Academic literature on the topic 'Friction isolator'
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Journal articles on the topic "Friction isolator"
1
Mondal, Papiya D., Aparna D. Ghosh, and Subrata Chakraborty. "Performances of Various Base Isolation Systems in Mitigation of Structural Vibration Due to Underground Blast Induced Ground Motion." International Journal of Structural Stability and Dynamics 17, no. 04 (April 6, 2017): 1750043. http://dx.doi.org/10.1142/s0219455417500432.
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A comparative study is carried out on the performance of various elastomeric and frictional base isolation (BI) systems in the vibration mitigation of structures subjected to underground blast induced ground motion (BIGM). The parametric sensitivities of the base isolated structures to variations in the design parameters of the isolators are examined for different intensities of blast input. Results indicate that substantial reductions in both the acceleration and displacement responses of the structure can be achieved by the different base isolators. Generally, the Electricite de France (EDF) base isolator produces higher peak response reductions. However, peak bearing displacements are also largest here. The pure friction (P-F), resilient-friction base isolator (R-FBI) and friction pendulum (FP) systems produce lower values of response reductions but peak bearing displacements as well as residual displacements of isolators are also low. The New Zealand (N-Z) system provides good response reductions with a low to moderate value of peak bearing displacement. The present study indicates how a proper selection of the type of BI system with suitable design parameters can mitigate structural vibration due to different intensities of BIGM and restrict the unwanted characteristics of large isolator displacement and its permanent deformation.
2
Lu, Lyan-Ywan, and Chia-Chiea Hsu. "Eccentric Rocking Bearings with a Designable Friction Property for Seismic Isolation: Experiment and Analysis." Earthquake Spectra 29, no. 3 (August 2013): 869–95. http://dx.doi.org/10.1193/1.4000166.
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The friction coefficient plays a critical role in a friction-type isolator, since it determines the transmitted seismic force and the energy dissipation capacity of the isolator, simultaneously. However, the choice of feasible sliding materials that possess appropriate friction coefficients is very limited, and this has restricted the development and applications of friction-type isolators. To overcome this, an isolator called the eccentric rocking bearing (ERB) with the property of designable friction is introduced in this study. By using an eccentric rolling mechanism, the ERB bearing is self-centering and its effective friction coefficient is adjustable by a geometric parameter that can be designed by engineers. The results of a shaking table test conducted on an ERB-isolated full-scale structure have confirmed the feasibility and efficiency of the ERB bearings for seismic isolation. Additionally, the high consistency between the simulated and experimental dynamic responses verifies the method developed to analyze the ERB.
3
Hou, Jun Fang, Rong Li Li, Guang Chun Yu, Tao Luo, and Hai Wen He. "Contrast Test Research on Application of Dry Friction Isolators to Vibration Isolation of Vehicle Electronic Devices." Applied Mechanics and Materials 505-506 (January 2014): 360–64. http://dx.doi.org/10.4028/www.scientific.net/amm.505-506.360.
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As regards the reliability of the vehicle electronic devices on the tracklayer getting worse due to severe vibration, isolation theory and mechanical model of the GWF vibration isolator and wire-mesh vibration isolator were analyzed, and the test research on the isolation effectiveness of the two isolators applied to the isolation of the vehicle electronic devices were carried out. The test results show that the vibration source of the foundation of the electronic device is mainly from the structure resonance, and the two dry friction vibration isolators exhibit excellent isolation effectiveness on different roads and at different speed. The wire-mesh vibration isolator shows better performance than GWF vibration isolator on three-dimensional comprehensive isolation.
4
Zhang, Wei, Xiaoping Li, Jian Li, and Xiqiu Li. "An Improved Structural Analysis Method for Isolator with Quasi-Zero-Stiffness Characteristic." Shock and Vibration 2021 (December 15, 2021): 1–13. http://dx.doi.org/10.1155/2021/9920674.
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A typical quasi-zero-stiffness (QZS) vibration isolator consisting of a vertical spring and two oblique springs has been widely researched on its static and dynamic characteristics. A general criterion for determining structural parameters of QZS isolator is to achieve low nondimensional stiffness around the equilibrium position. However, lower nondimensional stiffness of linear isolator means lower isolation frequency, which may be invalid on QZS isolator. Because there is an implicit relationship between geometric parameter and stiffness ratio of QZS isolator, this study presents an improved optimization criterion for determining the optimal structural parameters of the typical QZS isolator. The optimization criterion is that the QZS isolator has the maximum displacement range around the equilibrium position without exceeding given natural frequency, rather than given nondimensional stiffness. The results show that isolator with these optimal parameters can achieve lower stiffness around the equilibrium position and better vibration isolation performance. Furthermore, an extended QZS isolator consisting of vertical spring with fixed stiffness and prestressed oblique springs is discussed to further improve stiffness characteristic. Better stiffness performance can be obtained when the prestressed oblique springs have softening stiffness and the exponent of the nonlinear stiffness is 2. Considering the existence of friction in practical application, the influence of friction on both static and dynamic characteristics is investigated. The analysis reveals that friction has little influence on its stiffness characteristic around the static equilibrium position and friction damping produced by friction affects the response amplitude and resonant frequency in dynamics.
5
Vibhute, A. S., S. D. Bharti, M. K. Shrimali, and S. Vern. "Seismic Performance of Elastomeric and Sliding Friction Isolation System." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (December 19, 2022): 815–19. http://dx.doi.org/10.38208/acp.v1.588.
