Large-Scale Experimental Validation of Steel Posttensioned Connections with Web Hourglass Pins

Vasdravellis, George; Karavasilis, Theodore L.; Uy, Brian

doi:10.1061/(asce)st.1943-541x.0000696

Cited by 93 publications

(43 citation statements)

References 17 publications

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“…Several configurations of self-centering MRFs have been proposed, with the main difference being relevant to the type of energy dissipating device used, i.e. steel yielding based [20][21][22][23][24][25] or friction based [26][27][28][29]. Christopoulos et al [30] proposed a braced frame using self-centering braces.…”

Section: And Uangmentioning

confidence: 99%

“…The hourglass shape promotes a constant curvature profile and a uniform distribution of plastic deformations to delay fracture and increase energy dissipation. WHPs have been previously used by Vasdravellis et al [25] in a post-tensioned connection. Component tests on isolated WHPs conducted in [25] are shown in Fig.…”

Section: And Uangmentioning

confidence: 99%

“…WHPs have been previously used by Vasdravellis et al [25] in a post-tensioned connection. Component tests on isolated WHPs conducted in [25] are shown in Fig. 2b.…”

Section: And Uangmentioning

confidence: 99%

“…is a parameter that accounts for the additional flexibility due to local yielding in the supporting plates observed in the experimental validation [25] and is equal to 0.6. In the proposed system, !…”

Section: Design Of Bracing Members With Ssd-whpsmentioning

confidence: 99%

“…The mechanical characteristics of the WHPs are predicted by analytical equations derived from plastic analysis and simple mechanics, as described in detail in [25]. The assumed static system for half of a WHP is illustrated in Fig.…”

Section: Design Of Bracing Members With Ssd-whpsmentioning

confidence: 99%

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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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Section: And Uangmentioning

confidence: 99%

Section: And Uangmentioning

confidence: 99%

“…WHPs have been previously used by Vasdravellis et al [25] in a post-tensioned connection. Component tests on isolated WHPs conducted in [25] are shown in Fig. 2b.…”

Section: And Uangmentioning

confidence: 99%

Section: Design Of Bracing Members With Ssd-whpsmentioning

confidence: 99%

Section: Design Of Bracing Members With Ssd-whpsmentioning

confidence: 99%

See 3 more Smart Citations

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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Performance‐based assessment of seismic‐resilient steel moment resisting frames equipped with innovative column base connections

et al. 2021

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Low‐damage and self‐centring column base connections have been proposed in the last two decades as innovative solutions able to provide the seismic resilience in Moment Resisting Frames (MRFs). Although many works have demonstrated the benefits deriving from the adoption of these systems, only a few research studies investigated the significant parameters influencing their self‐centring capability. This paper investigates the influence of the frame layout (i.e., storeys and bays number) on the seismic performance of perimeter MRFs equipped with damage‐free self‐centring column bases previously studied by the authors. Nine case‐study perimeter steel MRFs are designed and modelled in OpenSees. Incremental Dynamic Analyses are performed monitoring both global and storey‐level Engineering Demand Parameters, including peak and residual interstorey drifts. Fragility curves are subsequently used to evaluate the self‐centring capability of the structures. The present study provides insights on the use of the adopted connections for the residual drift reduction of MRFs and defines the boundaries of the investigated parameters for their application. Results highlight that the self‐centring behaviour is particularly sensitive to the number of storeys and tends to reduce with the increasing height of MRFs equipped with the proposed connections.

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11.21: Experimental evaluation and explicit fracture simulations of stainless steel seismic dampers

2017

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Seismic dampers with high post-yield stiffness were recently proposed by the authors as the main energy dissipative system in a seismic-resistant steel frame. The dampers are hourglass-shaped pins made of duplex stainless steel and their high post-yield stiffness significantly reduced the residual drifts of the frame after the design earthquake. This work evaluates the cyclic behaviour of the proposed dampers both experimentally and numerically. Two different geometries of full-scale prototype dampers were tested under various standard and random cyclic loading protocols in a configuration that reproduced the damper-brace connection in the actual steel frame. The results of fourteen tests showed that the proposed dampers possess excellent hysteresis and fracture capacity. Following the tests, explicit numerical simulations were carried out using the Abaqus software. Geometry-independent fracture criteria were calibrated using the results of monotonic and cyclic tests on coupon specimens made of duplex stainless steel, and explicitly included in the numerical simulations of the dampers. The finite element models are able to accurately capture the initiation and evolution of fracture in the prototype dampers subjected to both standard and random cyclic loading histories. The results can be used to calibrate reliable macro-models for seismic collapse simulations of the proposed frame.

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Large-Scale Experimental Validation of Steel Posttensioned Connections with Web Hourglass Pins

Cited by 93 publications

References 17 publications

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

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

Performance‐based assessment of seismic‐resilient steel moment resisting frames equipped with innovative column base connections

11.21: Experimental evaluation and explicit fracture simulations of stainless steel seismic dampers

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