Development and experimental validation of a nickel–titanium shape memory alloy self-centering buckling-restrained brace

Miller, David J.; Fahnestock, Larry A.; Eatherton, Matthew R.

doi:10.1016/j.engstruct.2012.02.037

Cited by 428 publications

(158 citation statements)

References 24 publications

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“…Therefore, aramid fiber strands (which have an elastic strain capacity up to 4% [15]) or shape memory alloys with superelastic behavior up to 6% strain (e.g., [20]) have been used in self-centering braces. Figure 4c shows that the load-deformation response for a 23 mm round SMA rod subjected to cyclic tension (from [17]) exhibits the prerequisite nonlinear elastic behavior without requiring a gap opening mechanism. Double telescoping mechanisms have also been developed to reduce the strain demands on the PT element in self-centering braces (e.g., [21,22]).…”

Section: Restoring Force Mechanism and Gap Openingsmentioning

confidence: 99%

“…This reduction in stiffness is desirable because it lengthens the period of the structure and helps to limit the forces that can develop in the lateral force resisting system (i.e., softening occurs without structural damage). Because the bearing surfaces at the location of gap opening in a real structure are not all perfectly flat and the members are not exactly the same length, the actual load-deformation response may have rounded corners (e.g., [16,17]) rather than the sharp corners illustrated schematically in Figure 4b. The stiffness of the system after gap opening is primarily controlled by the axial stiffness of the PT steel and the location of the PT steel.…”

Section: Restoring Force Mechanism and Gap Openingsmentioning

confidence: 99%

“…Steel moment frames primarily use friction between the beam end and column face to transfer shear, but also have some redundancy for shear transfer supplied by the energy dissipation device, whether a friction damper [25], yielding angles [26], or short yielding bars [27]. Although self-centering braces are subjected primarily to axial forces, it is still necessary to restrain lateral motion of the concentric tubes using spacers or guides [15,17].…”

Section: Restoring Force Mechanism and Gap Openingsmentioning

confidence: 99%

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Self-Centering Seismic Lateral Force Resisting Systems: High Performance Structures for the City of Tomorrow

et al. 2014

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Abstract:Structures designed in accordance with even the most modern buildings codes are expected to sustain damage during a severe earthquake; however; these structures are expected to protect the lives of the occupants. Damage to the structure can require expensive repairs; significant business downtime; and in some cases building demolition. If damage occurs to many structures within a city or region; the regional and national economy may be severely disrupted. To address these shortcomings with current seismic lateral force resisting systems and to work towards more resilient; sustainable cities; a new class of seismic lateral force resisting systems that sustains little or no damage under severe earthquakes has been developed. These new seismic lateral force resisting systems reduce or prevent structural damage to nonreplaceable structural elements by softening the structural response elastically through gap opening mechanisms. To dissipate seismic energy; friction elements or replaceable yielding energy dissipation elements are also included. Post-tensioning is often used as a part of these systems to return the structure to a plumb; upright position (self-center) after the earthquake has passed. This paper summarizes the state-of-the art for self-centering seismic lateral force resisting systems and outlines current research challenges for these systems. OPEN ACCESSBuildings 2014, 4 521

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Section: Restoring Force Mechanism and Gap Openingsmentioning

confidence: 99%

Section: Restoring Force Mechanism and Gap Openingsmentioning

confidence: 99%

Section: Restoring Force Mechanism and Gap Openingsmentioning

confidence: 99%

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Self-Centering Seismic Lateral Force Resisting Systems: High Performance Structures for the City of Tomorrow

et al. 2014

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“…The braces consist of structural elements interconnected by a friction energydissipative mechanism and equipped with pre-tensioned fibre tendons that provide restoring forces. Miller et al [31] proposed a self-centering BRBF using a typical BRB component and super elastic nickel-titanium shape memory alloy rods. Simpler approaches to mitigate residual drifts have been studied in [32].…”

