Seismic Simulation of an Integrated Ceiling-Partition Wall-Piping System at E-Defense. I: Three-Dimensional Structural Response and Base Isolation

Ryan, Keri L.; Soroushian, Siavash; Maragakis, Emmanuel M.; Sato, Eiji; Sasaki, Tomohiro; Okazaki, Taichiro

doi:10.1061/(asce)st.1943-541x.0001384

Cited by 63 publications

(43 citation statements)

References 20 publications

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“…The vertical modes were selected according to dominant slab vibration frequencies observed in slab response spectra. The vibration periods of all the vertical modes discussed (Figures 8 and 9) are in agreement with measured frequencies of various slabs reported in Ryan et al 15 Namely, the observed periods of slab vibration modes ranged from about 0.08 seconds at the second floor to 0.13 seconds at the roof (7.7-12.5 Hz). The y-direction was selected because of several sources of stiffness and mass irregularity that were not present in the x-direction (eg, unequal bay widths in y-direction and supplementary mass at the roof level on the east half of the building).…”

Section: Modal Analysissupporting

confidence: 90%

“…The calibrated damping ratios corresponded loosely to experimentally observed damping ratios during earthquake shaking of the roof slab (first vertical mode) and the fifth floor slab (second vertical mode) as determined in Ryan et al 15 The effect of these calibrations is discussed later in more detail. For both the LRB/CLB and fixed-base models, a constant modal damping of 2.5% was found to give a good match between experimental and numerical results.…”

Section: Numerical Model Of Specimensupporting

confidence: 76%

“…Modern isolation techniques have been successfully implemented in practice, as well as tested at both component and system levels. In both of these studies, 9,15 the effectiveness of seismic isolation to reduce floor acceleration was demonstrated, consistent with numerous prior investigations that have proven the benefits of seismic isolation relative to conventional structures. The experiments conducted at NEES@UCSD and E-Defense also investigated the effect of base isolation on the seismic response of NCSs.…”

supporting

confidence: 83%

“…Several studies, including the aforementioned E-Defense tests 12,15 and others, 16,17 have noted the impact strong vertical ground excitation has on the vibration response of floor systems in both fixed-base and isolated structures. Field evidence after the 1994 Northridge earthquake indicated complete failure or collapse of the floor systems in several structures, controlled by shear failure mechanisms due to vertical excitation, while the lateral load resisting systems did not exhibit damage attributable to horizontal forces.…”

mentioning

confidence: 99%

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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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Section: Modal Analysissupporting

confidence: 90%

Section: Numerical Model Of Specimensupporting

confidence: 76%

supporting

confidence: 83%

mentioning

confidence: 99%

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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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“…However, it is noted that further evidence is needed to conclude that the vertical acceleration demands observed in the experiments were representative of realistic structural systems (Ryan et al, 2015).…”

Section: -19mentioning

confidence: 99%

Seismic analysis, design, and installation of nonstructural components and systems � background and recommendations for future work

Faecke¹

2017

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Seismic performance analysis of steel frame structures with separated three‐dimensional isolation

Shi

Wang

Zhang

et al. 2023

Earthquake Engineering and Resilience

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base isolation can significantly improve the seismic performance of structures. However, significant 3D movement coupling and rocking behavior of the superstructure due to the high gravity center of the structure can be observed, which will lead to a complex design of the isolation system and the isolators. In addition, as the 3D isolators are installed beneath the structures, they need to support the heavy weight of the superstructure with low vertical stiffness. It is difficult to meet both the vertical load and stiffness design demands of the isolators using traditional isolation materials and mechanisms, especially for large-size structures. A separated 3D isolation scheme is proposed by installing the horizontal isolation at the base of the superstructure and the vertical isolation under the floor slabs. Simulations are carried out to examine the dynamic responses including the acceleration, inter-storey drift, and stress of structural members of a typical steel frame structure with the separated 3D isolation scheme. The isolation effect was also studied by shaking table tests of a two-storey steel frame structure.

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Seismic Simulation of an Integrated Ceiling-Partition Wall-Piping System at E-Defense. I: Three-Dimensional Structural Response and Base Isolation

Cited by 63 publications

References 20 publications

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

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

Seismic analysis, design, and installation of nonstructural components and systems � background and recommendations for future work

Seismic performance analysis of steel frame structures with separated three‐dimensional isolation

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