The Effects of Vertical Ground Motion on Base-Isolated Building Systems

Lew, Marshall; Hudson, Martin B.

doi:10.1193/1.1586046

Cited by 10 publications

(6 citation statements)

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“…The ratios of peak vertical accelerations recorded in the roof to those at the ground level were 3.75, 6.4, and 2.4. In addition, Lew and Hudson (1999) examined several instrumented buildings and observed that vertical accelerations transmitted from the ground to the building were not affected by the presence of an isolation system.…”

Section: Introductionmentioning

confidence: 99%

Performance of flexible frame building with horizontal and 3D seismic isolation when subjected to 3D ground shaking

Eltahawy

Ryan

2020

Earthquake Spectra

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Seismic isolation is known to effectively mitigate the effects of horizontal ground shaking in building structures. Recent research has suggested that vertical excitation causes high-intensity slab vibrations that lead to nonstructural component damage. A detailed case study of the application of three-dimensional (3D) isolation in a realistic multi-story frame building is presented. Specifically, the seismic responses of hypothetical special concentric braced frame buildings with horizontal and 3D isolation are compared to evaluate the effectiveness of 3D isolation to mitigate the vertical ground shaking. Overall, 3D isolation with a relatively short isolation period (0.5 s) is adequate to significantly mitigate the vertical acceleration in a flexible frame building, including the amplification at mid-slab relative to adjacent columns, without compromising the usual reductions in horizontal responses.

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Section: Introductionmentioning

confidence: 99%

Performance of flexible frame building with horizontal and 3D seismic isolation when subjected to 3D ground shaking

Eltahawy

Ryan

2020

Earthquake Spectra

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show abstract

“…However, there is less research on vertical isolation at home and abroad, especially on the three-dimensional base isolation. The scholars of United States, Japan, France and other counties, are spare no effort to conduct the research and solve this problem [3]. Chinese scholars put forward several three-dimensional isolation devices and have done some related researches [4].…”

Section: Introductionmentioning

confidence: 99%

Design and Numerical Simulation of the Disk Spring Vertical Isolation Device

Yan

Wang

2014

AMM

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A vertical isolation device was designed and based on test requirements in this paper, which adopt disk spring with external guide sleeve. Through reasonable designing, this device can meet the requirements of stiffness and bearing capacity, etc. Single disk spring and properties of vertical isolation device were analyzed by finite element software ANSYS. The numerical simulation and the theoretical solution of single disk spring are basically coincident when small deformation. Even the deformation is large and there only are minor differences. The contact problems between disk springs, disk group and external sleeve, should be taken into consideration. The comparisons for hysteretic curve between numerical simulation and experiment result of vertical isolation device shows that their stiffness and energy dissipation capacity are very close, and the precision of the model can satisfy the requirement of numerical analysis and engineering application.

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“…In the high-intensity areas, isolation building reduces horizontal earthquake action, the vertical earthquake action may become the main controlling factor of structural response, it reduces the structural security. The domestic and foreign scholars on vertical isolation technology has carried out some useful exploration [1][2], but most studies have been launched for the far-field earthquakes, vertical isolation research of the relevant domestic near-fault earthquake is rare.…”

Section: Introductionmentioning

confidence: 99%

Vertical Vibration Control of Series Isolation System under Near-Fault Earthquake

Rong

Yan

Liu

2014

AMM

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Series isolation system consists of rubber isolation bearings and composite disk springs, determination method of vertical stiffness and vertical damping of isolation layer is given. Entering the near-fault vertical seismic waves, the affect of isolation layer parameters and earthquake intensity on the isolation effect is studied. Studies have shown that the vertical isolation effect increases with the increase of vertical damping ratio. When the damping ratio reaches a certain value, the isolated effect leveles off. When calculating model is adopted as the hierarchical model, vertical isolation effect has nothing to do with the increases of earthquake intensity.

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The Effects of Vertical Ground Motion on Base-Isolated Building Systems

Cited by 10 publications

References 0 publications

Performance of flexible frame building with horizontal and 3D seismic isolation when subjected to 3D ground shaking

Performance of flexible frame building with horizontal and 3D seismic isolation when subjected to 3D ground shaking

Design and Numerical Simulation of the Disk Spring Vertical Isolation Device

Vertical Vibration Control of Series Isolation System under Near-Fault Earthquake

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