Posttensioned Seismic-Resistant Connections for Steel Frames

Ricles, James M.; Sause, Richard; Garlock, María Eugenia Moreyra; Zhao, Chen

doi:10.1061/(asce)0733-9445(2001)127:2(113)

Cited by 490 publications

(225 citation statements)

References 5 publications

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“…Steel self-centering moment-resisting frames (SC-MRFs) using post-tensioned (PT) beam-column connections are a promising class of resilient structures that exhibit softening force-drift behavior and eliminate beam inelastic deformations and residual drifts (Ricles et al 2001;Christopoulos et al 2002;Rojas et al 2004;Kim and Christopoulos 2008a;Tsai et al 2008;Chou and Lai 2009;Wolski et al 2009;Vasdravellis et al 2013a,b;Dimopoulos et al 2013). Seismic design procedures for SCMRFs are proposed in (Garlock et al 2007;Kim and Christopoulos 2008b).…”

Section: Introductionmentioning

confidence: 99%

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

Tzimas

Kamaris

Karavasilis

et al. 2016

Bull Earthquake Eng

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Abstract:The potential of post-tensioned self-centering moment-resisting frames (SCMRFs) and viscous dampers to reduce the collapse risk and improve the residual drift performance of steel buildings in near-fault regions is evaluated. For this purpose, a prototype steel building is designed using different seismic-resistant frames, i.e.: moment-resisting frames (MRFs); MRFs with viscous dampers; SC-MRFs; and SC-MRFs with viscous dampers. The frames are modeled in OpenSees where material and geometrical nonlinearities are taken into account as well as stiffness and strength deterioration. A database of 91 nearfault, pulse-like ground motions with varying pulse periods is used to conduct incremental dynamic analysis (IDA), in which each ground motion is scaled until collapse occurs. The probability of collapse and the probability of exceeding different residual story drift threshold values are calculated as a function of the ground motion intensity and the period of the velocity pulse. The results of IDA are then combined with probabilistic seismic hazard analysis models that account for near-fault directivity to assess and compare the collapse risk and the residual drift performance of the different seismic-resistant frames. The paper highlights the benefit of combining the post-tensioning and supplemental viscous damping technologies in the near-source. In particular, the SC-MRF with viscous dampers is found to achieve significant reductions in collapse risk and probability of exceedance of residual story drift threshold values compared to the MRF.

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Section: Introductionmentioning

confidence: 99%

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

Tzimas

Kamaris

Karavasilis

et al. 2016

Bull Earthquake Eng

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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%

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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“…SC-MRFs exhibit softening force-drift behavior and eliminate beam inelastic deformations and residual drifts (RDs) as the result of gap opening developed in beam-column interfaces and elastic PT bars which clamp beams to the columns and provide self-centering capability. PT connections use yielding-based [13][14][15][16][17][18][19] or friction-based [20][21][22][23] energy dissipation devices, which are activated when gaps open and can be easily replaced if damaged. Seismic design procedures for SC-MRFs have been proposed in [24][25].…”

Section: Introductionmentioning

confidence: 99%

Collapse Risk Evaluation of Self-Centering Steel MRFS With Viscous Dampers in Near-Fault Regions

Kamaris¹,

Tzimas²,

Karavasilis³

et al. 2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Posttensioned Seismic-Resistant Connections for Steel Frames

Cited by 490 publications

References 5 publications

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions

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

Collapse Risk Evaluation of Self-Centering Steel MRFS With Viscous Dampers in Near-Fault Regions

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