Influence of SSI on Period and Damping of Buildings Supported by Shallow Foundations on Cohesionless Soil

Vivek, B.; Raychowdhury, P. N.

doi:10.1061/(asce)gm.1943-5622.0000890

Cited by 17 publications

(3 citation statements)

References 24 publications

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“…The various modes of foundation deformations, such as sliding, settlement, and rotation, can introduce additional flexibility to the system of structure and foundation, thereby changing the modal properties, such as natural period and mode shape [2]. Moreover, earthquake-induced large deformations of the foundations can activate the foundation capacity, leading to energy dissipation at the soil-foundation interface.…”

Section: Introductionmentioning

confidence: 99%

Effect of Non-Linear Soil Structure Interaction in Seismic Response of Asymmetric Structures

Balachandra Kartha,

Mukeshbhai Patel

2023

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

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Post-earthquake damage survey of asymmetric structures has revealed the significant vulnerability of failure as compared to symmetric structures. The asymmetric structures with asymmetric strength and stiffness induce a coupled torsional translational motion leads to additional ductility and displacement demands. The sensitivity analysis of the effect of the torsional component in the seismic response of structures requires an accurate analysis incorporating the effect of non-linear soil-structure interaction. The present study investigates the effect of asymmetry in seismic structural response particularly, the base shear, top drift, and inter-story drift of a structure incorporating a non-linear soil-foundation interface. A 3-story asymmetric and symmetric reinforced concrete structure is considered for the study. The structure is representative of existing buildings in the United Arab Emirates resting in loose sandy deposits. The structural elements are modeled as nonlinear beam-column elements that allow the spread of plasticity. The foundation-soil interface is modeled as fixed and Beams on Non-linear Winkler Foundation (BNWF) models in Opensees. The BNWF model has been calibrated to provide good predictive behavior to capture the base rotation, settlement, and sliding. The study shows that by introducing flexibility in asymmetric structures, the displacement demand increases by 24% and force demand decreases by 30% with respect to the symmetric structure with a fixed base. The study also shows that asymmetry in the structure causes a reduction in displacement due to increased structural stiffness.

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Section: Introductionmentioning

confidence: 99%

Effect of Non-Linear Soil Structure Interaction in Seismic Response of Asymmetric Structures

Balachandra Kartha,

Mukeshbhai Patel

2023

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

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“…Esto se debe a lo descrito por el Artículo A.7.1.2 (NSR-10) [5] y a las contribuciones de otros autores [6][7]. Al incorporar la ISE en el análisis, se esperan periodos más largos debido a la interacción cinemática, tal como se encontró en estudios [8][9], lo que a su vez reduce las fuerzas sísmicas que actúan en la edificación en comparación al modelo de base fija. Pero estos no son los únicos efectos por considerar, estudios ya han demostrado que esta conclusión es errónea desde ejemplos numéricos rigurosos [2] [10] [11] al tener en cuenta los efectos de la interacción inercial.…”

Section: Introductionunclassified

Análisis comparativo en la respuesta lineal de sistemas estructurales muro-pórtico representativos de Bucaramanga incorporando interacción suelo estructura

Oliveros-Caicedo,

Cotes-Prieto,

Zapata-Orduz

2023

Rev. politec.

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El presente artículo evalúo la influencia de la Interacción Suelo – Estructura (ISE) en la respuesta estructural lineal de sistemas muro-pórtico regulares representativos de Bucaramanga-Colombia utilizando el enfoque de subestructura propuesto por Winkler. Se recopiló información de sistemas locales existentes utilizando base de datos oficiales. Mediante el diseño de experimentos factorial 22, se crearon nueve edificios artificiales con diferentes tipos de suelo y número de pisos. Estos edificios fueron diseñados y detallados bajo la idealización de base fija, siguiendo la normativa sismorresistente local. Se llevaron a cabo análisis incluyendo y excluyendo la ISE. Los resultados revelaron que la ISE tuvo influencia significativa en la respuesta lineal de las estructuras ubicadas en zonas de amenaza sísmica alta, presentando variación en el periodo fundamental, cambio en la respuesta modal, incremento de derivas y disminución en el cortante de base. Además, se encontró que también afecta el método de análisis utilizado para el diseño. This paper evaluates the influence of Soil-Structure Interaction (SSI) on the linear structural response of regular wall-frame systems representative of Bucaramanga-Colombia using the substructure approach proposed by Winkler. Information was collected from existing local systems study using official databases. Using the 22 factorial design of experiments, nine artificial buildings were created with different soil types and number of floors. These buildings were designed and detailed under the fixed base idealization, following the local seismic-resistant regulations. Analyses were carried out including and excluding the ISE. The results revealed that the ISE had a significant influence on the linear response of structures located a high seismic hazard zone, presenting variation in the fundamental period, change in the modal response, increase in drifts and decrease in the base shear. In addition, it was found that it also affects the analysis method for the design.

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“…Similar formulas could be found in FEMA ( 2005) and ASCE (2005). Through a series of impact hammer tests on steel frames, these formulas were checked by Vivek and Raychowdhury (2017). They show that FEMA provisions generally tend to overestimate the response.…”

Section: Introductionmentioning

confidence: 99%

Influence of soil–structure interaction on the fundamental frequency of shear wall structures

et al. 2020

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Numerous studies indicate that soil-structure interaction has a great influence on the dynamic characteristic of buildings. This study presents an analysis of the effect of soil-structure interaction (SSI) on the natural frequency of shear wall building structures. The system is modeled by a 3D finite element model and using elastic discrete springs to represent the soilstructure interaction. A parametric study for different soil profiles is performed on one-storey building followed by a generalization on multi-storey buildings. Analysis of the results leads to the definition of the relative soil-structure parameter K ss for this type of structures. A multi-regression analysis allows to set up a dimensionless chart for the assessment of the fundamental frequency of shear wall building structures.

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Influence of SSI on Period and Damping of Buildings Supported by Shallow Foundations on Cohesionless Soil

Cited by 17 publications

References 24 publications

Effect of Non-Linear Soil Structure Interaction in Seismic Response of Asymmetric Structures

Effect of Non-Linear Soil Structure Interaction in Seismic Response of Asymmetric Structures

Análisis comparativo en la respuesta lineal de sistemas estructurales muro-pórtico representativos de Bucaramanga incorporando interacción suelo estructura

Influence of soil–structure interaction on the fundamental frequency of shear wall structures

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