Experimental evaluation of extra-stroke displacement capacity for Curved Surface Slider devices

Furinghetti, Marco; Yang, Tianye; Calvi, Paolo M.; Pavese, Alberto

doi:10.1016/j.soildyn.2021.106752

Cited by 41 publications

(17 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…32 As part of a comprehensive study on several building typologies and site hazards, Iervolino et al 21 noted that isolated structures may have a worse collapse risk performance than non-isolated structures. These conclusions may be due to a seemingly conservative definition of collapse used for the bearing devices since other research 33 has shown that isolators can generally go far past the collapse displacement used in that previous study. However, more specific research that accounted for the failure mechanism in bearings by Kitayama and Constantinou 30 has also illustrated how minimum code-based designs for seismically isolated buildings in the US can have unacceptable collapse performance at the maximum considered earthquake intensity, which aligns with Iervolino et al 21 Kitayama and Constantinou also show 20 that when examining the isolated structures via a detailed probabilistic assessment, the annual exceedance rates of storey drifts and floor accelerations prior to collapse are still lower than the corresponding non-isolated structure.…”

Section: Introductionmentioning

confidence: 73%

Risk‐based seismic design of base‐isolated structures with single surface friction sliders

O’Reilly

Yagi

Suzuki

et al. 2022

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

Choosing friction pendulum isolators to avoid problems with device displacement capacity or boundary wall collision is a critical part of the seismic design of base isolation systems. This paper developed a probabilistic method to quantify the risk of failure in single friction pendulum bearing (FPB) devices. This was done by calibrating a demand-intensity model for FPBs from numerical analysis for several device property combinations. These properties encompassed the dynamic friction coefficient and effective radius of curvature-key parameters impacting these FPB devices' seismic response. Through this demand-intensity model, a closed-form and relatively simple approach to quantify the mean annual frequency of exceeding a given device displacement threshold, or risk of failure, was proposed. By applying this simplified method to several case study structures and comparing it with a more extensive assessment involving multiple stripe analysis (MSA) using hazard-consistent ground motions, the proposed simplified approach could provide very accurate estimates of displacement-based failure risk in FPB devices under the assumption of no non-linear behaviour in the superstructure. This proposed approach implies that structural engineers can now quickly assess the actual failure rates of different FPB device combinations used in practice to give a more uniform level of safety or reliability when designing and assessing FPB-isolated systems. It is also arguably much simpler, direct and accurate than currently available code-based approaches.

show abstract

Section: Introductionmentioning

confidence: 73%

Risk‐based seismic design of base‐isolated structures with single surface friction sliders

O’Reilly

Yagi

Suzuki

et al. 2022

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…Since the overall system is supposed to be subjected to a sever seismic input, and consequently the design displacement of the isolation system is expected to be overcome, the extra-stroke behavior needs to be numerically modeled. Recent research works ( [6], [8]) have shown good agreement between some experimental outcomes pseudo-dynamic tests in extra-stroke range for DCSS devices and possible numerical modeling strategies, namely:…”

Section: Numerical Substructure and Dynamic Systemmentioning

confidence: 83%

“…In addition, the sliding surface of the pad has been realized with dimpled recesses, with a light lubrication, in order to achieve the proper design friction coefficient, equal to 3% ( [4]); the corresponding value of applied vertical load is equal to 1500kN.The maximum displacement, given the assumed plan geometric characteristics of sliding surfaces and internal slider, is equal to 172mm. In order to consider a significant extra-stroke displacement demand, the maximum displacement to be considered for the simulation, which will define the proper scaling of the input signal, is defined according to the design value, increased by 50% of the sliding pad diameter, so that 25% of the pad is uncovered by each sliding surface ( [6]). Thus, a maximum displacement of 350mm has been considered.…”

Section: Characteristics Of the Physical Devicementioning

confidence: 99%

Modeling Strategies for the Lateral Response of Curved Surface Slider Devices Under Extreme Displacement Demands

