Pushover analysis for flexible and semi‐flexible pile‐supported wharf structures accounting the dynamic magnification factors due to torsional effects

Zacchei, Enrico; Lyra, Pedro H. C.; Stucchi, Fernando Rebouças

doi:10.1002/suco.202000137

Cited by 5 publications

(5 citation statements)

References 37 publications

(52 reference statements)

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“…( 13)). Equation ( 2 non-structural elements (Zacchei et al 2020), whereas ξ d can be estimated more easily since dampers are construct in laboratory, their sizes are small, and the material is homogeneous.…”

Section: Methodsmentioning

confidence: 99%

Semi-active tuned mass dampers under combined variable actions of friction forces and external disturbances

Zacchei

Brasil

2023

Arab J Geosci

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Anti-seismic devices are employed to implement the best performance of the structures under earthquakes. In this paper, semi-active tuned mass dampers (SA-TMDs) are studied by considering several combinations of variable friction forces and external disturbances. The variable damping model is used, where the goal consists in estimating the external actions to find the best friction force for system dampening. In particular, general, sinusoidal, and Gaussian dynamic loadings are considered. To obtain the response of the structure and dampers, several numerical solutions have been implemented. Probabilistic and determines analyses have been also developed to study different damper characteristics. Results show that a SA-TMD can reduce the structure displacements up to ~ 70.0% indicating a good performance in controlling different oscillations. This technology not only preserves the integrity of a structure mitigating its vibrations but also improves the life of occupants and their safety and comfort. This is beneficial from the perspective of practical application, and it is an advancement with respect to this theme.

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Section: Methodsmentioning

confidence: 99%

Semi-active tuned mass dampers under combined variable actions of friction forces and external disturbances

Zacchei

Brasil

2023

Arab J Geosci

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“…The pushover analysis was performed in the 2D FB-FEA, FA-1, and FA-2 models, considering the corrosion effect up to 75 years and constant gravity loads (P = 100 kN). Furthermore, the lateral load (F push ) was applied as a series of displacement-based loads [59] implemented on the top edge of the deck in 1 mm increments until the target displacement was reached. The target displacement was the horizontal displacement of the node at the top of piles A1 and B1 (Figure 9).…”

Section: Pushover Analysismentioning

confidence: 99%

Simplified Method for Nonlinear Seismic Response Analysis of Corroded Pile-Supported Wharf

Refani,

Nagao

2023

Applied Sciences

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Fiber-based finite element analysis (FB-FEA) has been widely recognized for its ability to reproduce experimental results and is also a reliable method for evaluating the nonlinear seismic response of pile-supported wharves (PSWs). Design practice often employs frame analysis (FA) due to its easy implementation. To precisely reproduce the nonlinear seismic response of PSW using FA, it is necessary to configure mechanical properties such as the hinge property correctly. However, it is unclear whether the hinge properties proposed in previous studies can be applied to PSWs with spun piles. In this study, a novel FA method was developed to investigate the nonlinear seismic response of PSWs with corroded spun piles considering PC bar area reduction, deteriorated material properties, the bending stiffness reduction factor, and the moment–curvature relationship of the spun pile. The nonlinear seismic response of corroded PSWs was determined by performing pushover analysis using three methods: FA using the method of the previous study (FA-1), the proposed FA method (FA-2), and FB-FEA. As regards PSW foundations, vertical pile and batter pile configurations were considered. The pushover analysis results were compared in terms of several parameters, such as the natural period, plastic hinge formation, and load capacity of the corroded PSWs. The FA-2 results agreed very well with the FB-FEA results, while the FA-1 results were less precise with respect to the natural periods and load capacities of corroded PSWs. The results indicated that the bending stiffness reduction factor, moment–curvature relationship, and axial load–bending moment (P–M) capacity of the corroded spun piles should be appropriately defined. Corrosion had greater negative impacts on the compressive axial load and bending moment capacities of the spun pile than on its tensile axial load capacity.

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“…This interest exists regarding the seismic hazard for nuclear power plants 16 as well as other constructions of great sizes, for example, dams and bridges. 52 Moreover, many companies work on projects outside Brazil where they must deal with such issues as, for example, the port in Venezuela where the authors of this article have participated to the design as shown in Zacchei et al 36 2 | STRUCTURAL MODEL…”

Section: Motivation Of This Studymentioning

confidence: 99%

“…The structural analysis carried out in this study is elastic, that is, the used static forces are equivalent to the elastic dynamic forces of fixed-base structures. In this sense, for instance, the effects of eccentricities due to lateral torsions that increase the structure response studied in other works 35,36 are not considered.…”

Section: Introduction 1| Backgroundmentioning

confidence: 99%

Recalibration of low seismic excitations in Brazil through probabilistic and deterministic analyses: Application for shear buildings structures

Zacchei

Lyra

2022

Structural Concrete

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Brazil has a low level of seismicity compared to several other regions in the world; however, some significant earthquakes occurred. In this article, four techniques have been used to define new seismic inputs: probabilistic seismic hazard, elastic spectra, synthetic spectra, and artificial accelerograms. To carry out the probabilistic analysis, new seismogenic zones for southeast Brazil established in 2018 have been implemented. Elastic response spectra follow the Brazilian code, whereas the synthetic response spectra have been defined by using attenuation equations. Finally, the artificial accelerograms have been developed using analytical models. Modified Brazilian elastic response spectra by considering the results of the probabilistic seismic hazard analyses are proposed. Artificial accelerations, consistent to the non‐modified and modified elastic response spectra, show that for non‐modified spectra the structural response increases of ~2.50 times. Data for seismogenic zones and specific analytical equations to obtain the probability of non‐exceedance of the spectral accelerations have been adapted for this study. An application for shear buildings was analyzed.

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Pushover analysis for flexible and semi‐flexible pile‐supported wharf structures accounting the dynamic magnification factors due to torsional effects

Cited by 5 publications

References 37 publications

Semi-active tuned mass dampers under combined variable actions of friction forces and external disturbances

Semi-active tuned mass dampers under combined variable actions of friction forces and external disturbances

Simplified Method for Nonlinear Seismic Response Analysis of Corroded Pile-Supported Wharf

Recalibration of low seismic excitations in Brazil through probabilistic and deterministic analyses: Application for shear buildings structures

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