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The base isolation technique is widely used in the isolation of structures for providing efficient protection to structures concerning different loadings. This study aims to evaluate comparative performance and inelastic responses of the base-isolated structure for two types of isolation systems under the Far-field and Near-field earthquake. For this purpose, seismic response quantities like base shear, peak ?oor displacement, absolute acceleration, and isolator displacement for ten-story reinforced concrete building frame base isolated by lead rubber bearings (LRBs) are evaluated and compared with the seismic response of the same structure base isolated by Friction Pendulum Bearing Isolator. Nonlinear time history analysis is carried out to investigate the inelastic behavior of the base-isolated structure. The building frame was designed according to IS1893:2016 seismic code and IS 456:2000. To represent a wide range of assessments, a 10 storey building frame taking identical isolation parameters for elastomeric and sliding isolation system was analyzed in SAP 2000. It was observed that the responses of both the isolation system are nearly the same for all the three earthquakes.
6
Zelleke, Daniel H., Said Elias, Vasant A. Matsagar, and Arvind K. Jain. "Supplemental dampers in base-isolated buildings to mitigate large isolator displacement under earthquake excitations." Bulletin of the New Zealand Society for Earthquake Engineering 48, no. 2 (June 30, 2015): 100–117. http://dx.doi.org/10.5459/bnzsee.48.2.100-117.
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The effect of viscous, viscoelastic, and friction supplemental dampers on the seismic response of base-isolated building supported by various isolation systems is investigated. Although base-isolated buildings have an advantage in reducing damage to the superstructure, the displacement at the isolation level is large, especially under near-fault ground motions. The influence of supplemental dampers in controlling the isolator displacement and other responses of base-isolated building is investigated using a multi-storey building frame. The coupled equations of motion are derived, solved and time history analysis is carried out on a building modeled with fifteen combinations of five isolation systems and three passive dampers. The seismic responses are compared with that of the fixed-base and base-isolated buildings. Based on the results, it is concluded that supplemental dampers are beneficial to control the large deformation at the isolator level. Parametric study is conducted and optimum ranges of damper parameters to achieve reduced isolator displacement without adverse effect on the other responses are determined. Further, it is concluded that the combination of the resilient-friction base isolator (R-FBI) and viscous damper is the most effective in reducing the bearing displacement without significant increase in superstructure forces.
7
Lee, Donghun, and Michael C. Constantinou. "Quintuple Friction Pendulum Isolator: Behavior, Modeling, and Validation." Earthquake Spectra 32, no. 3 (August 2016): 1607–26. http://dx.doi.org/10.1193/040615eqs053m.
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This paper describes the behavior of the quintuple friction pendulum isolator, a spherical sliding isolator with six sliding surfaces, five effective pendula, and nine regimes of operation that allow for complex multi-stage adaptive behavior depending on the amplitude of displacement. An analytical model is presented that is capable of tracing the behavior of the isolator in two general configurations of geometric and frictional properties. This analytical model is useful for verifying computational models and in performing simplified calculations for analysis and design. A computational model that can be implemented in the program SAP2000 is also presented and verified by comparison to the analytical model. A model quintuple friction pendulum isolator has been tested and the results have been used to validate the analytical and computational models.
8
Rawat, Aruna, Naseef Ummer, and Vasant Matsagar. "Performance of bi-directional elliptical rolling rods for base isolation of buildings under near-fault earthquakes." Advances in Structural Engineering 21, no. 5 (August 25, 2017): 675–93. http://dx.doi.org/10.1177/1369433217726896.
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Rolling base isolation system provides effective isolation to the structures from seismic base excitations by virtue of its low frictional resistance. Herein, dynamic analysis of flexible-shear type multi-storey building mounted on orthogonally placed elliptical rolling rod base isolation systems subjected to bi-directional components of near-fault earthquake ground motions is presented. The orthogonally placed rods would make it possible to resist the earthquake forces induced in the structure in both the horizontal directions. The curved surface of these elliptical rods has a self-restoring capability due to which the magnitude of peak isolator displacement and residual displacement is reduced. The roughness of the tempered curved surface of the rollers dissipates energy in motion due to frictional damping. The seismic performance of the multi-storey building mounted on the elliptical rolling rod base isolation system is compared with that mounted on the sliding pure-friction and cylindrical rolling rod systems. Parametric studies are conducted to examine the behavior of the building for different superstructure flexibilities, eccentricities of the elliptical rod, and coefficients of friction. It is concluded that the elliptical rolling rod base isolation system is effective in mitigation of damaging effects of the near-fault earthquake ground motions in the multi-storey buildings. Even under the near-fault earthquake ground motions, the base-isolated building mounted on the elliptical rolling rods shows considerable reduction in seismic response. The isolator displacement with the elliptical rolling rod base isolation system is less in comparison to the pure-friction and cylindrical rolling rod systems.
9
Abed, Dana, Jafar Al Thawabteh, Yazan Alzubi, Jamal Assbeihat, and Eid Al-Sahawneh. "Influence of Earthquake Parameters on the Bi-directional Behavior of Base Isolation Systems." Civil Engineering Journal 8, no. 10 (October 1, 2022): 2038–52. http://dx.doi.org/10.28991/cej-2022-08-10-02.
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The introduction and development of the base isolation systems, especially the friction isolator device, were done recently to improve the capacity of adaptive behavior. The efficiency of multi-phase friction pendulums comes from their complexity, which helps reduce the structural responses and enhance structures' energy dissipation under lateral loads. Nevertheless, the influence of various earthquakes' properties on the behavior of base-isolation systems subjected to bi-directional seismic loading is still unclear. Hence, further research and studies regarding the behavior and capability of these systems under bi-directional loading are still necessary before incorporating this device in real-life practical applications. Therefore, this paper is intended to investigate the bi-directional behavior of the friction isolator subjected to various ground motion records. In order to do so, different versions of the friction pendulum system are selected and compared within the study context. Generally, the study's results have shown that the behavior of the friction isolator is highly dependent on low values of the PGA/PGV ratio. Besides, pulse-like earthquakes considerably impact the response of the isolator compared to non-pulse-like ones. Doi: 10.28991/CEJ-2022-08-10-02 Full Text: PDF
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Ozbulut, Osman E., and Stefan Hurlebaus. "A Comparative Study on the Seismic Performance of Superelastic-Friction Base Isolators against Near-Field Earthquakes." Earthquake Spectra 28, no. 3 (August 2012): 1147–63. http://dx.doi.org/10.1193/1.4000070.
