bo . The modified individual equivalent stiffness in the same row can be obtained by equations (15)- (17).…”

Section: Assessment Of Initial Rotational Stiffness By Component Methodsmentioning

confidence: 99%

Experimental and numerical investigation of stiffened angle connection in a minor axis

et al. 2020

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The bolted angle connections which are simple, fast, cost-effective, high quality, and no site welding have been recognized as their excellent performance. The moment-rotation behavior of both major and minor axis should be both taken into considering, however, the lack of research on minor axis limits the more comprehensive application. Five monotonic tests were carried out to investigate the influence under different parameters, and a new type connection were considered and detailed. Refined finite element models were built to validate the experimental results and to do several parametric analyses on initial rotational stiffness and plastic moment resistance, including of a presence of stiffened seat angle, angle thickness, and prying force. Furthermore, a new simplified plate method was proposed for calculating stiffness of stiffened angle and web in bending. The stiffened angle gives a significant increase at the moment-resisting capacity and the initial stiffness, the ultimate rotation of all tested specimens was beyond 0.067rad. The initial stiffness and plastic moment resistance of the joints were also controlled by the column web. The presence of the stiffener in the compression zone has the none effect on initial stiffness. The numerical analysis has captured the failure reason for weld and more attention should be paid to welding of stiffener in engineering design and practice. Adding stiffener at the top-and-seat angle joint can reduce the prying force of bolt, but it still cannot be ignored. The theoretical results were in good agreement with the experimental data and finite element results; therefore, it can be used to guide the design and selection of joints.

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Section: Assessment Of Initial Rotational Stiffness By Component Methodsmentioning

confidence: 99%

Experimental and numerical investigation of stiffened angle connection in a minor axis

et al. 2020

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“…To prevent significant plastic deformations from occurring in ED members, the SMA angles were proposed and applied to self-centering connections by Chowdhury et al [47]. e test results showed that the SMA (FeNCATB alloy) angles could reduce residual displacement of ED elements in which the recover strain could reach 13.5%.…”

Section: Connections Using Shape Memory Alloy (Sma)mentioning

confidence: 99%

“…e SMA bolts with a superelastic property can provide moderate ED capacity for the connections [52]. e selfcentering connections using SMA bolts were tested by Chowdhury et al [47], Wang et al [53], and Fang et al [54,55] through experimental and numerical investigations. It was found that load capacity, initial stiffness, and ED Advances in Civil Engineering capacity were significantly related to the diameter, prestressed force, and length of SMA bolt.…”

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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“…Performance of steel braced frame reinforced with shape memory alloy wires was investigated by Varughese [50]. Chowdhury et al [51] present a new system for improving the seismic performance of post-tensioned self-centering connections using SMA angles or end plates with SMA bolts. Hosseini et al [52] conduct a comparative analysis between the structural performance and cost of using Fe-SMA vs. CFRP reinforcements for the post-tensioned strengthening of existing civil structures.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Response of the Post-Tensioned Tapered Steel Beams with Shape Memory Alloy Tendons

Hosseinnejad

Yaghin

Hosseinzadeh

et al. 2021

IJE

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The external post-tension technique is one of the best strengthening methods for reinforcement and improvement of the various steel structures and substructure components such as beams. In the present work, the load carrying capacity of the post-tensioned tapered steel beams with external shape memory alloy (SMA) tendons were studied. 3D nonlinear finite element method with ABAQUS software is used to determine the effects of the increase in the flexural strength, and the improvement of the load carrying capacity. The effect of the different parameters, such as geometrical characteristics and the post-tension force applied to the tendons were also studied in this research. The results revealed that the external posttension with SMA tendons in comparison with the steel tendons caused a significant improvement of the loading capacity. According to this, using SMA tendon for the reinforcement of the tapered beams resulted in a decrease in weight of these structures and as a consequence responded economic benefits in their application. This method can be used extensively for steel beams due to low executive costs and simplicity of the operation for post-tension.

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Improving the seismic performance of post-tensioned self-centering connections using SMA angles or end plates with SMA bolts

Cited by 39 publications

References 59 publications

Experimental and numerical investigation of stiffened angle connection in a minor axis

Experimental and numerical investigation of stiffened angle connection in a minor axis

Self‐Centering Steel Frame Systems for Seismic‐Resistant Structures

Numerical Investigation of Response of the Post-Tensioned Tapered Steel Beams with Shape Memory Alloy Tendons

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