Optimum frictional elements in sliding isolation systems

Jangid, R. S.

doi:10.1016/s0045-7949(99)00126-1

Cited by 62 publications

(22 citation statements)

References 14 publications

(29 reference statements)

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“…The different influence of the three soil conditions and, in particular, the increase of the statistics values of the response parameters from stiff to soft soil condition results to be consistent with the results described in [28]- [30]. The existence of an optimal value of the friction coefficient has been pointed out in many studies on systems isolated by FPS bearings [17], [21]- [24], [26] and it depends on some effects that follow an increase of the friction coefficient. In fact, an increase of the friction coefficient leads to an increase of the isolator strength (and thus of the equivalent stiffness, with a reduction of the corresponding effective fundamental vibration period (Fig.1)) and the increase of participation of higher vibration modes as well as transfer of forces towards the superstructure.…”

Section: Parametric Study Resultssupporting

confidence: 88%

“…Bucher [25] proposed a reliability-based design approach for the bearings accounting for the probabilistic performance properties in terms of maximum and residual isolator displacements, and the maximum interstorey structural displacement. Jangid [21]- [22], considering a stochastic model of the earthquake ground motion, evaluated the seismic performance of a single shear type building isolated by FPS bearings whose behavior was described by a Coulomb model showing that there exists an optimal value of the friction coefficient for which the top floor absolute acceleration of the building is minimized. This value is influenced by the building properties and the isolation period, and it increases with the increase of the earthquake intensity.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Friction Coefficients for Isolated Structures Depending on the Soil Condition

Castaldo¹,

Ripani²

2017

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

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Section: Parametric Study Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Optimal Friction Coefficients for Isolated Structures Depending on the Soil Condition

Castaldo¹,

Ripani²

2017

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

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“…Several investigations have been performed to identify slider behavior in seismic conditions. An overview on some of the most interesting contributions is reported in Mokha et al [1990], Constantinou et al [1990], Makris and Chang [2000], Jangid [2000], Higashino et al [2003], and Dolce et al [2005]. Proposals of isolation systems based on sliding bearing together with other lateral restraining elements were presented in Constantinou et al [1991], Bondonet and Filiatrault [1997], Cardone et al [2003], and Dolce et al [2007a,b].…”

Section: Flat Slider Devicementioning

confidence: 99%

Innovative Superelastic Isolation Device

Attanasi¹,

Auricchio²

2011

Journal of Earthquake Engineering

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The objective of the present work is to propose a new seismic isolation device based on superelastic material components manufactured using shape memory alloys. Seismic isolation is one of the most effective options for the passive protection of structures. Shape memory alloys (SMAs) are characterized by unique mechanical properties due to a solid-solid transformation. An isolation bearing system based on a SMA superelastic effect is intended to provide nonlinear flag-shaped lateral displacement-shear force hysteresis, additional damping, and recentering properties to reduce or eliminate the residual deformations.The device concept is based on two separate systems, one to transmit the vertical load and another to act as a lateral restrainer. This article presents in detail the mechanical components of the innovative device focusing on its main properties.The system theoretical response is computed, resulting very attractive from the earthquake engineering point of view, because of its capability in reaching the design goals, i.e., modification of the structural response, ability to undergo large displacement demand without loss of strength, energy dissipation, and recentering after the seismic event.

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“…In the recent years, increasing research efforts have been devoted to the search of the optimal properties of FP systems. The earliest works employed equivalent spring and damper models to describe the isolation bearing behavior [14]- [15]. Other studies have introduced more advanced models including bi-linear hysteretic ones or models accounting for variation of friction to represent the FP bearings [16]- [20].…”

Section: Introductionmentioning

confidence: 99%

Influence of ground motion characteristics on the optimal single concave sliding bearing properties for base-isolated structures

Castaldo

Tubaldi

2018

Soil Dynamics and Earthquake Engineering

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This study examines the influence of ground motion characteristics on the optimal friction properties of single concave sliding bearings employed for the seismic isolation of structural systems. The evaluation of the optimal properties is carried out by considering a non-dimensional formulation which employs the peak ground acceleration (PGA) and the peak ground acceleration-to-velocity (PGA/PGV) ratio as ground motion parameters. A two-degree-of-freedom (2dof) model is employed to describe the isolated system and two different families of records representative respectively of near fault and far field seismic inputs are considered. Following the nondimensionalization of the equation of motion for the proposed ground motion parameters, it is shown that the non-dimensional responses obtained for the two types of seismic inputs are similar. This result confirms that PGA/PGV is a good indicator of the frequency content and of other characteristics of ground motion records, helping to reduce the scatter in the response. Regression expressions are also obtained for the optimal values of the friction coefficient that minimizes the superstructure displacements relative to the base as a function of the abovementioned ground motion parameter and of the dimensionless system parameters. These expressions can be used for the preliminary estimation of the optimal properties of isolation bearings with a single concave sliding surface or double concave sliding surfaces with equal friction coefficient

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Optimum frictional elements in sliding isolation systems

Cited by 62 publications

References 14 publications

Optimal Friction Coefficients for Isolated Structures Depending on the Soil Condition

Optimal Friction Coefficients for Isolated Structures Depending on the Soil Condition

Innovative Superelastic Isolation Device

Influence of ground motion characteristics on the optimal single concave sliding bearing properties for base-isolated structures

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