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This paper presents a comparative seismic performance assessment of super-elastic-friction base isolator (S-FBI) systems in improving the response of bridges under near-field earthquakes. The S-FBI system consists of a steel-Teflon sliding bearing and a superelastic shape memory alloy (SMA) device. The other isolation systems considered here are lead rubber bearing (LRB), friction pendulum system (FPS), and resilient-friction base isolator (R-FBI). Each isolation system is designed to provide the same isolation period and characteristic strength. Nonlinear time-history analyses of an isolated bridge are performed to compare the performance of various isolation systems. The results indicate that the S-FBI system shows superior performance in reducing deck displacement response and effectively limits permanent bearing deformation, whereas residual deformations are present for the other isolation systems in some cases. It is also observed that the LRB system has the largest deck drifts while the FPS system and R-FBI system produce the smallest peak deck acceleration and base shear.
Dissertations / Theses on the topic "Friction isolator"
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Ozkaya, Cenan. "Development Of A New Seismic Isolator Named." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612712/index.pdf.
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The experimental research presented in this dissertation aims to develop a new rubber&ndashbased seismic isolator type on the basis of the idea that the damping of a conventional annular elastomeric bearing (EB) can be increased by filling its central core with small diameter steel balls, which dissipate energy via friction inside the confined hole of the bearing during their movements under horizontal loads. The proposed bearing type is called &ldquo
Ball Rubber Bearing (BRB)&rdquo
. A large set of BRBs with different geometrical and material properties are manufactured and tested under reversed cyclic horizontal loading at different vertical compressive load levels. Effect of supplementary confinement in the central hole of the bearing to performance of BRB is studied by performing some additional tests. Test results are used to develop design equations for BRB. A detailed non-linear finite element model is developed to verify the test results. The proposed analytical model is determined to simulate the structural hysteretic behaviour of the bearings. In design of BRBs, the proposed design guideline can be used in conjunction with the proposed non-linear finite element analysis. Extensive test results indicate that steel balls do not only increase the energy dissipation capacity of the elastomeric bearing (EB) but also increase its horizontal and vertical stiffness. It is also observed that the energy dissipation capacity of a BRB does not degrade as the number of loading cycles increases, which indicates remarkably reliable seismic performance.
2
Ismail, Mohd. "Shock isolation systems incorporating Coulomb friction." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/348953/.
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This study investigates a novel approach to the problem of shock isolation. The questions considered are whether friction produces a better performance in terms of reduced response during a shock compared to viscous damping and a lower residual response after the shock. To gain physical insight, a single degree of freedom model with friction applied to the isolated mass is analysed. It serves as a benchmark to the performance of a two degree of freedom model where friction is applied to a secondary mass. The isolation system performance is then quantified. For the two degree of freedom system with an intermediate secondary spring which connects the primary and secondary mass, it is possible to obtain the reduction in the displacement response as good as the single degree of freedom system and at the same time smoother acceleration response compared to the single degree of freedom system. For the purpose of further improvement, a control strategy is introduced to switch on and off friction in both models depending on some response parameters and this is compared to the passive systems. This is the semi active control strategy where friction is changed within a cycle of vibration (discontinuous). The control strategy provides more displacement reduction to ensure the maximum displacement response is much smaller than the base input which cannot be obtained with the passive systems. The practical implementation and experimental validation is presented only for the first stage of the response during the shock. For the practical implementation of the switchable friction, an electromagnet is applied to separate the friction surfaces. Good agreement with the simple theoretical models for both passive and switchable systems is obtained. The reduced displacement and smooth acceleration response were obtained from the experiments with the system used to represent the two degree of freedom model. The issues and limitations in the practical implementation are identified and discussed.
3
Jamali, Navid [Verfasser]. "On the numerical simulation of friction isolated structures / by Navid Jamali." Wuppertal : Inst. für Konstruktiven Ingenieurbau, 2008. http://d-nb.info/1000817172/34.
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Iliadis, Charalampos. "Friction-based control system for seismic energy dissipation with isolated stories." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66834.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 37-38).
The implementation of various structural control systems, such as passive, semi-active or active is not a new concept. They are incorporated in structures to increase the performance under seismic and/or wind loading either by adding stiffness or inducing counteracting forces which dissipate energy in various ways. In order to efficiently dissipate the seismic energy with existing schemes, large structural displacements are required. However, structures that are most vulnerable to earthquakes such as low-rise relatively stiff buildings, cannot experience significant displacements. Therein lies the challenge the author attempts to address by proposing a structural scheme which can be applied to low-rise concrete buildings to efficiently dissipate seismic energy and at the same time to considerably decrease the forces in the structural members for a given seismic excitation. In this thesis the design of this new structural scheme is described and a case study is performed in order to demonstrate its effectiveness and applicability.
by Charalampos Iliadis.
M.Eng.
5
Lodato, Alessio. "Analisi dell’affidabilità sismica delle strutture isolate mediante dispositivi Friction Pendulum Bearings System." Doctoral thesis, Universita degli studi di Salerno, 2016. http://hdl.handle.net/10556/2467.