Section: And Uangmentioning

confidence: 99%

Dual seismic-resistant steel frame with high post-yield stiffness energy-dissipative braces for residual drift reduction

Baiguera

Vasdravellis

Karavasilis

2016

Journal of Constructional Steel Research

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Keywords: Dual seismic-resistant steel frame; low-damage steel frame; residual drift mitigation; energy-dissipative brace; replaceable fuse; nonlinear finite element analysis. Abstract.A dual seismic-resistant steel frame, which consists of a moment-resisting frame equipped with high post-yield stiffness energy-dissipative braces, is proposed and numerically evaluated. Replaceable hourglass shape pins made of duplex stainless steel with high postyield stiffness and large energy dissipation and fracture capacity are in series connected to conventional steel braces. Moreover, replaceable fuses are introduced in the beams at the locations where plastic hinges are expected to develop. A performance-based seismic design procedure and appropriate capacity design rules are used to design the dual frame, while its seismic performance is evaluated with advanced numerical simulations using experimentally validated shell-solid finite element models and simplified beam element models. The numerical results show that the dual frame has adequate stiffness and energy dissipation capacity to control peak storey drifts (i.e. non-structural damage), while plastic deformations (i.e. structural damage) are isolated within the replaceable pins of the braces and the beam fuses. In addition, the high post-yield stiffness of the pins, combined with the appreciable elastic deformation capacity of the moment-resisting frame, results in significant reduction of residual storey drifts, which are found to have a mean value of 0.06% under the design earthquake and a mean value of 0.12% under the maximum considered earthquake. These values indicate a superior residual storey drift performance compared to steel frames equipped with buckling restrained braces, and highlight the potential of the proposed dual frame to help steel buildings to return to service within an acceptable short time in the aftermath of a strong earthquake.2

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“…erefore, for the purpose of protecting such main members, the damper devices installed on the bracing member are designed to concentrate the displacement and load and have been used as consumable products that can be easily replaced when damaged [7][8][9]. Although the conventional bracing damper system has an excellent ability not only to absorb the external impact but also to diminish the structural vibration, it has the disadvantage of requiring additional maintenance due to the residual deformation caused by the lack of recentering capability [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Behavior of Bracing Damper Systems by Utilizing Metallic Yielding and Recentering Material Devices

Noh

Ahn

2018

Advances in Materials Science and Engineering

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With the aim of effectively reducing the structural damage caused by earthquake events, bracing systems equipped with retrofitting damper devices, which take advantage of the energy dissipation and impact absorption, have been widely used in practical construction sites. ese bracing dampers, however, have been recognized as expendable supplies for easily replacing the damaged ones after a strong earthquake because they are commonly designed to undergo concentrated force and deformation for the purpose of protecting the main structural members such as the columns and beams. In this paper, the use of new superelastic shape memory alloy (SMA) dampers that can partially recover their original configuration is proposed to decrease the repair cost. In addition, the conventional steel dampers used for improving the energy dissipation arising due to metallic yielding are additionally integrated into the bracing member. e behaviors of such bracing systems with the damper devices were reproduced in experimental tests with the cyclic loading history, and then their strength capacity and recentering capability were estimated based on the experiment results. Finally, additional experimental tests were performed by imposing cyclic loading histories with different loading speeds on the superelastic SMA and steel plate damper specimens.

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Development and experimental validation of a nickel–titanium shape memory alloy self-centering buckling-restrained brace

Cited by 428 publications

References 24 publications

Self-Centering Seismic Lateral Force Resisting Systems: High Performance Structures for the City of Tomorrow

Self-Centering Seismic Lateral Force Resisting Systems: High Performance Structures for the City of Tomorrow

Dual seismic-resistant steel frame with high post-yield stiffness energy-dissipative braces for residual drift reduction

Experimental Investigation on the Behavior of Bracing Damper Systems by Utilizing Metallic Yielding and Recentering Material Devices

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