Response of the Double Variable Frequency Pendulum Isolator under Triaxial Ground Excitations

Panchal, V. R.; Jangid, R. S.; Soni, Devesh P.; Mistry, Bharat

doi:10.1080/13632460903294390

Cited by 22 publications

(3 citation statements)

References 23 publications

(33 reference statements)

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“…Besides concave sliding surface designs, Lu et al [15] and Saha et al [16] analytically and experimentally studied some complicated polynomial functions designed for the sliding surfaces of FPBs so as to present variable stiffness properties and thus achieve multiple design objectives. Furthermore, in addition to studying the unilateral behavior of double or triple FPBs, their multi-axial behavior was thoroughly studied by Panchal et al [17], Becker and Mahin [18], Sah and Soni [19], and Furinghetti et al [20]. Some research results indicated that the effect arising from vertical excitations on the horizontal seismic performance of double or triple FPBs might not be negligible for obtaining more accurate and conservative design results [21,22].…”

Section: Literature Reviewmentioning

confidence: 99%

Control Performances of Friction Pendulum and Sloped Rolling-Type Bearings Designed with Single Parameters

et al. 2020

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Owing to quite different features and hysteretic behavior of friction pendulum bearings (FPBs) and sloped rolling-type bearings (SRBs), their control performances might not be readily compared without some rules. In this study, first, on the premise of retaining the same horizontal acceleration control performance, the effects arising from different sloping angles and damping forces on the horizontal maximum and residual displacement responses of SRBs are numerically examined. For objective comparison of passive control performances of FPBs and SRBs, then, some criteria are considered to design FPBs with the same horizontal acceleration control performance by referring to the designed damping force and the maximum horizontal displacement response of SRBs under a given seismic demand. Based on the considered criteria, the passive control performances of FPBs and SRBs under a large number of far-field and pulse-like near-fault ground motions are quantitatively compared. The numerical comparison results indicate that the FPB models might potentially have better horizontal acceleration and isolation displacement control performances than the SRB models regardless of whether they are subjected to far-field or near-fault ground motions, while the opposite tendency is observed for their self-centering performances, especially when the SRB model designed with a larger sloping angle or a smaller damping force.

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Section: Literature Reviewmentioning

confidence: 99%

Control Performances of Friction Pendulum and Sloped Rolling-Type Bearings Designed with Single Parameters

et al. 2020

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“…A new material, shape memory alloy (SMA), has been utilized in the rubber bearings to limit the displacement and provide the energy dissipation [23][24][25][26][27], but less investigation has been carried out on the VFPI. Additionally, due to the complex of the sliding geometry of the VFPI, the contact between the slider and surface may result in tear and local damage due to stress concentration [28]. The design compressive stress of the commonly used polytetrafluoroethylene (PTFE) plate is only 30 Mpa [29].…”

Section: Introductionmentioning

confidence: 99%

Multiple-variable frequency pendulum isolator with high-performance materials

Han

Wen

et al. 2020

Smart Mater. Struct.

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The spherical surface of the friction pendulum system (FPS) inevitably introduce a constant dominant period, which may lead to resonance problem when subjected to the ground motions with long-period components. In this study, a multiple-variable frequency pendulum isolator (MVFPI) was developed to overcome this limitation. The sliding surface of the MVFPI was predefined as a continuous piecewise function to combine the seismic performance of MVFPI with different seismic intensities. The high-performance materials, polytetrafluoroethylene (PTFE) fabric and shape memory alloy (SMA) were utilized to improve its durability and control the deformation. Based on the underlying principles of operation, the force-displacement relationships of the MVFPI were derived. A series of tests of high-performance materials and MVFPI were conducted to verify the accuracy of the derived hysteresis model. Parametric studies and optimal analysis were carried out on the critical parameters of the MVFPI. The results indicate that the MVFPI has the desired hysteretic behavior as prescribed by the derived formulas. Moreover, the seismic responses of the structure isolated by MVFPI with optimal parameters could be controlled within the desired range.

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“…In the past, analytical studies have reported an increase of several response parameters of structures isolated with friction bearings subjected to 3D excitation in comparison with 2D. 20,21 The strong coupling evidence in the TPB configuration was shown to result from the friction mechanism in the bearings. 22 However, the H-V coupling observed in the LRB/CLB and fixed-base configurations has not yet been fully explained.…”

mentioning

confidence: 99%

Computational simulation of slab vibration and horizontal‐vertical coupling in a full‐scale test bed subjected to 3D shaking at E‐Defense

Pujols

Ryan

2017

Earthq Engng Struct Dyn

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Summary This paper focuses on slab vibration and a horizontal‐vertical coupling effect observed in a full‐scale 5‐story moment frame test bed building in 2 configurations: isolated with a hybrid combination of lead‐rubber bearings and cross‐linear (rolling) bearings, and fixed at the base. Median peak slab vibrations were amplified—relative to the peak vertical shake table accelerations—by factors ranging from 2 at the second floor to 7 at the roof, and horizontal floor accelerations were significantly amplified during 3D (combined horizontal and vertical) motions compared with 2D (horizontal only) motions of comparable input intensity. The experimentally observed slab accelerations and the horizontal‐vertical coupling effect were simulated through a 3D model of the specimen using standard software and modeling assumptions. The floor system was modeled with frame elements for beams/girders and shell elements for floor slabs; the insertion point method with end joint offsets was used to represent the floor system composite behavior, and floor mass was finely distributed through element discretization. The coupling behavior was partially attributed to the asymmetry of the building that was intensified by asymmetrically configured supplemental mass at the roof. Horizontal‐vertical coupled modes were identified through modal analysis and verified with evaluation of floor spectral peaks.

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Response of the Double Variable Frequency Pendulum Isolator under Triaxial Ground Excitations

Cited by 22 publications

References 23 publications

Control Performances of Friction Pendulum and Sloped Rolling-Type Bearings Designed with Single Parameters

Control Performances of Friction Pendulum and Sloped Rolling-Type Bearings Designed with Single Parameters

Multiple-variable frequency pendulum isolator with high-performance materials

Computational simulation of slab vibration and horizontal‐vertical coupling in a full‐scale test bed subjected to 3D shaking at E‐Defense

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