Effects of soil–structure interaction on distribution of seismic vulnerability in RC structures

Behnamfar, Farhad; Banizadeh, M.

doi:10.1016/j.soildyn.2015.10.007

Cited by 64 publications

(26 citation statements)

References 10 publications

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“…Flexibility of base relaxes the displacement boundary condition and results in a considerable increase in the lower story drift ratio. The same behavior has been reported and discussed extensively in (Behnamfar and Banizadeh, 2016) for TS models of moment frames. In the NTS models, the ratio is even larger at the same place.…”

Section: Horizontal Story Driftssupporting

confidence: 79%

Seismic behavior of structures considering uplift and soil–structure interaction

Behnamfar

Mirhosseini

Alibabaei

2017

Advances in Structural Engineering

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A common assumption when analyzing a structure for earthquake forces is that the building is positively attached to a rigid ground so that it can sustain possible tensile forces without being detached, or uplifted, from its bearing points. Considering the facts that almost no tension can be transferred between a surface foundation and soil and soft soils interact with the supported structure during earthquakes, in this research, the effects of uplift and soil–structure interaction on nonlinear seismic response of structures are evaluated. Several reinforced concrete and steel structures under different suits of consistent ground motions are considered. The base of the buildings is modeled with vertical no-tension springs being nonlinear in compression. The total soil–structure interaction system is modeled within OpenSees, and the seismic behavior is evaluated using a nonlinear dynamic analysis. The nonlinear responses of buildings are determined and compared between three cases: fixed base, flexible base without uplift, and flexible base with uplift. The cases for which uplift in conjunction with soil–structure interaction should be considered are identified.

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Section: Horizontal Story Driftssupporting

confidence: 79%

Seismic behavior of structures considering uplift and soil–structure interaction

Behnamfar

Mirhosseini

Alibabaei

2017

Advances in Structural Engineering

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“…One of the issues that can affect the seismic response of structures is soil-structure interaction (SSI), which has been investigated by many researches (e.g., [30][31][32]). Depending on the stiffness of the soil, the seismic performance and energy dissipation of structures can significantly be changed by considering the SSI effects.…”

Section: Soil-structure Modelmentioning

confidence: 99%

“…Khoshnoudian et al showed that soil flexibility increases the dynamic instability of structural system and collapse strength reduction factor highly decreases by increasing nondimensional frequency [30]. Shakib and Homaei showed that SSI reduces the structural seismic capacities, ductile deformation, and life-safety confidence level [31]. In addition, they showed that SSI increases the drift demand.…”

Section: Soil-structure Modelmentioning

confidence: 99%

Soil‐Structure Interaction Effect on Fragility Curve of 3D Models of Concrete Moment‐Resisting Buildings

Anvarsamarin

Rofooei

Nekooei

2018

Shock and Vibration

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This paper presents the probabilistic generation of collapse fragility curves for evaluating the performance of 3D, reinforced concrete (RC) moment-resisting building models, considering soil-structure interaction (SSI) by concentration on seismic uncertainties. It considers collapse as the loss of lateral load-resisting capacity of the building structures due to severe ground shaking and consequent large interstory drifts intensified by -Δ effects as well as the strength and stiffness deterioration of their lateral load carrying systems. The estimation of the collapse performance of structures requires the relation between the intensity measure (IM) and the probability of collapse that is determined using the generated collapse fragility curves. Considering a number of 6-, 12-, and 18-story, 3D, RC moment-resisting buildings, two scalar IMs are employed to estimate their collapse fragility curve. On the other hand, the effect of the site soil type on the collapse fragility curves was taken into account by considering the soil-structure interaction. According to the obtained results, adopting the average of spectral acceleration (Saavg) intensity measure is more efficient in capturing the effect of the inherent uncertainties of the strong ground motions on the structural response parameters. In addition, considering the SSI for soil type D with shear-wave velocity of 180 m/s to 360 m/s reduces the median of intensity measure (IM = Sa( 1 )) of fragility curve in 6-, 12-, and 18-story buildings by 4.92%, 22.26%, and 23.03%, respectively.

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“…is enhanced criterion is a result reflecting the outcome of current research works in which the soil originally considered as relatively stiff (i.e., 1,070 m/s-2,440 m/s) can possibly influence the structure responses, quite a lot [14]. e research exploring the SSI effects on the responses and probabilistic seismic vulnerabilities of the structure has been actively studied recently [15][16][17]. Especially, such studies were subsequently extended into such SSI studies on nuclear power plants (NPPs).…”

Section: Introductionmentioning

confidence: 99%

Beneficial and Detrimental Effects of Soil-Structure Interaction on Probabilistic Seismic Hazard and Risk of Nuclear Power Plant

Kwag

Jung

2018

Advances in Civil Engineering

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The purpose of this study is to investigate the soil-structure interaction (SSI) effect on the overall risk of a PWR containment building structure with respect to two failure modes: strength and displacement. The precise quantification of the risk within the seismic probabilistic risk assessment framework depends considerably on an accurate treatment of the seismic response analysis. The SSI effect is one of the critical factors to consider when accurately predicting structural responses in the event of an earthquake. Previous studies have been conducted by focusing more on the positive side of the SSI effects and the effects mainly on the seismic fragility result. Therefore, this paper presents the results of a study of the SSI effect on the overall risk. Also, the study relies on an emphasis on revealing a beneficial and a detrimental effect of the SSI by utilizing an example of the containment structure in three soil conditions and two main failure modes. As a result, the consideration of SSI shows a complete conflicting effect on the seismic fragility and risk results depending on two failure modes considered in this study. This has a positive effect regarding the strength failure mode, but this brings a negative effect regarding the displacement failure mode. The risk fluctuation width is particularly noticeable in the site having a considerable change in seismic hazard information such as Los Angeles on the western site of the US. Such results can be expected to be utilized in a future study for investigating the pros and cons of the SSI effect associated with various failure modes in diverse conditions.

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Effects of soil–structure interaction on distribution of seismic vulnerability in RC structures

Cited by 64 publications

References 10 publications

Seismic behavior of structures considering uplift and soil–structure interaction

Seismic behavior of structures considering uplift and soil–structure interaction

Soil‐Structure Interaction Effect on Fragility Curve of 3D Models of Concrete Moment‐Resisting Buildings

Beneficial and Detrimental Effects of Soil-Structure Interaction on Probabilistic Seismic Hazard and Risk of Nuclear Power Plant

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