Robustness evaluation of seismic pile response considering uncertainty mechanism of soil properties

Okada, Takao; Fujita, Kohei; Takewaki, Izuru

doi:10.1007/s41062-016-0009-8

Cited by 9 publications

(6 citation statements)

References 22 publications

(53 reference statements)

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“…As for researches on the effect of uncertainty of parameters on response variability, Taniguchi and Takewaki (2015) derived the bound of earthquake input energy to building structures by considering shallow and deep ground uncertainties and soilstructure interaction. Okada et al (2016) proposed a new interval analysis technique for a soil-pile-structure interaction model by taking into account the uncertainty in soil properties. Makita et al (2018) considered a base-isolation, building-connection hybrid structural system (Murase et al, 2013(Murase et al, , 2014Kasagi et al, 2016;Fukumoto and Takewaki, 2017) and took into account the uncertainty in the site amplification.…”

Section: Introductionmentioning

confidence: 99%

Critical Ground Motion for Resilient Building Design Considering Uncertainty of Fault Rupture Slip

Makita

Kondo

Takewaki

2018

Front. Built Environ.

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The process of theoretical ground motion generation consists of (i) the fault rupture process, (ii) the wave propagation from the fault to the earthquake bedrock, (iii) the site amplification. The uncertainty in the site amplification was taken into account in the previous research (Makita et al., 2018). On the other hand, the uncertainty in the fault rupture slip (slip distribution and rupture front) is dealt with in the present paper. The wave propagation from the fault to the earthquake bedrock is expressed here by the stochastic Green's function method in which the Fourier amplitude of the ground motion at the earthquake bedrock from a fault element is represented by the Boore's model and the phase angle is modeled by the phase difference method. The validity of the proposed method is investigated through the comparison with the existing simulation result by other methods. By using the proposed method for ground motion generation and for optimization under uncertainty in the fault rupture slip, a methodology is presented for deriving the critical ground motion imposing the maximum response of an elastic SDOF model at the earthquake bedrock or at the free ground surface. It is shown that the critical response exhibits the SDOF response several times larger than that due to the average fault rupture slip model. Furthermore, the robustness evaluation with respect to the uncertain fault rupture slip and the uncertain fault rupture front is presented for resilient building design. Since the critical ground motion produces the most detrimental building response among possible scenarios, the proposed method can be a reliable tool for resilient building design.

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Section: Introductionmentioning

confidence: 99%

Critical Ground Motion for Resilient Building Design Considering Uncertainty of Fault Rupture Slip

Makita

Kondo

Takewaki

2018

Front. Built Environ.

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“…In the NURP method, the variation of responses due to the uncertainty of design parameters is predicted by the cubic curve fitting based on the comparison with actual responses. Application examples and the outline of the NURP algorithm can be found in Okada et al (2016).…”

Section: Evaluation Of Robustness Using Uncertainty Analysismentioning

confidence: 99%

Robust Optimal Damper Placement of Nonlinear Oil Dampers With Uncertainty Using Critical Double Impulse

Fujita

WATAYA

Takewaki

2021

Front. Built Environ.

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A new robust method for optimal damper placement is presented for building structures under the critical double impulse. Oil dampers are treated here as representative supplemental dampers to control the seismic response of high-rise buildings. Such oil dampers usually obey a bi-linear force-velocity relation in controlling the maximum damping force through a relief mechanism to avoid the occurrence of excessive design forces in surrounding frames. The influence of uncertainty in characteristics of those bi-linear oil dampers on building structural safety is investigated. For the efficient evaluation of dynamic performance, the resonant critical double impulse is used as the base input instead of actual earthquake ground motions. Since the critical double impulse is determined to maximize the input energy to the objective building by changing the second impulse timing, uncertainties in input ground motions can be taken into account in a robust manner. To consider these various uncertainties, the robustness function based on the Info-Gap model is used in the robust optimization to assess structural performance variations caused by various uncertainties in the structural design phase. In this paper, a new innovative objective function in the robust optimal damper placement problem is proposed to enhance the robustness of structural performance under the variation of structural parameters by comparing the robustness function of the robust design with that of an ordinary optimal damper placement without considering uncertainties. Numerical examples of the robust optimal design of linear and bi-linear oil damper placements are shown for 10-story and 20-story planar building frame models. Structural performances of the robust optimal design to the conventional design earthquake ground motions are examined to investigate the validity of using the critical double impulse in the structural design under uncertainties.

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“…A newly developed updated reference point (URP) method was used by Okada et al [69], to study the seismic Up Ug showing the forces in a soilpile-structure system [100] pile response of a structure-pile-soil system with uncertain soil and concrete properties. A ten storied building was modeled and the pile head bending moments were compared in URP and NURP methods.…”

Section: Numerical Investigationmentioning

confidence: 99%

A review on soil–structure interaction analysis of laterally loaded piles

Kavitha

Beena

Narayanan

2016

Innov. Infrastruct. Solut.

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Soil-structure interaction plays an important role in the behavior of structure under static or dynamic loading. It influences the behavior of soil, as well as the response of pile under loading. The analysis is highly essential for predicting a more accurate structural behavior so as to improve the safety of structures under extreme loading conditions. The soil-pile system behavior is predominantly nonlinear and this makes the problem complicated. In a laterally loaded pile the load is resisted by the soil-pile interaction effect, which in turn depends on soil properties, pile material, pile diameter, loading type and bed slope of ground. The difficulty in the accountability of the influencing factors necessitates a careful study on soil-structure interaction problem. The analysis became easier with the debut of powerful computers and simulation tools such as finite element analysis software. A detailed literature review on soil-structure interaction analysis of laterally loaded piles is presented in this paper.

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Robustness evaluation of seismic pile response considering uncertainty mechanism of soil properties

Cited by 9 publications

References 22 publications

Critical Ground Motion for Resilient Building Design Considering Uncertainty of Fault Rupture Slip

Critical Ground Motion for Resilient Building Design Considering Uncertainty of Fault Rupture Slip

Robust Optimal Damper Placement of Nonlinear Oil Dampers With Uncertainty Using Critical Double Impulse

A review on soil–structure interaction analysis of laterally loaded piles

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