Uplift Behaviour of Spread Foundation Structures on Sand and Clay Deposits

Imamura, Akira; Hashimoto, Takayuki; Suzuki, Yoshio; Adachi, Nobuyasu; Sako, Yuji

doi:10.3130/aijs.78.1759

Cited by 3 publications

(9 citation statements)

References 3 publications

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“…A simulation analysis was performed for the centrifugal shaking table experiment with or without adhesive force (Imamura et al, 2013). The analysis method applicability was then examined.…”

Section: Outlinementioning

confidence: 99%

“…Figure 7 shows the analysis model, a symmetric model similar to the analysis model of Imamura et al, 2013. The sizes of the ground FE elements under the structure were set to be the same.…”

Section: Analysis Model and Conditionsmentioning

confidence: 99%

“…However, the knowledge about these behavior under the low ground contact ratio is not sufficient. Therefore, we investigated references that describe experimental results and analytical conditions that could be confirmed by simulation analysis (JNES, 2007;Imamura et al, 2013;Yano et al, 1991;Ookouchi et al, 2017;Ishikawa et al, 2020). In this study, we investigated the behavior of the two kinds of the basemat uplift problems by conducting seismic response analysis using a three-dimensional (3D) finite element model.…”

Section: Introductionmentioning

confidence: 99%

“…First problem is a simulation analysis of JNES's problem (JNES, 2007) showing the capability of the basemat uplift analysis of three analysis codes. Second problem is simulation analyses of a shaking table test under the centrifugal load (Imamura et al, 2013), which involved examinations with or without adhesion between the basemat and the bearing ground. We discussed the influence of the two conditions and the values of the adhesive force determined by numerical and experimental procedures.…”

Section: Introductionmentioning

confidence: 99%

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Analytical study for low ground contact ratio of buildings due to the basemat uplift using a three-dimensional finite element model

Choi

Nishida

Shiomi

et al. 2023

Mechanical Engineering Journal

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The basemat uplift is a phenomenon that the bottom of the basemat of a building partially rises from the ground due to overturning moments and vertical motions during earthquake. The degree of the basemat uplift can be indicated using a ground contact ratio which is defined as a ratio of the contact area of the bottom of the basemat to its entire area. The problem is that, at a large earthquake, the basemat uplift becomes large, so-called low ground contact ratio state, and the basemat falls resultant to recontact between the basemat and the ground, and large acceleration response occur on the floor of the building. It is a crucial aspect in the seismic evaluation of a nuclear facility building. It affects not only structural integrity of the building but also the response of the equipment installed in the building. However, the building behavior under the low ground contact ratio state lacks sufficient study. In this study, we conducted seismic response analyses for the building using a threedimensional finite element model and simulated shaking table experiments focused on the basemat uplift and confirmed the validity of this analysis method. Since the basemat uplift is a strong non-linear phenomenon, we conducted computer simulations under the same analysis conditions with three different analysis codes, namely E-FrontISTR, FINAS/STAR, and TDAPIII, and compared the results. We investigated the influence on the structural response caused by the difference of the adhesive force of the basemat and the bearing ground at the low ground contact ratio state. In addition, we studied the influence of numerical parameters to the structural response through sensitivity analyses. This paper reports the analysis results and the insights obtained from our investigations.

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“…A simulation analysis was performed for the centrifugal shaking table experiment with or without adhesive force (Imamura et al, 2013). The analysis method applicability was then examined.…”

Section: Outlinementioning

confidence: 99%

“…Figure 7 shows the analysis model, a symmetric model similar to the analysis model of Imamura et al, 2013. The sizes of the ground FE elements under the structure were set to be the same.…”

Section: Analysis Model and Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analytical study for low ground contact ratio of buildings due to the basemat uplift using a three-dimensional finite element model

Choi

Nishida

Shiomi

et al. 2023

Mechanical Engineering Journal

View full text Add to dashboard Cite

show abstract

“…For the seismic design of a nuclear power plant, analytical studies on non-linear rocking behavior have been conducted [e.g., Muto and Kobayashi (1979), Yamada and Kawamura (1984), Shimomura (1988), Yano et al (1991), and Nakamura et al (2016)]. Moreover, experimental studies using shaking table or centrifugal tests have been conducted [e.g., Yano et al (1983), Hangai et al (1986Hangai et al ( , 1987, Ishikawa et al (2007), Imamura et al (2014), and Imamura et al (2013)]. There are analytical and experimental studies on other types of buildings too [e.g., Midorikawa et al (2009), Ishihara et al (2009), andNakamura et al (2014)].…”

Section: Introductionmentioning

confidence: 99%

Centrifuge Testing and Seismic Response Analysis for Uplift Behavior of Spread Foundation Structures on Rock

Suzuki

Ogase²,

Honda

et al. 2016

Front. Built Environ.

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The uplift behavior of structures subjected to severe seismic motion has not been clarified. This paper presents experimental and analytical studies conducted for clarifying this problem of spread foundation structures on rock. First, centrifugal loading tests are conducted to determine the uplift behavior of these structures, and the uplift behavior of these structures is confirmed. Then, simulation analyses are performed using a three-dimensional FE model, and the accuracy of these analyses is confirmed. A comparison between test and analyses results clarified the important analytical conditions required for maintaining analysis precision and the limit of analysis precision.

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Faster Uplift Analysis Using Inverse of Partial Tangent Stiffness Matrix

Suzuki

2019

Nihon Kenchiku Gakkai Kozokei Ronbunshu

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This study proposes a novel method to accelerate the uplift analysis for NPP buildings. The proposed method does not require an inverse matrix operation of the whole tangent stiffness matrix. Instead, by using the inverse of the partial tangent stiffness matrix, the calculation time can be reduced. First, the outline and details of the method are described. Then, the results of the experiments that were performed to evaluate the proposed method are presented. The results indicate that the proposed method can reduce calculation time to less than half of that required for the tangential stiffness method.

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Uplift Behaviour of Spread Foundation Structures on Sand and Clay Deposits

Cited by 3 publications

References 3 publications

Analytical study for low ground contact ratio of buildings due to the basemat uplift using a three-dimensional finite element model

Analytical study for low ground contact ratio of buildings due to the basemat uplift using a three-dimensional finite element model

Centrifuge Testing and Seismic Response Analysis for Uplift Behavior of Spread Foundation Structures on Rock

Faster Uplift Analysis Using Inverse of Partial Tangent Stiffness Matrix

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