Furinghetti¹,

Pavese²

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

Self Cite

View full text Add to dashboard Cite

Base isolation represents one of the most efficient strategy for the reduction of the structural vulnerability of buildings and bridges. Design procedures generally aim to provide the proper period shift, in order to reduce spectral acceleration values and, consequently, the base shear and internal forces. On the other hand, high displacement demands can be achieved, which can be partially limited by providing dissipative capacity through hysteretic behaviors. Although design procedures allow to fairly estimate the design displacement of the adopted devices, extreme seismic event can occur, and displacement higher than the design value can be experienced. Especially for Curved Surface Slider devices, if the displacement demand exceeds a certain geometrical limit, non-negligible damage can occur at the sliding pad, and variations in the force response are consequently noticed. In this work modeling strategies for the computation of the seismic response of base-isolated buildings are presented, by considering extreme earthquake loading conditions. Analytical models are reported for Curved Surface Slider devices, calibrated through the experimental outcomes of tests performed at the Laboratory of EUCENTRE Foundation in Pavia (Italy). In addition, simplified dynamic systems are defined, which allow fast assessments of the global response of a base-isolated structure, even though extreme seismic events are applied. Results have been compared to the response returned by an experimental hybrid simulation, in order to evaluate the accuracy of the presented dynamic systems.

show abstract

“…The exceedance of an isolator displacement corresponding to 90% of the isolator displacement capacity d=150mm was chosen to quantify the occurrence of damage in the seismic isolation system. Furinghetti et al [5] have experimentally evaluated and determined the extrastroke displacement capacity of curved surface slider devices, which is limited by the maximum contact pressure that can be tolerated by the installed sliding material. This extra-stroke displacement capacity was not considered in this study, but it can be further investigated by future studies on the same topic.…”

Section: Damage Typementioning

confidence: 99%

“…However, seismically isolated structures can be subjected to inelastic behavior and damage, when they are excited by earthquake ground motion with intensities exceeding the design seismic hazard level. Furthermore, seismically isolated structures can manifest inelastic behavior even for ground motion intensities corresponding to the design hazard level, when they are unintentionally constructed with lower strength than the value prescribed by the code provisions [4][5][6][7]. The investigation of such behavior of existing seismically isolated structures sheds light on their reliability and robustness compared to fixed-based structures, as defined by Castaldo et al [8,9], Tsang [10] and Peng et al [11].…”

Section: Introductionmentioning

confidence: 99%

Inelastic Response Modes of Seismically Isolated Structures: Failure of the Isolators or Damage in the Isolated Structure?

Tsiavos¹,

Markić²,

Schlatter³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

View full text Add to dashboard Cite

The goal of this study is to determine experimentally the inelastic response modes of seismically isolated structures. A steel specimen is designed and constructed to simulate the dynamic behavior of a Single-Degree-Of-Freedom (SDOF) system. The specimen is seismically isolated with four friction pendulum bearings and excited by a group of earthquake ground motion records using the shaking table of ETH Zurich Laboratory. A mechanical clevis connection consisting of two hinges and two replaceable steel coupons is designed and constructed to facilitate the parametric investigation of the inelastic response of the isolated structure for varying values of its strength. Two fundamentally different inelastic response modes have been observed during the excitation of the structure: A response mode dominated by large sliding displacement demand in the isolators and a response mode characterized by large displacement ductility demand in the isolated structure. This paper shows the effect of the design parameters of the isolation system and the isolated structure on the manifestation of these two response modes, thus paving the way for the understanding of the inelastic response of seismically isolated structures subjected to extreme earthquake ground motions.

show abstract

Experimental evaluation of extra-stroke displacement capacity for Curved Surface Slider devices

Cited by 41 publications

References 22 publications

Risk‐based seismic design of base‐isolated structures with single surface friction sliders

Risk‐based seismic design of base‐isolated structures with single surface friction sliders

Modeling Strategies for the Lateral Response of Curved Surface Slider Devices Under Extreme Displacement Demands

Inelastic Response Modes of Seismically Isolated Structures: Failure of the Isolators or Damage in the Isolated Structure?

Contact Info

Product

Resources

About