Time-Dependent Deformation of Pultruded Fiber Reinforced Polymer Composite Columns

Choi, Youn‐Hee; Yuan, Rui

doi:10.1061/(asce)1090-0268(2003)7:4(356)

Cited by 16 publications

(7 citation statements)

References 5 publications

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“…[26][27][28][29][30][31] Equation (1) shows the general expression for Findley's power law formulation, where " is the total strain in a material, is the applied stress, t is the time elapsed after load application, m is the creep amplitude, n is the time exponent, " 0 e is the reference instantaneous strain, e is reference stress level associated with " 0 e , m 0 is the reference transient creep amplitude and m is the reference stress level associated with m 0 :…”

Section: Findley's Power Law General Formulationmentioning

confidence: 99%

Creep behaviour of sandwich panels with rigid polyurethane foam core and glass-fibre reinforced polymer faces: Experimental tests and analytical modelling

Garrido

Correia

Branco

et al. 2013

Journal of Composite Materials

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This paper presents experimental and analytical investigations about the creep behaviour of sandwich panels comprising glass-fibre reinforced polymer faces and rigid polyurethane foam core for civil engineering applications. A full-scale sandwich panel was tested in bending for a period of 3600 h, in a simply supported configuration, subjected to a uniformly distributed load corresponding to 20% of the panel's flexural strength. Additionally, specimens of polyurethane foam core were tested in shear for a period of 1200 h, for three different load levels corresponding to 10%, 20% and 30% of the foam's shear strength. Experimental results were fitted using Findley's power law formulation. Creep coefficients, shear modulus reduction factors and time-dependent shear moduli were obtained for the polyurethane foam in shear. A composed creep model is proposed to simulate the sandwich panel's long-term creep deformations by considering the individual viscoelastic contributions from (1) the core material in shear and (2) the glass-fibre reinforced polymer faces in tension/compression. The composed creep model predictions adequately reproduced the full-scale panel's experimental results. In addition, a good agreement was found between the composed creep model predictions and the extrapolation of the power law fitting obtained from the full-scale panel test, for a 50-year period.

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Section: Findley's Power Law General Formulationmentioning

confidence: 99%

Creep behaviour of sandwich panels with rigid polyurethane foam core and glass-fibre reinforced polymer faces: Experimental tests and analytical modelling

Garrido

Correia

Branco

et al. 2013

Journal of Composite Materials

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“…A structure being constantly loaded can experience time-dependent deformation. 454 This phenomenon is called creep. The history of FRP-pultruded elements' application is relatively short, which narrows the knowledge about their behavior at creep.…”

Section: Creepmentioning

confidence: 99%

Pultruded materials and structures: A review

Vedernikov

Safonov

Tucci

et al. 2020

Journal of Composite Materials

149

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Currently, the application of pultruded profiles is increasing owing to their advantages, such as light weight, high strength, improved durability, corrosion resistance, ease of transportation, speed of assembly, and nonmagnetic/nonconductive characteristics. This review analyzes the main application fields of elements produced by pultrusion manufacturing processes: bridges and bridge decks, cooling towers, building elements and complete building systems, marine construction, transportation, and energy systems. Analysis of the scientific literature in relation to the mechanical behavior of pultruded elements is presented as well. Finally, this review outlines the future study possibilities, giving the researchers and practitioners the directions for deeper investigation of specific features and exploration of new ones concerning the mentioned aspects of pultruded fiber-reinforced polymer composites.

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“…Owing to its simplicity, Findley's power law is the most commonly applied mathematical model for analyzing the long-term creep behavior of reinforced composite materials under constant stress [32][33][34]36,[43][44][45][46]. The creep behavior of any FRP material under constant stress can be expressed as…”

Section: Evaluation Of Creep and Viscoelastic Modelling Utilizing Finmentioning

confidence: 99%

“…To evaluate the time-dependent viscoelastic modulus and determine the accuracy E xt for the HFRP bars, we can apply the long-term design equation proposed by Scott and Zureick [44]. First, we rewrite Equation 8as:…”

Section: Design Formulation and Verification For Viscoelastic Modulusmentioning

confidence: 99%

Experimental Study on the Flexural Creep Behaviors of Pultruded Unidirectional Carbon/Glass Fiber-Reinforced Hybrid Bars

et al. 2020

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Unidirectional pultruded glass/carbon hybrid fiber-reinforced polymer (HFRP) bars with a diameter of 19 mm have recently been developed for various structural applications. In this study, the creep behavior of HFRP bars caused by bending was experimentally evaluated under different conditions. Our creep study included freeze–thaw preconditioned and unconditioned HFRP bars. The rate of strain and deflection were monitored continuously for a duration of 5000 h. The bars were further tested for creep under the combined effects of mechanical loading and induced thermal cycles, while continuously monitoring the strain rate. Stress levels of 50% to 70% were selected for our creep study. The creep behavior of the bars was analyzed utilizing Findley’s power-law model. On the basis of the linear approximation of Findley’s power law, modulus reductions of approximately 21%, 19%, and 10.75% were calculated for combined freeze–thaw/creep-loaded, freeze–thaw pretreated, and unconditioned HFRP bars, respectively, over a service period of 50 y. The time-dependent deflection of HFRP bars was analyzed by coupling Findley’s power-law model with Euler Bernoulli’s beam theory. The creep deflection intensified by 26.6% and 11.1% for preconditioned and untreated bars, respectively, after a service period of 50 y. The microstructures of HFRP bars was also examined utilizing scanning electron microscopy.

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Time-Dependent Deformation of Pultruded Fiber Reinforced Polymer Composite Columns

Cited by 16 publications

References 5 publications

Creep behaviour of sandwich panels with rigid polyurethane foam core and glass-fibre reinforced polymer faces: Experimental tests and analytical modelling

Creep behaviour of sandwich panels with rigid polyurethane foam core and glass-fibre reinforced polymer faces: Experimental tests and analytical modelling

Pultruded materials and structures: A review

Experimental Study on the Flexural Creep Behaviors of Pultruded Unidirectional Carbon/Glass Fiber-Reinforced Hybrid Bars

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