The use of pseudo-dynamic method in the evaluation of damping characteristics in reinforced concrete beams having variable bending stiffness

Carneiro, Joaquim A. O.; deMelo, F.J.Q.; Jalali, Saíd; Teixeira, Viriato; Tomás, Miguel

doi:10.1016/j.mechrescom.2005.05.010

Cited by 7 publications

(5 citation statements)

References 5 publications

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“…The striker kinetic energy at the contact point is absorbed by the affected structure, the speed decreases since an initial value, naturally increasing the specimen deformation. The PSD numerical formulation is based on the momentum theorem (Carneiro et al, 2006;, ). The technique may be summarized as follows: at instant t, the impulse force at time increment Δt is equal to the variation of the quantity of motion of the striking mass.…”

Section: Ijsi 141mentioning

confidence: 99%

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Evaluation of a coach door under a frontal impact

Lopes

Barros

Melo

et al. 2022

IJSI

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PurposeThe vehicle´s body front pillar should absorb most of the striker kinetic energy, while only a fraction of that is absorbed by the door structure. This study aims to discuss the aforementioned issue. In this test the striker is a virtual entity. Six uniaxial strain gauges are installed throughout the door. Additionally, contactless 3D digital image correlation (DIC) allows to assess the major door panel’s continuous deformation and strain fields.Design/methodology/approachA coach is a large and heavy long-distance passenger transport vehicle. Their structural certification, classifies coaches as M3 Class III vehicles. New coach structures’ designs need analyses of each sub-system for critical pre-validation of the entire structure, aiming driver and passenger carrier safety. Also, a thorough examination due to increased travel speed is needed.FindingsExperimental pseudo-dynamic (PSD) results were compared and validated using finite element method (FEM) with two pieces of distinct FEM software (Abaqus® and PamCrash®). The time dependent solution was carried out by explicit techniques. Results by FEM and PSD test showed good agreement, evidencing the reliability of the tools selected. Results by PamCrash® were closer to the experimental data.Practical implicationsR-29 is truck-only regulation, however can be adapted to coaches in case of a frontal collision. The present work focuses on the impact behavior of the passenger front door subsystem.Originality/valueAs a first validation the entire structure, the behavior of a vehicle door, under in-plane impacts was studied. The corresponding deformation energy absorbed by the frontal passenger coach door under virtual impacts of a swinging striker was assessed using a PSD approach.

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Section: Ijsi 141mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of a coach door under a frontal impact

Lopes

Barros

Melo

et al. 2022

IJSI

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“…This type of test is difficult to execute because it requires a good knowledge of the initial conditions (position, velocity, acceleration). Carneiro et al [7] tackle this challenge thanks to pseudo-dynamic tests allowing for a quasi-static experimental loading applied by an actuator at the tip of a RC beam deduced from a numerical dynamic simulation.…”

Section: Free Vibration Testsmentioning

confidence: 99%

Dissipations in reinforced concrete components: Static and dynamic experimental identification strategy

Heitz

Maoult

Richard

et al. 2018

Engineering Structures

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“…Developments of a mixed finite element substructure-subdomain method used in the calculations. According to the test results [53], a non-dimensional damping ratio 0.03 is used to account for the energy dissipation in the concrete structure. Figure 16 shows the first three natural modes and the corresponding natural frequencies of the tank.…”

Section: A Fixed Lng Storage Tank Subject To An Impact Loadmentioning

confidence: 99%

Developments of a mixed finite element substructure—subdomain method for fluid—structure interaction dynamics with applications in maritime engineering

Xing

Xiong

Tan

2009

Proceedings of the Institution of Mechanical Engineers, Part M:

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Theoretical development of a mixed finite element substructure—subdomain method for dynamic analysis of fluid—structure interaction systems (FSIS) with applications in maritime engineering is summarized in this paper. Governing equations for FSIS are presented. Boundary conditions for air—liquid interfaces are formulated to account for mass density discontinuity of different fluids. The frequency shift technique is demonstrated for FSIS, which establishes a basis for the design of an algorithm for the purpose of dynamic analysis of structure, fluids, and their interactions. A flow chart of the computer program is provided to better illustrate the implementation of the numerical method. Four problems in maritime engineering are simulated using the developed fluid—structure interaction analysis program (FSIAP). Problem 1 investigates the sloshing frequencies of a liquid tank and its dynamic responses to a sinusoidal base motion and El Centro earthquake excitation, respectively. Problem 2 analyses the transient response of a liquefied natural gas (LNG) tank—water system to an explosion wave in the water. Problem 3 studies a structure—acoustic—volume system subject to human footfall impacts, which may explain the ‘character’ of the footstep noise claimed by people, such as ‘thuds’, ‘thumps’, and ‘booming’. Problem 4 investigates the dynamic response of an onshore LNG storage tank subject to an impact load. The numerical results are analysed to provide the guidelines for design of maritime products involving FSIS.

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The use of pseudo-dynamic method in the evaluation of damping characteristics in reinforced concrete beams having variable bending stiffness

Cited by 7 publications

References 5 publications

Evaluation of a coach door under a frontal impact

Evaluation of a coach door under a frontal impact

Dissipations in reinforced concrete components: Static and dynamic experimental identification strategy

Developments of a mixed finite element substructure—subdomain method for fluid—structure interaction dynamics with applications in maritime engineering

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