Effect of vertical component of earthquake on the response of pure-friction base-isolated asymmetric buildings

Shakib, Hamzeh; Fuladgar, A.

doi:10.1016/j.engstruct.2003.08.008

Cited by 23 publications

(8 citation statements)

References 12 publications

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“…Hence, these mechanisms result in a considerable decrease of seismic damage in the superstructure and its contains by reducing relative displacement of the stories and transmitting acceleration. The seismic isolation systems include elastomeric, sliding or rolling bearings, or a combination of both [1,2].…”

Section: Introductionmentioning

confidence: 99%

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A new elastomeric-sliding seismic isolation system

Mozaheb¹,

Behnamfar²

2018

J. vibroeng.

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A new seismic isolation system is introduced in this study that utilizes a combination of confined rubber for vertical loading and sliding rings for energy absorption. In this new system, a central elastomeric core is contained between the steel sliding rings. In laboratory testing of the proposed system, it was shown that the steel rings maintained the required vertical stiffness of the system by controlling the lateral deformation of the rubber core. In the lateral motion, the steel rings dissipated energy by sliding on each other under a friction force limited by their small share of the gravity loads. The advantages of the proposed system as compared with the conventional laminated-rubber bearing include increased vertical stiffness and energy absorption capacity as well as ease of manufacturing at a lowered cost.

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Section: Introductionmentioning

confidence: 99%

“…The sliding bearings are one of the isolation systems which are very effective in diminishing seismic accelerations in the structures with various fundamental frequencies [2]. The Friction Pendulum System (FPS) is among the mentioned systems where a combination of pendulum action and sliding of bearings is used.…”

Section: Introductionmentioning

confidence: 99%

A new elastomeric-sliding seismic isolation system

Mozaheb¹,

Behnamfar²

2018

J. vibroeng.

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“…A number of analytical and laboratory studies concluded that structures located near active faults may be subjected to unaccounted for demands if VGM was underestimated [Saadeghvariri and Foutch, 1991;Broderick and Elnashai, 1995;Button et al, 2002;Shakib and Fuladgar, 2003;Elnashai et al, 2005;Kianoush and Chen, 2006]. Columns may be adversely affected if high compressive forces are developed or if axial forces changed to tension.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bidirectional Excitations on Seismic Response of Rc Buildings

Mwafy

2012

J. Earthquake and Tsunami

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This paper investigates the effect of the horizontal and vertical components of ground motions (HGM and VGM, respectively) on the seismic response of Reinforced Concrete (RC) buildings designed to modern capacity design principles and located in the vicinity of active faults. Fiber-based analytical models are used to monitor the global and local response of twelve reference structures, including verifying the response modification factor and tracing the member shear supply-demand response using a ductility-and axial force-sensitive shear strength approach. The simulation models are subjected to nearfield earthquake records with increasing severity up to collapse, including and excluding VGM. The results indicate that the lower the contribution of horizontal seismic forces to the seismic response, the higher is the significance of VGM. The fluctuation of axial forces in vertical structural members significantly increases when including VGM. This not only has direct consequences on tension and compression response but also has impact on shear capacity. The diverse range of buildings and performance criteria and large number of incremental dynamic analyses confirm the importance of including VGM in seismic design and assessment of contemporary RC buildings, and hence cast doubts on the reliability of pre-code structures located in the vicinity of active faults.

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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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Effect of vertical component of earthquake on the response of pure-friction base-isolated asymmetric buildings

Cited by 23 publications

References 12 publications

A new elastomeric-sliding seismic isolation system

A new elastomeric-sliding seismic isolation system

Effect of Bidirectional Excitations on Seismic Response of Rc Buildings

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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