A finite element model for seismic response analysis of vertically-damped rocking-columns

Aghagholizadeh, Mehrdad

doi:10.1016/j.engstruct.2020.110894

Cited by 19 publications

(15 citation statements)

References 100 publications

(114 reference statements)

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“…To improve modeling of impact damping in the finite element method, researchers utilized the numerical damping generated by the Hilber-Hughes-Taylor (HHT) time-integration scheme, which was shown to dissipate seismic energy in short-time intervals, thus closely simulating the impact damping (Vassiliou et al, 2016;Aghagholizadeh, 2020). Outside existing finite element platforms, frame elements have been developed with methodologies to incorporate instantaneous or short-time impact energy loss (Diamantopoulos and Fragiadakis, 2019;Avgenakis and Psycharis, 2020).…”

Section: Modeling Approachesmentioning

confidence: 99%

Unbonded Post-tensioned Precast Concrete Walls With Rocking Connections: Modeling Approaches and Impact Damping

Kalliontzis

Nazari

2021

Front. Built Environ.

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Over the past two decades, precast concrete members have been utilized in seismically resilient structures. In developing these structures, different techniques have been used for connecting the precast members to the foundation. In building construction, unbonded post-tensioning (PT) tendons can anchor a precast wall to the foundation, resulting in the so-called rocking wall system. The rocking wall system develops a dry connection with the foundation and provides moment resistance by means of the PT tendons. The PT tendons remain elastic when the wall is subjected to design-level ground motions to preserve the re-centering capability of the wall. Moreover, the structural damage is concentrated near the wall toes and can be minimized with proper detailing of the toes. Rocking wall systems can consist of a Single precast Rocking Wall (SRW), which uses no supplemental damping, or walls with supplemental damping in the form of viscous or hysteretic energy dissipating devices. In addition to the supplemental damping, rocking walls dissipate the seismic energy through their impacts on the foundation base, their inherent viscous damping, and the hysteresis of concrete near the wall base. While the investigation of rocking walls continues to gain interest, there is no widely accepted means of modeling their dynamic behavior. This paper investigates two popular approaches for modeling rocking walls with and without supplemental damping: the finite element method and analytical modeling. The ability of the two approaches to capture the local and global responses of the walls is evaluated against shake table tests of walls with multiple-level intensity base motions. Next, the behavior characteristics of the two modeling approaches and their ability to simulate impact damping are discussed.

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Section: Modeling Approachesmentioning

confidence: 99%

Unbonded Post-tensioned Precast Concrete Walls With Rocking Connections: Modeling Approaches and Impact Damping

Kalliontzis

Nazari

2021

Front. Built Environ.

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“…In Equations () and (), the terms multiplied with the parameter

σ = m_{s} / m_{w}

are associated with the dynamics of the nonlinear oscillator, whereas the remaining terms are associated with the dynamics of the rocking wall with vertical dampers. When the yielding oscillator is absent (

σ = {ω_{1}}_{s} = ξ_{s} = 0

), Equations () and () reduce to the equations of motion of the free‐standing rocking wall equipped with dampers 44,45 …”

Section: Dynamics Of a Yielding Oscillator Coupled To A Rocking Wall mentioning

confidence: 99%

Response analysis of yielding structures coupled to rocking walls with supplemental damping

Aghagholizadeh

Makris

2021

Earthq Engng Struct Dyn

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Given that the coupling of a framing structure to a strong, rocking wall enforces a first-mode response, this paper investigates the dynamic response of a yielding single-degree-of-freedom oscillator coupled to a stepping rocking wall with supplemental damping (either hysteretic or linear viscous) along its sides. The full nonlinear equations of motion are derived, and the study presents an earthquake response analysis in terms of inelastic spectra. The study shows that for structures with preyielding period 1 < 1.0 s, the effect of supplemental damping along the sides of the rocking wall is marginal even when large values of damping are used. The study uncovers that occasionally, the damped response matches or exceeds the undamped response; however, when this happens, the exceedance is marginal. The paper concludes that for yielding structures with strength less than 10% of their weight, the use of supplemental damping along the sides of a rocking wall coupled to a yielding structure is not recommended. The paper shows that supplemental damping along the sides of the rocking wall may have some limited beneficial effects for structures with longer preyielding periods (say 1 > 1.0 s). Nevertheless, no notable further response reduction is observed when larger values of hysteretic or viscous damping are used.

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“…With this design option, the amount of rotation would be very limited. The second kind of control is the use of energy dissipation devices (Figure 1D), such as the base-plate-yielding rocking systems, 15 the replaceable reinforcing steel bars in short length, 16 the dampers [17][18][19] or the inerters. [20][21][22][23][24] The third kind is the combined use of the prestressing cables and energy dissipation devices, such as the combination of cables with the dampers, 25 the energy dissipation bars, 26 the steel sleeve, 27,28 or the O-shaped connectors.…”

Section: Introductionmentioning

confidence: 99%

Seismic protection by rocking with superelastic tendon restraint

Tsang

Lam

2022

Earthq Engng Struct Dyn

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This article introduces an innovative system for enhancing the seismic performance of a structure through facilitating large rotational (rocking) motion to occur without risking overturning. The innovation of this study is in the use of tendons consisting of Nickel‐Titanium (superelastic) alloy connected in series with steel to impose partial restraints to the structure when experiencing rocking motion. Importantly, the large rotational motion is fully recoverable. Existing installations which can be made to rock may also be retrofitted with the device for improving its seismic resistance. The original contributions of the article are the derivation, and experimental validation, of an analytical model for simulating the seismic performance of a system that has been fitted with the restraining device. In a parametric study employing the newly developed modelling techniques, major trends in the seismic response behaviour of the structure have been identified.

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A finite element model for seismic response analysis of vertically-damped rocking-columns

Cited by 19 publications

References 100 publications

Unbonded Post-tensioned Precast Concrete Walls With Rocking Connections: Modeling Approaches and Impact Damping

Unbonded Post-tensioned Precast Concrete Walls With Rocking Connections: Modeling Approaches and Impact Damping

Response analysis of yielding structures coupled to rocking walls with supplemental damping

Seismic protection by rocking with superelastic tendon restraint

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