Friction Model for Sliding Bearings under Seismic Excitation

Lomiento, Giuseppe; Bonessio, Noemi; Benzoni, Gianmario

doi:10.1080/13632469.2013.814611

Cited by 98 publications

(73 citation statements)

References 18 publications

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“…More specifically, a plethora of studies have been presented in the literature addressing the dependence of the friction coefficient upon contact pressure, sliding velocity and repetition of cycles that induces temperature rise at the sliding interfaces, see e.g. [3,5,9,10,11,13,14,17] just to quote a few. The common backbone of these studies is to alert the structural designer against oversimplification of the FPS behavior at the modeling stage.…”

Section: Critical Remarks On the Unidirectional Model With Coulomb Frmentioning

confidence: 99%

“…Besides these advantages, experimental investigations on FP bearings have shed light on their highly complex, nonlinear mechanical behavior, especially when tested under multi-directional paths like in a real earthquake scenario [5,13,14,10,16]. Nevertheless, some aspects recorded in experiments are not properly addressed in existing codes and typically neglected in structural models, based on extreme simplification of the device behavior.…”

Section: Introductionmentioning

confidence: 99%

“…As will be shown in this paper, special care should be taken to the technological design and manufacturing aspects not only of the primary sliding surface, but also of the secondary rotation surface, indeed also the latter surface affects, to some extent, the overall energy dissipated by the device. Recent progress achieved in the development and improvement of materials along with sophisticated lubrication techniques have permitted manufacturing FP bearings with very small dynamic friction coefficients, down to the order of ⇡ 1 ÷ 5% [5,14]. The FPS is sometimes presented in an upside-down configuration as compared to Fig.…”

Section: Introductionmentioning

confidence: 99%

“…To this aim, a 3D finite element (FE) model is set up in order to simulate the mechanical behavior of a real FP bearing. The examined isolator was tested at the Caltrans SRMD testing facility at the University of California San Diego (UCSD) [13,14]. Reference experiments concern cloverleaf bi-directional tests under three different vertical loads.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Assessment of Concave Sliding Isolator’s Mechanical Behavior Under Bi-Directional Motion

Domenico¹,

Ricciardi²,

Benzoni³

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. In this contribution, some aspects of the mechanical behavior of friction pendulum (FP) isolators are investigated from a numerical point of view. Attention is focused on the distinctive features observed in FP bearings when subjected to multi-directional excitations like those occurring in a real earthquake scenario. Due to the peculiarities related to the kinematics of the device and the curvature of the sliding surface, neglecting the bi-directional interaction and considering a uni-directional idealization would lead to underestimate the displacements expected during seismic events and to overestimate the dissipative capacity of the isolator accordingly. Furthermore, the resultant horizontal force of the FP bearing may differ markedly from what expected (and predicted by most numerical models) in the uni-directional case. This deviation is mainly ascribed to the geometrical features of the device itself. Additionally, the force-displacement behaviour of the FP bearing depends upon the coefficient of sliding friction, which is not constant as postulated by the simplified Coulomb model but varies during the course of an earthquake with sliding velocity, vertical load and, above all, repetition of cycles and consequent heating phenomena arising at the sliding interface. Among these effects, frictional heating has been recognized as the most important factor that affects the FP maximum displacement because it may induce significant friction degradation, consequently it should be properly considered in a truthful model of the FP bearing via a sophisticated coupled thermo-mechanical analysis.The aim of this paper is to scrutinize the above physical phenomena by means of a 3D finite element model. The developed model allows us to closely analyze the kinematics of the device, to assess the contact force distribution between the sliding surfaces and to examine certain nonlinear phenomena that become manifest especially during bi-directional excitations.

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Section: Critical Remarks On the Unidirectional Model With Coulomb Frmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Assessment of Concave Sliding Isolator’s Mechanical Behavior Under Bi-Directional Motion

Domenico¹,

Ricciardi²,

Benzoni³

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

Self Cite

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“…The magnitude of μ is a function of different parameters such as the sliding velocity and the vertical pressure, as well as cycling and breakaway effects. [39] This study considers only the dependence of the friction coefficient on the velocity, as expressed by the equation: [17] μ…”

Section: Mechanical Behavior and Design Of Single Curved-surface Slmentioning

confidence: 99%

Novel procedure for reliability-based cost optimization of seismically isolated structures for the protection of critical equipment: A case study using single curved surface sliders

Moeindarbari

Taghikhany

2017

Struct Control Health Monit

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SummaryThe optimized reliability-based design of seismic isolated structures requires a consideration of the failure probability of the system, in addition to the optimization objectives. The stochastic nature of a given system (e.g., the probable input ground motion) must therefore be properly included in the analysis model. To address this challenge, a novel procedure is developed and examined on a 3-story isolated concrete building model, to minimize the total construction cost of the system with regards to protecting sensitive equipment located within the structure.In this procedure, the structure performance and reliability were first evaluated using time-consuming Monte Carlo simulations. We then employed artificial neural networks as a response surface to facilitate the prediction of the failure probability for the supposed structure. To simulate seismic excitations, we generated artificial ground motion combining random high-frequency and long-period components.Also, a newly developed sensitivity analysis method was used to identify the critical uncertain parameters of the system. Finally, by using a simulated annealing algorithm, we determined the optimal design variables of the structure and isolation system for a range of desired probabilities of failure.The optimal results indicate that, for different target failure probability ranges, some design variables are more significant than others. KEYWORDS base isolation, critical equipment protection, neural network, reliability based cost optimization, sensitivity analysis, spectral non-stationarity

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Hybrid simulation of a multi‐span RC viaduct with plain bars and sliding bearings

Abbiati

Bursi

Philippe

et al. 2015

Earthq Engng Struct Dyn

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Summary This paper deals with the seismic response assessment of an old reinforced concrete viaduct and the effectiveness of friction‐based retrofitting systems. Emphasis was laid on an old bridge, not properly designed to resist seismic action, consisting of 12 portal piers that support a 13‐span bay deck for each independent roadway. On the basis of an OpenSEES finite element frame pier model, calibrated in a previous experimental campaign with cyclic displacement on three 1:4 scale frame piers, a more complex experimental activity using hybrid simulation has been devised. The aim of the simulation was twofold: (i) to increase knowledge of non‐linear behavior of reinforced concrete frame piers with plain steel rebars and detailing dating from the late 1950s; and (ii) to study the effectiveness of sliding bearings for seismic response mitigation. Hence, to explore the performance of the as built bridge layout and also of the viaduct retrofitted with friction‐based devices, at both serviceability and ultimate limit state conditions, hybrid simulation tests were carried out. In particular, two frame piers were experimentally controlled with eight‐actuator channels in the as built case while two frame piers and eight sliding bearings were controlled with 18‐actuator channels in the isolated case. The remaining frame piers were part of numerical substructures and were updated offline to accurately track damage evolution. Copyright © 2015 John Wiley & Sons, Ltd.

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Friction Model for Sliding Bearings under Seismic Excitation

Cited by 98 publications

References 18 publications

Numerical Assessment of Concave Sliding Isolator’s Mechanical Behavior Under Bi-Directional Motion

Numerical Assessment of Concave Sliding Isolator’s Mechanical Behavior Under Bi-Directional Motion

Novel procedure for reliability-based cost optimization of seismically isolated structures for the protection of critical equipment: A case study using single curved surface sliders

Hybrid simulation of a multi‐span RC viaduct with plain bars and sliding bearings

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