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

Pujols, Jean C. Guzman; Ryan, Keri L.

doi:10.1002/eqe.2973

Cited by 19 publications

(5 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, evidence was presented that vertical vibration characteristics and thus axial force variation in full-scale building is determined by flexibility of the floor slabs and not the vertical stiffness of the isolators. 25,26 Although many studies have demonstrated the effect of vertical or 3D shaking on increased base shear, no study has developed a general theoretical basis or simplified approach for accounting for such effects that can be implemented for design. Cilsalar and Constantinou 17 developed statistical results for the ratio of base shear with versus without vertical shaking, ranging from 1.06 to 1.22 for far-field motions and from 1.15 to 1.48 for near-fault motions.…”

Section: Noveltymentioning

confidence: 99%

“…Multiple references noted that bearing axial force histories were more difficult to replicate than other responses. However, evidence was presented that vertical vibration characteristics and thus axial force variation in full‐scale building is determined by flexibility of the floor slabs and not the vertical stiffness of the isolators 25,26 …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of effect of vertical ground shaking in bridges isolated with spherical sliding bearings

Ryan,

Mojidra

2023

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

Studies have shown that in structures isolated with spherical sliding bearings, the seismic base shear increases when the vertical component of ground shaking is explicitly considered, since the dynamic variation of bearing axial force is passed on to the base shear due to the friction mechanism. In this paper, the effect of vertical shaking is systematically investigated in multi‐span concrete box‐girder highway bridges isolated with triple pendulum bearings. Grounded in the theory of bearing mechanics, a simplified method to predict the amplification of base shear with vertical ground shaking intensity in such bridges is developed and evaluated. The simplified approach is potentially applicable for bridge design based on equivalent static analysis. At low to moderate vertical intensities, the simplified method can capture the observed variation in the base‐shear coefficient with isolation system parameters. The differences in base‐shear amplification for bridge superstructure parameter variations are insignificant, and thus the method is widely applicable. At high intensity vertical ground shaking, the base shear coefficient can be affected by an uplift and impact phenomenon. Thus, application of the simplified method should be limited to motions with peak vertical acceleration up to 1 g; simulation with 3D motions is recommended for intensities beyond 1 g.

show abstract

Section: Noveltymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of effect of vertical ground shaking in bridges isolated with spherical sliding bearings

Ryan,

Mojidra

2023

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…The results indicated that vertical vibration significantly amplifies the vertical acceleration response of the structure. Guzman et al [28] designed a bearing and applied to a steel frame structure to form a seismic isolated structure. It conducted shake table tests on it under coupled horizontal and vertical earthquake excitation.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Analysis of Mega-Sub Isolated Structures under Multiaxial Earthquakes

et al. 2023

View full text Add to dashboard Cite

With the use of seismic isolation techniques on mega-sub structures, several scholars have carried out research on them. However, little research has been carried out on mega-sub isolated structures under multiaxial earthquakes. There have been instances in actual engineering where the peak vertical acceleration exceeded the horizontal direction, and the vertical seismic component will also amplify the dynamic response of the structure in the horizontal direction, so in practice, it is necessary to consider the influence of the vertical component of the earthquake on the structure. To investigate the dynamic response of mega-sub isolated structures under unidirectional earthquake and coupled earthquake, this paper used numerical methods to analyze the influences of the horizontal and vertical damping ratio of the isolation layer, the horizontal and vertical frequency ratio of the main substructure, and the mass ratio of the main substructure on the acceleration and displacement of the main and substructure. The optimum parameter values are finally achieved by analytical calculations, which provide a basis for further optimization and practical design of the structure. Finally, the collision between the main and sub-structures in the mega-sub isolated structure was simulated, and the influences of the peak ground motion, main and subframe spacing, vertical seismic component, and sub-structure height on the collision force and acceleration were analyzed. It was shown that the conflict of the main and sub-structures generates instantaneous, large collision forces, which also instantaneously amplify the acceleration and base shear force response, which should be avoided in practical engineering.

show abstract

“…Shaking table tests have testified that rubber base isolation system could significantly amplify vertical accelerations [1]. Especially for the building under the near-fault (NF) vertical earthquakes, the structural and nonstructural damage was significant [2].…”

Section: Introductionmentioning

confidence: 99%

Horizontal-Vertical-Rocking Coupled Response Analysis of Vertical Seismic Isolated Structure under Near-Fault Earthquakes

Liu

Zhang

Fang

et al. 2020

Shock and Vibration

View full text Add to dashboard Cite

For vertical isolated structures with excessive vertical eccentricity for mass and vertical stiffness, horizontal-vertical-rocking response needs to be better understood for vertical isolated structures located in near-fault areas, where long-period velocity pulse can be produced. In this study, a seismic isolation system including quasizero stiffness (QZS) and vertical damper (VD) is used to control near-fault (NF) vertical earthquakes. The responses of horizontal-vertical-rocking coupling base-isolated structure including quasizero stiffness (QZS) and vertical damper (VD) subjected to NF horizontal and vertical ground motions are investigated. Nonlinear dynamic analyses are conducted to study the effects of essential parameters such as isolation system eccentricity, static equilibrium position, vertical isolation period, and vertical damping ratio on seismic responses of vertical isolated structure. It is found that increasing vertical period and damping ratio causes the vertical isolated structures to behave well in reducing rocking responses of structure. The effect of horizontal-vertical-rocking coupling on vertical seismic isolation efficiency is insignificant. The vertical seismic isolation remains effective as compared to the system supported on rubber bearings. The vertical damping can significantly control the vertical displacement and rocking moment.

show abstract

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

Cited by 19 publications

References 22 publications

Analysis of effect of vertical ground shaking in bridges isolated with spherical sliding bearings

Analysis of effect of vertical ground shaking in bridges isolated with spherical sliding bearings

Dynamic Response Analysis of Mega-Sub Isolated Structures under Multiaxial Earthquakes

Horizontal-Vertical-Rocking Coupled Response Analysis of Vertical Seismic Isolated Structure under Near-Fault Earthquakes

Contact Info

Product

Resources

About