Seismic Behavior and Design of Unbonded Post-Tensioned Precast Concrete Walls

Kurama, Yahya C.; Pessiki, Stephen; Sause, Richard; Lu, Le‐Wu

doi:10.15554/pcij.05011999.72.89

Cited by 252 publications

(199 citation statements)

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“…Generally, all systems performed better in far-field excitations compared with near-fault excitations, with 39 55-69% amplification in the M (Figure 12(b)). In comparison with the far-field earthquake example, systems with hysteretic-only energy dissipation have higher M under near-fault excitation 41 as expected. The efficiency and advantage of AFS systems (BLEV and AFS2) are more appreciable in near-fault earthquakes.…”

Section: Seismic Response Under In Near-fault Earthquakes and Near-fasupporting

confidence: 73%

“…Several researches 21 have combined alternative energy dissipation (friction or viscous) in parallel with self-centering elements, particularly for structural walls [37,[41][42][43] single-type dissipation in parallel with self-centering element can be modelled using a velocityproportional dashpot in parallel with bi-linear elastic self-centering spring, as shown in Intuitively, added velocity-proportional dampers yield higher energy dissipation capacity under 1 near-fault excitations. However, self-centering systems with viscous-only damping would encounter limited energy dissipation and excessive induced damper force in scenario of relatively low or 3 excessively high excitation velocity, respectively.…”

Section: Blev Systems-velocity-proportional Dissipating Mechanisms Comentioning

confidence: 99%

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Self‐centering structural systems with combination of hysteretic and viscous energy dissipations

Kam

Pampanin

Palermo

et al. 2010

Earthq Engng Struct Dyn

107

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SUMMARY 7This paper presents an innovative set of high-seismic-resistant structural systems termed Advanced FlagShaped (AFS) systems, where self-centering elements are combined in series and/or in parallel with 9 alternative forms of energy dissipation (yielding, friction and viscous damping). AFS systems is developed using the rationale of combining velocity-dependent with displacement-dependent energy dissipation for 11 self-centering systems, particularly to counteract near-fault earthquakes. Non-linear time-history analyses (NLTHA) on a set of four single-degree-of-freedom (SDOF) systems under a suite of 20 far-field and 13 20 near-fault ground motions are used to compare the seismic performance of AFS systems with the conventional systems. It is shown that AFS system with a combination of hysteretic and viscous energy 15 dissipations achieved greater performance in terms of the three performance indices. The use of friction slip in series of viscous energy dissipation is shown to limit the peak response acceleration and induced 17 base-shear. An extensive parametric analysis is carried out to investigate the influence of two design parameters, 1 and 2 on the response of SDOF AFS systems with initial periods ranging from 0.2 to 3.0 s 19 and with various strength levels when subjected to far-field and near-fault earthquakes. For the design of self-centering systems with combined hysteretic and viscous energy dissipation (AFS) systems, 1 is 21 recommended to be in the range of 0.8−1.6 while 2 to be between 0.25 and 0.75 to ensure sufficient self-centering and energy dissipation capacities, respectively.

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Section: Seismic Response Under In Near-fault Earthquakes and Near-fasupporting

confidence: 73%

Section: Blev Systems-velocity-proportional Dissipating Mechanisms Comentioning

confidence: 99%

Self‐centering structural systems with combination of hysteretic and viscous energy dissipations

Kam

Pampanin

Palermo

et al. 2010

Earthq Engng Struct Dyn

107

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“…Few studies investigated the effectiveness of combining self-centering systems with viscous dampers to increase seismic resilience. The use of viscous dampers in parallel to self-centering rocking walls has been proposed as an effective way to control peak story drifts and residual drifts (Kurama 2000). The parallel combination of hysteretic and viscous energy dissipation along with a friction slip mechanism in series connected to the viscous energy dissipation mechanism were found to achieve high levels of seismic performance (Kam et al 2010).…”

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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“…The use of viscous dampers in parallel to selfcentering precast concrete base rocking walls has been proposed as an effective way to control peak story drifts [30]. The parallel combination of hysteretic and viscous energy dissipa-tion along with a friction slip mechanism in series connected to the viscous energy dissipation mechanism were found to achieve high levels of seismic performance for self-centering systems [31].…”

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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Seismic Behavior and Design of Unbonded Post-Tensioned Precast Concrete Walls

Cited by 252 publications

References 0 publications

Self‐centering structural systems with combination of hysteretic and viscous energy dissipations

Self‐centering structural systems with combination of hysteretic and viscous energy dissipations

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

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

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