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2014 - 2015The thesis investigates the seismic reliability of isolated structures with FPBs (Friction Pendulum Bearings) towards failure due to high vertical component excitation and friction coefficient variations. In the end, it has been studied the influence of the uncertainty of the input excitation on the vulnerability of complex structures such as viaducts in the case of different seismic isolation strategies application. The last seismic events (Christchurch 2011, L’Aquila 2009) have highlighted lacks in the actual design philosophies (PBD) due to the high structural damage experimented by structures. The Passive Control Technique of seismic response allows high structural performances respect to the one of fixed base structures, in this way making sustainable the repairing costs of structures in the case of medium high intensity seismic event. After introducing a rich bibliography on matemathical theory of base isolated structures, with some remarks on the state space formulation which allow to carry out modal analysis of non classically damped structures such as the one object of the study, on the mechanical and dynamical behavior of Friction Pendulum System device and on the current Technical Code in Italy (NTC08), it has been introduced the theme to be investigated. Being the FPS behavior related to the friction force, the seismic response can be affected by particular seismic event as near fault event characterized by high vertical component intensity of seismic excitation. Moreover the degradation of the sliding interface due to velocity, pressure and temperature variations can influence the seismic response of the device. To the scope of investigating the collapse phenomenon of the device, non linear dynamic analysis have been carried out through deterministic parametric methods with different near fault input excitations, on two different systems: the first described by a rigid superstructure and isolation system described by the Nagarajaiah model (1990), the second representative of a benchmark r.c. building of four levels (Almazan 2003). The subsequent stochastic analysis carried out by means of the use of Montecarlo simulation, taking advantage of the inversion method, on a system described by rigid superstructure and isolation system described by a rigid-plastic behavior with hardening, have highlighted the relation between the stochastic response and the uncertainty of the friction coefficient in the case of sinusoidal excitation. Finally, it has been investigated the vulnerability of bridge structures in different isolation system design configurations by using fragility analysis, carried out taking advantage of the Multi Stripes method (Baker 2014). Results show the probability of exceedance of the limit state considered variations taking into account the uncertainty of the input excitation. [edited by author]
Il lavoro di tesi ha indagato l’affidabilità sismica delle strutture isolate mediante dispositivi FPBs (Friction Pendulum Bearings) nei confronti dei fenomeni dello scalottamento e delle variazioni del coefficiente d’attrito che caratterizza l’interfaccia di scorrimento del dispositivo. In ultima analisi, è stata indagata l’influenza dell’aleatorietà dell’input in ingresso sulla vulnerabilità di strutture complesse quali viadotti nel caso di applicazione di differenti strategie di isolamento. Gli ultimi eventi sismici (Christchurch 2011, L’Aquila 2009) hanno evidenziato carenze nelle filosofie prestazionali attuali (PBD) a causa dell’elevato danneggiamento agli elementi strutturali sperimentato dalle costruzioni. Le tecniche di controllo passivo della risposta sismica consentono elevate prestazioni in termini di performance strutturali rispetto a quelle a base fissa, in tal modo rendendo sostenibili i costi di riparazione delle costruzioni in caso di eventi sismici di medio alta intensità. Dopo una ricca bibliografia sulla teoria matematica alla base delle strutture isolate, con cenni alla formulazione nello spazio degli stati che consente l’analisi modale di strutture non classicamente smorzate, sul comportamento meccanico e dinamico del dispositivo Friction Pendulum System e sulle attuali Norme Vigenti in Italia (NTC08), si è introdotta la problematica oggetto di studio. Essendo il comportamento del dispositivo FPS dipendente dalla forza d’attrito, la risposta sismica può essere affetta da particolari eventi sismici di tipo near fault caratterizzati da componenti verticali dell’eccitazione sismica di elevata intensità. Inoltre l’usura della superficie di scorrimento dovuta a variazioni di velocità, pressione e temperatura può influenzare la risposta sismica del dispositivo. Al fine di indagare il fenomeno dello scalottamento del dispositivo sono state condotte analisi dinamiche non lineari mediante metodologie deterministiche parametriche con differenti eccitazioni in ingresso di tipo near fault, su un sistema descritto da una sovrastruttura rigida e sistema di isolamento descritto dal modello di Nagarajaiah (1990), e su un sistema rappresentativo di un edificio benchmark in c.a. a 4 livelli (Almazan 2003). Inoltre, le successive analisi stocastiche condotte mediante l’utilizzo della simulazione Montecarlo, sfruttando il metodo dell’inversione, su un sistema descritto da sovrastruttura rigida e sistema di isolamento descritto da una legge attritiva rigido plastica con incrudimento, hanno messo in evidenza la dipendenza della risposta stocastica dall’aleatorietà del coefficiente d’attrito nei confronti di eccitazioni sinusoidali. Infine è stata indagata la vulnerabilità di strutture da ponte in differenti configurazioni di progetto del sistema di isolamento mediante analisi di fragilità condotte sfruttando il metodo Multi Stripes (Baker 2014). Esse mostrano le variazioni nella probabilità di superamento degli stati limite in considerazione dell’aleatorietà dell’input in ingresso. [a cura dell'autore]
XIV n.s.
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Boral, Caner. "Desing Of An Engine Mount With Dry Friction Damping." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12612132/index.pdf.
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Automotive engine mounts are used to support engine weight, protect engine from road inputs and isolate transmission of vibrations created by the engine, which has a drastic effect on the noise generated inside the passenger cabin. Most common types of engine mounts are elastomeric and hydraulic mounts, the former having better vibration isolation characteristics whereas the latter displays better shock isolation. Elastomeric mounts are widely used for their low initial cost, while hydraulic mounts with inertia track and decoupler are chosen for their good vibration isolation and shock excitation characteristics. However, hydraulic mounts with inertia track and decoupler are not appropriate for small segment and commercial vehicles due their high initial cost. In this thesis, the effect of the addition of a dry friction damper on the performance of elastomeric automobile engine mounts is investigated. Friction dampers are used to attenuate vibration amplitudes in many applications such as gas turbine engines, railway vehicles, space structures and civil buildings. In this study, a friction element is added to the engine mount at its axial direction and its effect is studied. Results show that, the addition of dry friction damping to the original system increases vibration isolation performance significantly at low frequencieswhereas, due to the increased stiffness of the system, at high frequencies dry friction damper has a mitigating effect on performance. In order to overcome this problem, original system parameters are modified. In the modified system a softer mount that increase vibration isolation performance at high frequencies
but, which might cause excessive static deflection due to reduced stiffness of the system is used. On the other hand, addition of dry friction damping prevents excessive static deflections due to the increased stiffness effect and also increases the performance at high frequencies due to the soft mount. Final results showed that vibration isolation performance at low frequencies increases considerably while vibration isolation performance at high frequency is similar and even slightly better than the original system with addition of dry friction damping.
