The effect of soil–structure interaction on the seismic risk to buildings

Khosravikia, Farid; Mahsuli, Mojtaba; Ghannad, Mohammad Ali

doi:10.1007/s10518-018-0314-z

Cited by 33 publications

(12 citation statements)

References 29 publications

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“…In order to investigate the performance of the systems at the design level, the randomly selected record is scaled to the design spectral acceleration at the period of the structure, Sa, from the code. For more detail about the ground motions and the scaling method, see Khosravikia et al (2018). Different ranges for the values of P(μSSI>μfix) represent different interpretation on the consequences of practicing SSI provisions, as follows: 1) P(μSSI>μfix) < 0.4 represent the cases in which the SSI design procedure results in conservative and uneconomic design compared to the fixed design procedure.…”

Section: Probabilistic Evaluation Metricmentioning

confidence: 99%

“…The effect of SSI on the structural performance of the yielding structures was more recently addressed by Khoshnoudian et al (2013), Demirol and Ayoub (2017), and Hassani et al (2018). Moreover, taking one step further, Khosravikia (2016) and Khosravikia et al (2018) showed that SSI may increase the seismic risk of buildings. Therefore, assuming a purely beneficial effect for SSI on yielding structures, which is the basis of the seismic design codes, needs further investigations.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Assessment of Soil-Structure Interaction Regulations of ASCE 7-16 and ASCE 7-10

Khosravikia¹,

Mahsuli²,

Ghannad³

2018

Structures Congress 2018

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This paper evaluates the consequences of practicing soil structure interaction (SSI) regulations of ASCE 7-16 on seismic performance of building structures. The motivation for this research stems from the significant changes in the new SSI provisions of ASCE 7-16 compared to the previous 2010 edition. Generally, ASCE 7 considers SSI as a beneficial effect, and allows designer to reduce the design base shear. However, literature shows that this idea cannot properly capture the SSI effects on nonlinear systems. ASCE 7-16 is the first edition of ASCE 7 that considers the SSI effect on yielding systems. This study investigates the consequences of practicing the new provisions on a wide range of buildings with different dynamic characteristics on different soil types. Ductility demand of the structure forms the performance metric of this study, and the probability that practicing SSI provisions, in lieu of fixed-base provisions, increases the ductility demand of the structure is computed. The analyses are conducted within a probabilistic framework which considers the uncertainties in the ground motion and in the properties of the soil-structure system. It is concluded that, for structures with surface foundation on moderate to soft soils, SSI regulations of both ASCE 7-10 and ASCE 7-16 are fairly likely to result in a similar and larger structural responses than those obtained by practicing the fixed-base design regulations. However, for squat and ordinary stiff structures on soft soil or structures with embedded foundation on moderate to soft soils, the SSI provisions of ASCE 7-16 result in performance levels that are closer to those obtained by practicing the fixed-base regulations. Finally, for structures on very soft soils, the new SSI provisions of ASCE 7-16 are likely to rather conservative designs.

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Section: Probabilistic Evaluation Metricmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative Assessment of Soil-Structure Interaction Regulations of ASCE 7-16 and ASCE 7-10

Khosravikia¹,

Mahsuli²,

Ghannad³

2018

Structures Congress 2018

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“…Together with this evidence at large scale or on huge building stocks, studies based on detailed models of prototype buildings and more refined analyses methods turn out very useful to understand the phenomenon and also deepen the potential effect of the soil-foundation-structure interaction (SFS). In [9] the topic is treated in a parametric way to attempt in providing a general overview of such effects on various structural typologies (classifiable according to their dynamic behaviour as "stiff" or "flexible") concluding how the SFS may produce either beneficial or detrimental effects. The literature works specifically addressed to URM buildings are still very few, and usually focused to slender structures, like as towers or minarets [10,11,12], or massive monumental assets, like as fortresses [13,14].…”

Section: Introductionmentioning

confidence: 99%

On the Site-Amplification and Soil-Structure Interaction in Urm Structures: Use of Fragility Curves to Assess the Simplified Code-Approach

Brunelli¹,

Silva²,

Cattari³

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The paper investigates the effects of site-amplification and soil-foundation-structure interaction (SFS) on the fragility curves of a real unreinforced masonry (URM) structure. The building is inspired to a school with an irregular T-shape plan and is modelled according to the equivalent frame approach. The structure was ideally placed on a stiff rock outcrop (case FB A) or settled on four different soft soil profiles, including its real foundation subsoil. In the latter cases the base of the structural model was assumed as fixed (FB C) or endowed with springs (CB C) simulating the soil-foundation dynamic impedance. To evaluate the fragility curves, the corresponding structural models were analysed through non-linear dynamic analyses under 136 input motions, propagated in 1D soil models reproducing the selected profiles for FB C and CB C. The results were compared in the paper in terms of: -fragility curves calculated for five damage levels (defined to be conceptually consistent with those of the EMS98 scale) and expressed as a function of different intensity measures of the input motion; -average damage derived as a weighted average of the probability of failure associated to all the damage levels. The comparison among the results of the different models highlights the expected increase of damage due to site effects and a beneficial effect of soil-structure interaction, mainly due to the increment of damping associated to the additional energy dissipated by the soil-foundation system. Finally, the average damage of FB C and CB C models were compared with those obtained from the fragility curves of a fixed base system in which site effects are considered through the conventional coefficients proposed in Codes (e.g. by the Eurocode 8), that neglect SFS. This latter approach is that followed in the current practice. The comparison demonstrates that the Code-based approach underestimates the fragility especially at high damage levels.

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“…For this concern, Far [3] has illustrated a comprehensive review on accurate and realist modeling technique and computational methods treating the SSI effects on structures resting on soft soils. The elaborated investigations aimed to study the effect of SSI and the seismic impact on structural response [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of soil structure interaction by the spectral element method

Souad

Khalfallah

Hamioud

2019

Innov. Infrastruct. Solut.

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This paper describes the dynamic analysis of soil-structure interaction by using the spectral element method (SEM). This numerical method is a powerful numerical technique suited for the dynamic tasks. In this case, numerical methods with highly developed computer technique become very efficient to analyze complex problems. The partial differential equation governing the motion is derived and solved by using SEM. Thus, the corresponding solutions are the eigenvalues of the problem, so natural frequencies are tabulated for the first three modes of vibration. This numerical analysis treats the effect of: (a) the modal analysis with and without the elastic medium, (b) the influence of the interaction between the beam and soil, (c) the influence of the soil properties on the dynamic response, and (d) the influence of the non-classical boundary conditions. The obtained results of these effects are presented and commented.

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The effect of soil–structure interaction on the seismic risk to buildings

Cited by 33 publications

References 29 publications

Comparative Assessment of Soil-Structure Interaction Regulations of ASCE 7-16 and ASCE 7-10

Comparative Assessment of Soil-Structure Interaction Regulations of ASCE 7-16 and ASCE 7-10

On the Site-Amplification and Soil-Structure Interaction in Urm Structures: Use of Fragility Curves to Assess the Simplified Code-Approach

Dynamic analysis of soil structure interaction by the spectral element method

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