Summary of discussion session 1

Pender, Michael; Anastasopoulos, Ioannis; Carr, Ashley; Chin, Craig; Chouw, Nawawi; Deam, B.; Iai, Susumu; Jamieson, G. H.; Jeremić, Biljana; Kutter, Bruce L.; Lai, Chin Yuan; Lam, Ineke; Pappin, J.; Pecker, Alain; Poulos, Harry G.; Prakash, Suraj; Sritharan, Subramania I.; Stokoe, Kenneth H.; Sullivan, Tim; Taciroglu, E.; Tamagnini, Claudio

doi:10.1201/b10568-29

Soil-Foundation-Structure Interaction 2010

DOI: 10.1201/b10568-29

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Summary of discussion session 1

Michael Pender¹,

Ioannis Anastasopoulos²,

Ashley Carr³

et al.

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“…Paolucci et al [20][21][22] proposed equivalent damping curve that related to the rotational stiffness degradation curves. Studies in the similar direction are available in the literature [23][24][25][26][27][28]4]. Numerical studies concerning the stiffness degradation and damping of shallow foundaitons were also conducted by researchers.…”

mentioning

confidence: 94%

Study on the stiffness degradation and damping of pile foundations under dynamic loadings

Li¹,

Escoffier²,

Kotronis

2020

Engineering Structures

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This paper presents a comprehensive study on the different behaviour of batter and vertical pile foundations in terms of stiffness degradation and damping properties under dynamic loadings. Firstly, dynamic centrifuge tests were carried out and the variations of translational/rotational stiffness and the associated damping properties were identified from a series of hysteretic loops. Results show that for the rocking behaviour, the presence of batter piles causes a small decrease of the rotational stiffness and a great increase of the rotational damping; for the horizontal translation behaviour, batter pile foundation has much higher horizontal stiffness and translational damping compared to the vertical foundation. Then, a set of stiffness degradation and damping curves for the translational and rotational behaviour of batter and vertical pile foundations are proposed. Finally, the proposed stiffness degradation and damping curves were validated numerically by using equivalent linear approach. The numerical validation shows a good agreement with the experimental results.

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mentioning

confidence: 94%

Study on the stiffness degradation and damping of pile foundations under dynamic loadings

Li¹,

Escoffier²,

Kotronis

2020

Engineering Structures

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Effects of nonlinear soil–structure-interaction on seismic damage of 3D buildings on cohesive and frictional soils

Sotiriadis

Kostinakis

Morfidis

2017

Bull Earthquake Eng

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Effect of Uplift and Soil Nonlinearity on Plastic Hinge Development and Induced Vibrations in Structures

Qin

Chen

Chouw

2013

Advances in Structural Engineering

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Earthquakes may cause separation at the interface of the footing and the supporting ground. When a structure vibrates the contact interface between the footing and the soil is reduced. Because of the concentration of stress in the remaining contact area the soil beneath the footing can deform plastically. In this experimental study, the effect of footing uplift and soil plastic deformation on the development of a plastic hinge in the structure was investigated. A small scale model, with uplift permitted, was subjected to shake table excitations to simulate the seismic response of the prototype structure. To scale the structure a reformulated Cauchy number was developed. While the ductile behaviour of the structure was simulated by installing an artificial plastic hinge in the model, the potential for footing settlement was included by utilising a box of sand. The ground excitations were simulated based on Japanese design spectra that incorporate different frequency content. The combined effect of footing uplift, foundation soil plastic deformation and structural ductile behaviour on the induced vibrations is discussed.

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Summary of discussion session 1

Cited by 3 publications

References 1 publication

Study on the stiffness degradation and damping of pile foundations under dynamic loadings

Study on the stiffness degradation and damping of pile foundations under dynamic loadings

Effects of nonlinear soil–structure-interaction on seismic damage of 3D buildings on cohesive and frictional soils

Effect of Uplift and Soil Nonlinearity on Plastic Hinge Development and Induced Vibrations in Structures

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