7
Mastricola, Nicholas Palma. "Nonlinear Stiffness and Edge Friction Characterization of Coned Disk Springs." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480346443676492.
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Dupeux, Guillaume. "Propulsion et friction d'objets non mouillants." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://pastel.archives-ouvertes.fr/pastel-00954334.
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Nous nous intéressons aux dynamiques spéciales engendrées par des objets non mouillants. Sur un substrat recouvert de rainures asymétriques en dents de scie, un liquide ou un solide en caléfaction est propulsé horizontalement. Les motifs rectifient l'écoulement de vapeur dans une direction privilégiée et le mobile est entrainé par viscosité. Sur un substrat lisse, si le solide est lui-même asymétrique, la répartition non homogène de masse incline la surface inférieure et avec elle la force de pression de l'écoulement de vapeur : sa composante horizontale met aussi l'objet en mouvement. Une goutte caléfiée entre deux plans parallèles montre également un comportement surprenant : au-delà d'un rayon critique, elle se déstabilise en formant un anneau qui s'agrandit et éclate en petits fragments. La grande mobilité de ces objets pose la question de la friction qu'ils subissent. Très faible sur un substrat lisse, on observe une dissipation inertielle dans l'air environnant et dans une couche limite liquide pour les gouttes. En revanche, sur un substrat crénelé, elle est fortement amplifiée par l'impact du liquide sur les textures. Pour terminer, nous nous intéressons à divers objets non mouillants naturels : l'argyronète aquatique et plusieurs plantes aquatiques superhydrophobes. Le premier est une araignée qui passe sa vie sous l'eau. Elle s'abrite dans une grande bulle d'air qu'elle crée en capturant, par un mouvement dynamique de son abdomen superhydrophobe et de ses pattes, de petites bulles à la surface de l'eau. Quant aux seconds, ils utilisent leurs surfaces non mouillantes pour survivre lors d'une immersion.
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Thaijaroen, Woothichai. "Nonlinear dynamic modelling of rubber isolators using six parameters based on parabolic spring, springpot, and smooth-slip friction element." Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492630.
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A time-domain six-parameter model is adopted to simulate the vibration behaviour of various rubber-isolators at constant temperature and preload over the frequency range of 0.05-25 Hz. The model consists of three components based on a nonlinear parabolic spring, a fractional-derivative-based springpot, and a smooth-slip friction element. The adopted mode working in one-dimensional manner is capable of generating force as a function of displacement.
10
Dueñas, Osorio Leonardo Augusto 1976. "Optimization of base isolation systems using low-cost bearings and frictional devices." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/84275.
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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.Vita.
Includes bibliographical references (leaves 52-53).
by Leonardo Augusto Dueñas Osorio.
M.Eng.
Books on the topic "Friction isolator"
1
Aguiar, Mark, and Manuel Amador. The Economics of Sovereign Debt and Default. Princeton University Press, 2021. http://dx.doi.org/10.23943/princeton/9780691176819.001.0001.
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Fiscal crises and sovereign default repeatedly threaten the stability and growth of economies around the world. This book provides a unified and tractable theoretical framework that elucidates the key economics behind sovereign debt markets, shedding light on the frictions and inefficiencies that prevent the smooth functioning of these markets, and proposing sensible approaches to sovereign debt management. The book looks at the core friction unique to sovereign debt—the lack of strong legal enforcement—and goes on to examine additional frictions such as deadweight costs of default, vulnerability to runs, the incentive to “dilute” existing creditors, and sovereign debt's distortion of investment and growth. It uses the tractable framework to isolate how each additional friction affects the equilibrium outcome, and illustrates its counterpart using state-of-the-art computational modeling. The novel approach presented here contrasts the outcome of a constrained efficient allocation—one chosen to maximize the joint surplus of creditors and government—with the competitive equilibrium outcome. This allows for a clear analysis of the extent to which equilibrium prices efficiently guide the government's debt and default decisions, and of what drives divergences with the efficient outcome. Providing an integrated approach to sovereign debt and default, the book is an ideal resource for researchers and graduate students interested in this important topic.
2
Heithaus, Robert Evans, Almas Syed, and Chet R. Rees. Slow and Steady Method for Advancing Devices Through Tight or Tortuous Anatomy. Edited by S. Lowell Kahn, Bulent Arslan, and Abdulrahman Masrani. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199986071.003.0059.
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Advancing vascular sheaths, catheters, balloons, stent grafts, or drainage catheters can prove difficult in tight or tortuous anatomy, leading to prolonged procedure and fluoroscopy time. Overcoming the static forces of friction requires greater magnitude of force compared to the kinetic forces of friction. Static forces of friction can result in catheter or device kinking, particularly in tight or tortuous anatomy. By applying slow, steady force (as opposed to multiple isolated applications of force) in a manner described in this chapter, one can advance a device in a slow and steady manner, thus reducing the amount of pain, tissue damage, and potentially fluoroscopy time.
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Kapal, Rishi. Managing Large Teams: Overcoming Skip- Level Frictions and Executive Isolation. SAGE Publications India Pvt, Ltd., 2021.
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4
Lei, Kai-ming. Response of equipment in resilient-friction base isolated structures subjected to ground motion. 1992.
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Bolt, Paul J., and Sharyl N. Cross. The Sino–Russian Strategic Partnership. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198719519.003.0006.
