A centrifuge-based experimental verification of Soil-Structure Interaction effects

Martakis, Panagiotis; Taeseri, Damoun; Chatzi, Eleni; Laue, Jan

doi:10.1016/j.soildyn.2017.09.005

Cited by 33 publications

(20 citation statements)

References 22 publications

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“…in which C is a constant and λ is eigenvalue. Substituting Equation (8) into Equation 7leads to the algebraic equation:…”

Section: The Virtual Initial Condition For Free Vibrationmentioning

confidence: 99%

“…Hysteretic damping, whose force is proportional to the displacement and in phase with the velocity, leads to a dissipated energy per cycle which is independent of the frequency [4,5]. Experiments on structural materials indicate that the energy dissipation is independent of the cyclic frequency [6][7][8]. In those cases, the hysteretic damping is more precise.…”

Section: Introductionmentioning

confidence: 99%

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The Direct Integration Method with Virtual Initial Conditions on the Free and Forced Vibration of a System with Hysteretic Damping

Pan

2019

Applied Sciences

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The energy dissipated in hysteretic damping is independent of cyclic frequency, which agrees with the experimental results of energy dispersion of many materials under cyclic loading. Despite these desirable properties, hysteretic damping suffers from a notable drawback; the direct integration solution of the equation of motion is divergent. In this paper, a virtual initial condition is proposed to address the instability of the solution. The new method develops virtual initial conditions associated to the real initial conditions, which make the direct integration solution eliminate the divergence term of the complementary solution and converge to the exact solution. The stability and accuracy of the proposed direct integration method are demonstrated to be effective in solving the divergence problem by the comparison of the numerical and theoretical solutions on the free and forced vibration of a system with hysteretic damping.

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“…in which C is a constant and λ is eigenvalue. Substituting Equation (8) into Equation 7leads to the algebraic equation:…”

Section: The Virtual Initial Condition For Free Vibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Direct Integration Method with Virtual Initial Conditions on the Free and Forced Vibration of a System with Hysteretic Damping

Pan

2019

Applied Sciences

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“…The prevailing view about the beneficial effect of SSI by lengthening the structural period and consequentially resulting in a reduction of seismic demand has been challenged by various researchers (Mylonakis & Gazetas, 2000;Sextos et al, 2003;Lesgidis et al, 2017), who demonstrated that SSI may not be always beneficial. SSI effect has been researched theoretically (Wolf, 1985), through laboratory experiments (Pitilakis et al, 2008;Sextos et al, 2016;Martakis et al, 2017), field testing and onsite measurements (Kawashima 1980;Chaudhary et al, 2001;Hogan & Wotherspoon, 2014) and numerical simulations (Spyrakos, 1990;Papadopoulos et al, 2018). Although inclusion of SSI is not required for seismic design, its incorporation and fine-tuning of soil-foundation impedance is one of the important part in the FEM model updating process for reducing error between the values of recorded and numerical FEM modal parameters.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of modal parameters of multi-span bridges to SSI and pier column inelasticity and its implications for FEM model updating

Chaudhary

2020

Lat. Am. j. solids struct.

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Modal parameters, determined through forced vibration testing, ambient vibrations or seismic excitations, are central to the structural health monitoring process for bridges. These parameters are used to obtain highfidelity numerical models through FEM model updating by fine-tuning mass, stiffness and boundary conditions and matching the numerical and observed modal parameters. This study investigated sensitivity of modal parameters to changes in boundary conditions (soil-structure interaction effect) and pier column inelasticity (stiffness effect) through more than 450 non-linear dynamic time-history analysis of an ordinary multi-span bridge. The bridge system was founded on shallow foundations in five rock profiles and on pile foundations in five soil profiles and was subjected to 21 seismic ground motions of varying intensity (0.036 to 0.61g). Modal frequencies showed sensitivity to the SSI and pier column inelasticity effects for low and higher levels of seismic excitations respectively. Mode shapes, on the contrary, were insensitive to SSI as well as pier column inelasticity for all levels of seismic excitations.

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“…In most studies, the stiffness of the soil was simulated by the "p-y" method according to the API code [8], although some researchers noted that the API model may lead to the overestimation of pile-soil stiffness [2,9]. Secondly, many research efforts are placed on the establishment and improvement of the soil-structure interaction (SSI) model for finite element analysis (FEA), based on the test results [10][11][12][13]. Many kinds of nonlinear spring models were proposed to simulate the dynamic soil-structure interaction: distributed spring model [9,11], three-spring model (lateral spring, rotational spring and vertical spring [12], four-spring model (lateral spring, rotational spring, rotational-lateral coupled spring and vertical spring) [2,5] and simplified lumped mass SDOF model [13].…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12][13] Many kinds of nonlinear spring models were proposed to simulate the dynamic soil-structure interaction: distributed spring model, 9,11 three-spring model (lateral spring, rotational spring and vertical spring), 12 four-spring model (lateral spring, rotational spring, rotational-lateral coupled spring and vertical spring) 2,5 and simplified lumped mass singledegree-of-freedom (SDOF) model. 13 Based on the scaled model test and the FEA results, the following conclusion was drawn: long-term cyclic loading may cause either stiffening or softening of the soil around the pile foundation of an OWT, that is, stiffening for the sandy soil 9, [14][15][16][17][18] and softening for the clayey soil. 2,3,19 Structural health monitoring (SHM) has been recognized internationally as an effective way to enhance structural reliability and resilience, which enables the assessment of structural conditions and early detection of potential component failures.…”

Section: Introductionmentioning

confidence: 99%

Support condition monitoring of offshore wind turbines using model updating techniques

Nikitas

Zhang

et al. 2019

Structural Health Monitoring

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The offshore wind turbines are dynamically sensitive, whose fundamental frequency can be very close to the forcing frequencies activated by the environmental and turbine loads. Minor changes of support conditions may lead to the shift of natural frequencies, and this could be disastrous if resonance happens. To monitor the support conditions and thus to enhance the safety of offshore wind turbines, a model updating method is developed in this study. A hybrid sensing system was fabricated and set up in the laboratory to investigate the long-term dynamic behaviour of the offshore wind turbine system with monopile foundation in sandy deposits. A finite element model was constructed to simulate structural behaviours of the offshore wind turbine system. Distributed nonlinear springs and a roller boundary condition are used to model the soil–structure interaction properties. The finite element model and the test results were used to analyse the variation of the support condition of the monopile, through an finite element model updating process using estimation of distribution algorithms. The results show that the fundamental frequency of the test model increases after a period under cyclic loading, which is attributed to the compaction of the surrounding sand instead of local damage of the structure. The hybrid sensing system is reliable to detect both the acceleration and strain responses of the offshore wind turbine model and can be potentially applied to the remote monitoring of real offshore wind turbines. The estimation of distribution algorithm–based model updating technique is demonstrated to be successful for the support condition monitoring of the offshore wind turbine system, which is potentially useful for other model updating and condition monitoring applications.

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A centrifuge-based experimental verification of Soil-Structure Interaction effects

Cited by 33 publications

References 22 publications

The Direct Integration Method with Virtual Initial Conditions on the Free and Forced Vibration of a System with Hysteretic Damping

The Direct Integration Method with Virtual Initial Conditions on the Free and Forced Vibration of a System with Hysteretic Damping

Sensitivity of modal parameters of multi-span bridges to SSI and pier column inelasticity and its implications for FEM model updating

Support condition monitoring of offshore wind turbines using model updating techniques

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