scholarly journals Effects of Stratification on Soil–Foundation–Structure Interaction: Centrifugal Observation and Numerical Simulation

2021 ◽  
Vol 11 (2) ◽  
pp. 623
Author(s):  
Van-Linh Ngo ◽  
Changho Lee ◽  
Jae-Min Kim
Keyword(s):  
Soft Soil ◽  
Free Field ◽  
Soil Layer ◽  
Structure Interaction ◽  
Centrifuge Tests ◽  
Shear Beam ◽  
Soil Foundation ◽  
Input Motion ◽  
Layered Ground ◽  
Foundation Structure

It is essential to reduce structural damages caused by earthquakes in severe conditions, such as layered ground, especially when a soft soil layer is close to the surface. In this study, the kinematic and inertial interactions, two mechanisms of soil–foundation–structure interaction (SFSI), of different soil–foundation–structure systems (SFS) were investigated on uniform and layered grounds. Two layered soil profiles composed of a low stiffness layer laid over another were prepared in an equivalent shear beam container. Nine centrifuge experiments were carried out for three structures located on the surface of each ground and exposed to the Hachinohe earthquake while increasing the peak acceleration of the input motion. Numerical simulations were performed to simulate the centrifuge tests. It was found that roof motion (RM) of the tall structure increased in layered profile even though the free-field motion (FFM) decreased compared to homogeneous ground. The appearance of a soft layer beneath structures modifies the SFS system’s stiffness that causes kinematic and inertial interactions to alter to those on uniform soil profile.

Effect of Ground Motion Characteristics on Seismic Soil-Foundation-Structure Interaction

2015 ◽  
Vol 31 (3) ◽  
pp. 1789-1812 ◽  
Author(s):  
Majid Ghayoomi ◽  
Shideh Dashti
Keyword(s):  
Ground Motion ◽  
Free Field ◽  
Time History ◽  
Natural Period ◽  
Dense Sand ◽  
Structure Interaction ◽  
Flexible Base ◽  
Soil Foundation ◽  
Motion Characteristics ◽  
Foundation Structure

A series of dynamic centrifuge experiments involving a soil-structure model were performed to investigate the influence of ground motion characteristics on site performance and soil-foundation-structure interaction (SFSI) on medium-dense sand. When investigating kinematic SFSI, the translational component of the foundation motion was observed to de-amplify compared to the free-field in terms of most intensity parameters primarily during intense shaking and at higher frequencies. The building's fundamental rocking frequency was strongly influenced by the predominant frequency of the base motion. When investigating inertial SFSI, increasing the shaking intensity was observed to increase the flexible-base natural period of the structure. Spectral accelerations at the foundation level were significantly amplified near the building's flexible-base natural period. Structural settlements were greater than those in the free-field, and their rate followed the rate of the Arias intensity time history of the base motion. More holistic ground motion parameters, such as Arias and Housner Intensities, demonstrated a strong and consistent influence on SFSI and site performance.

Fragility curve modifiers for reinforced concrete dual buildings, including nonlinear site effects and soil–structure interaction

2020 ◽  
Vol 36 (4) ◽  
pp. 1930-1951 ◽  
Author(s):  
Christos Petridis ◽  
Dimitris Pitilakis
Keyword(s):  
Reinforced Concrete ◽  
Soil Structure ◽  
Soft Soil ◽  
Soil Structure Interaction ◽  
Soil Profiles ◽  
Soil Behavior ◽  
Structure Interaction ◽  
Nonlinear Soil Behavior ◽  
Soil Foundation ◽  
Foundation Structure

We investigate the influence of soil–structure interaction (SSI) and nonlinear soil behavior on the seismic fragility of reinforced concrete (RC) dual (frame + shear wall) buildings resting on shallow foundations. This article includes a holistic methodology to account for nonlinear soil behavior and soil–foundation–structure interaction in a modular way. Using nonlinear dynamic analyses, we derive fragility curves for a wide set of building typologies and soil profiles, showing that soil behavior during strong shaking significantly affects the vulnerability of the soil–foundation–structure system. The influence of SSI is pronounced mostly for soft soil profiles, varying in a building-specific way. Post-processing of our results evolves into a set of fragility modifiers that enable risk analysts to massively account for soil-related and/or SSI effects in large-scale risk assessments.

Soil-Foundation-Structure Behavior at the Oakland Outer Harbor Wharf

1996 ◽  
Vol 1546 (1) ◽  
pp. 100-111
Author(s):  
G. Norris ◽  
R. Siddharthan ◽  
Z. Zafir ◽  
S. Abdel-Ghaffar ◽  
P. Gowda
Keyword(s):  
Pile Foundation ◽  
Free Field ◽  
Strong Motion ◽  
Structural Failure ◽  
Loma Prieta ◽  
Soil Foundation ◽  
Batter Piles ◽  
Foundation Structure

The California Strong Motion Instrumentation Program's Loma Prieta records at Oakland Outer Harbor Wharf maybe used to study the free-field motions, the possible softening of soils surrounding the piles supporting the instrumented wharf, the determination of the motion on the instrumented wharf using free-field motion input and deflection-compatible lateral and vertical pile foundation stiffnesses, and conditions under which a soil-foundation interaction failure or structural failure of the batter piles might have developed.

Relevance of Dynamic Soil-Foundation-Structure Interaction for Pile-Supported Buildings

2020 ◽  
Vol 146 (6) ◽  
pp. 04020034
Author(s):  
Luca de Sanctis ◽  
Maria Iovino ◽  
Raffaele Di Laora ◽  
Stefano Aversa
Keyword(s):  
Structure Interaction ◽  
Soil Foundation ◽  
Foundation Structure

Nonlinear Soil–Foundation–Structure and Structure–Soil–Structure Interaction: Engineering Demands

2015 ◽  
Vol 141 (7) ◽  
pp. 04014177 ◽  
Author(s):  
Nicholas W. Trombetta ◽  
H. Benjamin Mason ◽  
Tara C. Hutchinson ◽  
Joshua D. Zupan ◽  
Jonathan D. Bray ◽  
...  
Keyword(s):  
Soil Structure ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Soil Foundation ◽  
Foundation Structure
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