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The Conclusion reviews the volume’s major themes. Russia and China have common interests that cement their partnership, and are key players in shaping the international order. Both seek better relations with the West, but on the basis of “mutual respect” and “equality.” While the relationship has grown deeper, particularly since 2014, China and Russia are partners but not allies. Thus, their relationship is marked by burgeoning cooperation, but still areas of potential competition and friction. Russia in particular must deal with China’s growing relative power at the same time that it is isolated from the West. While the Russian–Chinese relationship creates challenges for the United States and Europe and a return of major power rivalry, there is also room for cooperation in the strategic triangle comprising China, Russia, and the West. Looking ahead, the world is in a period of dramatic transition.
Book chapters on the topic "Friction isolator"
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Sodha, Ankit, Sandip A. Vasanwala, and Devesh Soni. "Probabilistic Evaluation of Seismically Isolated Building Using Quintuple Friction Pendulum Isolator." In Advances in Intelligent Systems and Computing, 149–59. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1966-2_13.
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Tan, Ping, Jiying Shang, Jianping Han, Kui Yang, and Yafei Zhang. "Experimental and Analytical Investigation of Variable Curvature and Friction Pendulum Isolator." In Lecture Notes in Civil Engineering, 217–28. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-21187-4_16.
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Althaf Hyder, P. R., and E. K. Amritha. "Seismic Analysis of Steel Diagrid Structures Using Triple Friction Pendulum Isolator (TFP)." In Lecture Notes in Civil Engineering, 633–44. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-26365-2_59.
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Saha, Purnachandra. "Seismic Control of Benchmark Cable-Stayed Bridges Using Variable Friction Pendulum Isolator." In Advances in Structural Engineering, 1271–82. New Delhi: Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-2193-7_99.
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Sen, Pratik, and Purnachandra Saha. "Seismic Performance of Polynomial Friction Pendulum Isolator (PFPI) on Benchmark Cable-Stayed Bridge." In Recent Developments in Sustainable Infrastructure, 187–200. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4577-1_15.
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Zhelyazov, Todor. "Analytical Modeling of the Thermo-Mechanical Behavior of a Friction-Pendulum Seismic Isolator." In Structural Integrity, 170–71. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47883-4_32.
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Ao, Hong Rui, Hong Yuan Jiang, and A. M. Ulanov. "Estimation of the Fatigue Lifetime of Metal Rubber Isolator with Dry Friction Damping." In Experimental Mechanics in Nano and Biotechnology, 949–52. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-415-4.949.
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Wang, X., C. Marsh, and A. Pall. "Studies on friction base isolators." In Earthquake Engineering, edited by Shamim A. Sheikh and S. M. Uzumeri, 359–66. Toronto: University of Toronto Press, 1991. http://dx.doi.org/10.3138/9781487583217-046.
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Bianco, V., G. Monti, and N. P. Belfiore. "Mechanical Modelling of Friction Pendulum Isolation Devices." In Lecture Notes in Civil Engineering, 133–46. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78936-1_10.
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Nijkamp, P., and K. Spiess. "International Migration in Europe: Overcoming Isolation and Distance Friction." In Advances in Spatial Science, 83–102. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79827-6_7.
Full textConference papers on the topic "Friction isolator"
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Tsai, C. S., Jeng-Wen Lin, Yung-Chang Lin, and Chia-Chi Chen. "Applications of Multiple Trench Friction Pendulum System to Seismic Mitigation of Structures." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61344.
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In order to promote seismic resistance capability of structures and simplify the manufacturing processes of an isolator, a new base isolation system called the multiple trench friction pendulum system (MTFPS) is proposed. The investigations for the proposed isolator have been carried out to address its mechanical characteristics and to assess its performance in seismic mitigation through a series of shaking table tests in this study. The MTFPS isolator can provide different natural periods, displacement capacities and damping effects in any two independent directions. The natural period and damping effect for a MTFPS isolator change continually during earthquakes. Results from the shaking table tests on a scaled three-story structure isolated with MTFPS isolators illustrate that the proposed MTFPS isolator can isolate most earthquake induced energy and provide good protection for structures from earthquake damage. In addition, the mathematical formulations for the MTFPS isolator have also been derived to examine its characteristics.
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Tsai, C. S., Po-Ching Lu, and Wen-Shin Chen. "Shaking Table Tests of a Building Isolated With Trench Friction Pendulum System." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93253.
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It has been proven that the seismic isolation technology is a very promising tool to lessen damage caused by earthquakes. In order to provide a cheap and efficient base isolator for engineering practice, a new isolator named the trench friction pendulum system (TFPS), which is easy to design and manufacture, is proposed in this study. A series of shaking table tests of a scaled steel structure equipped with TFPS isolators were performed in the Department of Civil Engineering, Feng Chia University, Taichung, Taiwan. Experimental results demonstrate that the TFPS isolator can isolate most of earthquake induced energy trying to impart into the superstructure and that the device is not only cheap but also efficient for seismic mitigation.
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Tsai, C. S., Yung-Chang Lin, H. C. Su, and Ya-Fang Tseng. "Nonlinear Analyses of a Building Isolated With Multiple Trench Friction Pendulum System Under Multi-Directional Excitations." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25594.
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The multiple trench friction pendulum system (MTFPS) which has numerous sliding interfaces in each of two perpendicular directions can provide different natural periods, displacement capacities and damping effects at various levels of displacements in the individual direction. In order to characterize the mechanical behavior of the MTFPS isolator under multi-directional earthquakes, a plasticity model named as the multiple yield and bounding surfaces model is proposed in this study. Investigations for buildings isolated with TFPS isolators and subjected to multi-directional excitations have been carried out to assess the performance of the MTFPS isolation bearing in seismic mitigation through numerical analyses. Results from numerical analyses illustrate that the MTFPS isolation bearing can isolate most earthquake induced energy and provide good protection for structures from earthquake damage.
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Tsai, C. S., Yung-Chang Lin, and H. C. Su. "Seismic Responses of a Building Isolated With Multiple Friction Pendulum System Subjected to Multi-Directional Excitations." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25587.
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In order to prevent a building from earthquake damage, a base isolation system called the multiple friction pendulum system (MFPS) which has numerous concave sliding interfaces is proposed to isolate a building from its foundation. Mathematical formulations have been derived to simulate the characteristic of the MFPS isolation system subjected to multi-directional excitations. By virtue of the derived mathematical formulations, the phenomena of the sliding motions of the MFPS isolator with several concave sliding interfaces under multi-directional earthquakes can be clearly understood. Also, numerical analyses of a building isolated with the MFPS isolator with several sliding interfaces have been conducted in this study to evaluate the efficiency of the proposed system in seismic mitigation. It has been proved through numerical analyses that structural responses have been reduced significantly and that the proposed system is a good tool to insure the safety of structures during earthquakes.
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Tsai, C. S., Wen-Shin Chen, T. C. Chiang, and Yung-Chang Lin. "Application of Direction Optimized-Friction Pendulum System to Seismic Mitigation of Sensitive Equipment." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26552.
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In the recent years, earthquake proof devices have been used to promote the earthquake resistant capabilities of many structures and public constructions. In addition, the high-tech industries are an important key to economic development in some earthquake prone areas, and many historical relics are also located in these areas. Therefore, how to protect the critical equipments from earthquake damage is an important issue. Among many control devices, sliding type isolators such as the FPS, MFPS and TFPS, ect. Isolators are used to lengthen the natural periods of equipment, and to isolate the seismic energy trying to impart to structures. However, the frequency and displacement capacity have been predefined when the radius of curvature of the concave surface or stiffness of base isolator is once determined. In this study, the base isolator with variable frequencies and displacement capacities has been proposed, and several shaking table tests of critical sensitive equipment with the proposed isolators have been carried out in Feng Chia University. The experimental results illustrated that the most responses of tested equipment have been reduced during earthquake.
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Tsai, C. S., Tsu-Cheng Chiang, and Bo-Jen Chen. "Seismic Behavior of MFPS Isolated Structure Under Near-Fault Sources and Strong Ground Motions With Long Predominant Periods." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-2104.
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Base isolation, which has been recognized as a very promising way for upgrading the earthquake-proof capability of existing structures both from theoretical and experimental studies. However, some researchers suspect the efficiency of base isolator under near-fault earthquakes and strong ground motions with long predominant periods. It is suggested from previous studies that earthquakes with long predominant periods always cause severe responses of base-isolated structures. In view of this, a new base isolator called as Multiple-Friction Pendulum System (MFPS) has been proposed in this study to improve the shortcoming of those undesirable phenomenon of base-isolated structures. In order to evaluate the efficiency of MFPS isolators, the shaking table tests of a 3-story steel structure have been performed at NCREE in Taiwan. Experimental results show that the proposed isolator still posses well performance under near source excitations and strong ground motions with long period predominant periods. Therefore, the proposed base isolator can be recognized as a very promising tool for enhancing the seismic-resistance of a structure near seismic faults or on a soft deposit soil.
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Marenda, Ivan, Agostino Marioni, Roberto Dalpedri, and Marco Banfi. "Dynamic properties of the isolators used in the Green Museum Library (Taiwan)." In IABSE Congress, Ghent 2021: Structural Engineering for Future Societal Needs. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.0293.
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<p>Over the last decades seismic isolation technology has got a foothold in the structural protection increasing both the damping and the natural period of the superstructure. The curved surface sliding isolator is one of the most common devices used to aim at this goal. It features a special friction material (HIM) able to dissipate a very large amount of energy while, the recentring capacity is given by the pendulum effect. This kind of isolator has been used in the Green Museum Palace (Taiwan). The constancy of its behaviour has been investigated in ShakeLab (Italy), testing 100% of the Friction Pendulum devices in factory production control. In this paper, response data from FPC tests on seven types of Friction Pendulum devices are illustrated. These data show the constancy of the performance of the isolators subjected to design conditions. Furthermore, scale effect in dynamic properties has been studied because of different size isolators have been taken into account.</p>
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Mikoshiba, Tadashi, Chikahiro Minowa, Masakazu Terai, Takanori Sato, Yoshihiro Maruyama, and Toshio Chiba. "Development of Base-Isolation House Using Sliding Device." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25150.
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By setting the isolation system between the foundation of the house and the foundation ground, it makes it possible to scale back the influence of the earthquake. A sliding isolator, which is compact and has stable isolation characteristics, had been developed. It was made of a plate with multi convex cell and a sliding plate. This system is a sliding isolator with multipoint contact. The static tests, the shaking table tests and analysis were conducted to confirm the damping capacity of the sliding device. In the element tests, the coefficient of static and dynamic friction and the change in the friction of the total system resulting from construction error were investigated. Movement of the base-isolated house and twisting of the base-isolated house with eccentric load under the actual earthquake loading were surveyed in the shaking table tests. As a result, it was effective and had a stable performance.
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Tsai, C. S., T. C. Chiang, and Wen-Shin Chen. "Finite Element Formulations for Direction Optimized-Variable Curvature Friction Pendulum System." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26555.
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The base isolation technology has been recognized as a very effective tool for controlling the seismic response of a structure during earthquakes. However, it is suggested from recent studies that the earthquakes with long predominant periods results in significant seismic responses of the base isolated structure. In view of this, a new base isolator called the Directional Optimized-Variable Curvature Friction Pendulum System (DO-VCFPS) has been proposed in this study. The radii of the curvature of the trench concave surface and the spherical sliding surface are lengthened with increasing the sliding displacement. Therefore, the isolation period can be shifted further away from the predominant periods of ground motions. Furthermore, by using the series connection of a trench concave surface and a spherical sliding surface, the isolation period is a function of the angle between the directions of the resultant displacement. In order to prove the efficiency of the proposed device, the finite element formulations of the DOVCFPS have been derived in this study. The numerical results show that the combination of the advantages of the Variable Curvature Friction Pendulum System (VCFPS) and the Directional Optimization Friction Pendulum System (DO-FPS) can improve the disadvantages of a base isolated structure with fixed isolation period.
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Paolacci, Fabrizio. "On the Effectiveness of Two Isolation Systems for the Seismic Protection of Elevated Tanks." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28563.
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This paper deals with the effectiveness of two isolation system for the seismic protection of elevated steel storage tanks. In particular the performance of High Damping Rubber Bearings and Friction Pendulum isolators has been analyzed. As case study an emblematic example of elevated tanks collapsed during the Koaceli Earthquake in 1999 at Habas Pharmaceutics plant in Turkey has been considered. A time-history analysis conducted using lumped mass models demonstrated the high demand in terms of base shear required to the support columns and their inevitable collapse due to the insufficient shear strength. A proper design of HDRB and FPS isolator and a complete non-linear analysis of the isolated tanks proved the high effectiveness of both isolation systems in reducing the response of the case tank. Actually, a reduced level of displacements of isolators and a reduced level of convective base shear obtained with the second isolation typology, suggested the used of FPS isolators rather than HDRB.
Reports on the topic "Friction isolator"
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Wu, Yingjie, Selim Gunay, and Khalid Mosalam. Hybrid Simulations for the Seismic Evaluation of Resilient Highway Bridge Systems. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, November 2020. http://dx.doi.org/10.55461/ytgv8834.
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Bridges often serve as key links in local and national transportation networks. Bridge closures can result in severe costs, not only in the form of repair or replacement, but also in the form of economic losses related to medium- and long-term interruption of businesses and disruption to surrounding communities. In addition, continuous functionality of bridges is very important after any seismic event for emergency response and recovery purposes. Considering the importance of these structures, the associated structural design philosophy is shifting from collapse prevention to maintaining functionality in the aftermath of moderate to strong earthquakes, referred to as “resiliency” in earthquake engineering research. Moreover, the associated construction philosophy is being modernized with the utilization of accelerated bridge construction (ABC) techniques, which strive to reduce the impact of construction on traffic, society, economy and on-site safety. This report presents two bridge systems that target the aforementioned issues. A study that combined numerical and experimental research was undertaken to characterize the seismic performance of these bridge systems. The first part of the study focuses on the structural system-level response of highway bridges that incorporate a class of innovative connecting devices called the “V-connector,”, which can be used to connect two components in a structural system, e.g., the column and the bridge deck, or the column and its foundation. This device, designed by ACII, Inc., results in an isolation surface at the connection plane via a connector rod placed in a V-shaped tube that is embedded into the concrete. Energy dissipation is provided by friction between a special washer located around the V-shaped tube and a top plate. Because of the period elongation due to the isolation layer and the limited amount of force transferred by the relatively flexible connector rod, bridge columns are protected from experiencing damage, thus leading to improved seismic behavior. The V-connector system also facilitates the ABC by allowing on-site assembly of prefabricated structural parts including those of the V-connector. A single-column, two-span highway bridge located in Northern California was used for the proof-of-concept of the proposed V-connector protective system. The V-connector was designed to result in an elastic bridge response based on nonlinear dynamic analyses of the bridge model with the V-connector. Accordingly, a one-third scale V-connector was fabricated based on a set of selected design parameters. A quasi-static cyclic test was first conducted to characterize the force-displacement relationship of the V-connector, followed by a hybrid simulation (HS) test in the longitudinal direction of the bridge to verify the intended linear elastic response of the bridge system. In the HS test, all bridge components were analytically modeled except for the V-connector, which was simulated as the experimental substructure in a specially designed and constructed test setup. Linear elastic bridge response was confirmed according to the HS results. The response of the bridge with the V-connector was compared against that of the as-built bridge without the V-connector, which experienced significant column damage. These results justified the effectiveness of this innovative device. The second part of the study presents the HS test conducted on a one-third scale two-column bridge bent with self-centering columns (broadly defined as “resilient columns” in this study) to reduce (or ultimately eliminate) any residual drifts. The comparison of the HS test with a previously conducted shaking table test on an identical bridge bent is one of the highlights of this study. The concept of resiliency was incorporated in the design of the bridge bent columns characterized by a well-balanced combination of self-centering, rocking, and energy-dissipating mechanisms. This combination is expected to lead to minimum damage and low levels of residual drifts. The ABC is achieved by utilizing precast columns and end members (cap beam and foundation) through an innovative socket connection. In order to conduct the HS test, a new hybrid simulation system (HSS) was developed, utilizing commonly available software and hardware components in most structural laboratories including: a computational platform using Matlab/Simulink [MathWorks 2015], an interface hardware/software platform dSPACE [2017], and MTS controllers and data acquisition (DAQ) system for the utilized actuators and sensors. Proper operation of the HSS was verified using a trial run without the test specimen before the actual HS test. In the conducted HS test, the two-column bridge bent was simulated as the experimental substructure while modeling the horizontal and vertical inertia masses and corresponding mass proportional damping in the computer. The same ground motions from the shaking table test, consisting of one horizontal component and the vertical component, were applied as input excitations to the equations of motion in the HS. Good matching was obtained between the shaking table and the HS test results, demonstrating the appropriateness of the defined governing equations of motion and the employed damping model, in addition to the reliability of the developed HSS with minimum simulation errors. The small residual drifts and the minimum level of structural damage at large peak drift levels demonstrated the superior seismic response of the innovative design of the bridge bent with self-centering columns. The reliability of the developed HS approach motivated performing a follow-up HS study focusing on the transverse direction of the bridge, where the entire two-span bridge deck and its abutments represented the computational substructure, while the two-column bridge bent was the physical substructure. This investigation was effective in shedding light on the system-level performance of the entire bridge system that incorporated innovative bridge bent design beyond what can be achieved via shaking table tests, which are usually limited by large-scale bridge system testing capacities.
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Friction Pendulum™ - Seismic Isolation Bearings. Purdue University, 2007. http://dx.doi.org/10.5703/1288284315802.
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