Numerical modelling of concrete beams reinforced with pre-stressed CFRP

Neto, Pedro; Alfaiate, J.; Vinagre, João

doi:10.1007/s10704-008-9292-5

Cited by 7 publications

(6 citation statements)

References 16 publications

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“…(2) P. Neto [9] and others analyzed and compared the test results of prestressed CFRP reinforced concrete beams by using the numerical simulation, the simulation was conducted with the method of discrete fracture modeling, at the same time, using the method of non linear iterative sequence in order to avoid causing problems such as convergence, finally the results of numerical simulation tally well with the test results.…”

Section: The Current Research Status Of Related Fields At Home and Abmentioning

confidence: 92%

New Exploration of CFRP prestressed equipment

Xu¹,

Zhao²

2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

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CFRP is widely used in the area of reinforcement because of its many advantages, but ordinary methods of past can not give full play to high-strength properties of CFRP.Therefore, new technology of concrete structures strengthened with prestressed CFRP emerges as the times require. At the same time,the prestressed tensioning equipment as the main construction tools has become a top priority. In this paper, we explored a new set of CFRP prestressed equipment, which is suitable for laboratory use through a comparative study of the existing applying ways and tensioning equipment of prestressed CFRP,and made use of the equipment to conduct the experimental research on strengthening concrete beams with prestressed CFRP.Experiment shows that the concrete beams strengthened with prestressed CFRP improved more significantly than the ones strengthened with ordinary CFRP in the aspects such as the bearing capacity. Thus it can be seen that the reinforcement effect is good, and the equipment can be further studied and applied to practical engineering.

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Section: The Current Research Status Of Related Fields At Home and Abmentioning

confidence: 92%

New Exploration of CFRP prestressed equipment

Xu¹,

Zhao²

2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

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“…Yet, e.g. the mentioned Newton-Raphson may not rely on existence of some potentials and then such a fully implicit scheme can be considered, even for p > 1 since the last term in (29) and its estimation (35) below would be avoided.…”

Section: Coupled Implicit Time Discretisationmentioning

confidence: 99%

“…Especially the former option is explicitly reported in literature as unreliable in the context of damage or phase-field crack models, cf. [6,13,35,44,48,49], although one can even find an opposite (not correct in general) belief and a (rather particular) experience that a fully coupled monolithic solution can even prevent numerical instabilities or converges, cf. e.g.…”

Section: Introductionmentioning

confidence: 99%

Coupled time discretization of dynamic damage models at small strains

Roubíček

2019

IMA Journal of Numerical Analysis

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The dynamic damage model in viscoelastic materials in Kelvin–Voigt rheology is discretized by a scheme that is coupled, suppresses spurious numerical attenuation during vibrations and has a variational structure with a convex potential for small time steps. In addition, this discretization is numerically stable and convergent for the time step going to zero. When combined with a finite-element spatial discretization, it leads to an implementable scheme and to that iterative solvers (e.g., the Newton–Raphson) used for the nonlinear algebraic systems at each time level have guaranteed global convergence. Models that are computationally used in some engineering simulations in a nonreliable way are thus stabilized and theoretically justified in this viscoelastic rheology. In particular, this model and algorithm can be used in a reliable way for a dynamic fracture in the usual phase-field approximation.

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“…The result in finite element analysis is shown as dashed lines in Figure 13, which match well with the experiment result with a difference of 2.18% in mid-span and 6.36% in L/4 section. The difference is supposed to be due to the simplification of the model, for example, no relative slippage between concrete and reinforcement was considered [36], and the material constitutive equations were simplified as well. However, the difference is really small, so the finite element analysis model is considered to have been validated.…”

Section: Displacement and Stiffnessmentioning

confidence: 99%

Fatigue Behavior of Prestressed Concrete Beam for Straddle-Type Monorail Tracks

Wang

Gou

et al. 2018

Applied Sciences

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Monorail transportation systems are widely built in medium and small cities, as well as hilly cities, because of their excellent performance. A prestressed concrete track beam is a key load-carrying structural component and guideway subjected to repeated traffic load. The fatigue behavior of the prestressed concrete beam is critical for the safety of the transportation system. This paper presents the results of an experimental study on the fatigue behavior of a prestressed concrete beam in terms of stiffness degradation and strain change. The displacement and rotation of the beam of concrete and reinforcement were examined, respectively. A three-dimensional finite element model was established to help understand the development of the mechanical behavior. No crack was observed throughout the test. Both concrete and bars behaved in their linear-elastic stage throughout the test, and the bond between them performed well.During the last decade, a large amount of theoretical and experimental research has been proposed to investigate the fatigue behavior and mechanism of the PC beam in detail [10][11][12]. Harajli and Naaman [13] found that the fatigue life of PC beams is related to the degree of prestressing, the longitudinal reinforcement ratio, and the strength of concrete. Feng et al. [14] found that cracking and deflection changed rapidly in the initial stage of fatigue, and changed stably afterwards until failure. Wollmann [15] carried out an experimental investigation of the fatigue strength of post-tensioned concrete girders, finding that fatigue failure occurred in the vicinity of cracks. Li et al. [16] analyzed the evolution of the fatigue failure pattern of PC beams and regularities of midspan deflection and strain of concrete of PC beams. However, most of the studies focused on the fatigue behavior of partially-prestressed concrete beams [17] and beams strengthened with carbon fiber-reinforced plastics sheets [18][19][20][21]. However, there is no research on fatigue behavior of fully prestressed concrete beams. The primary reason is that fully prestressed concrete beams are considered not susceptible to fatigue damage due to the applied full prestressing force. However, fully prestressed concrete beams can be turned into partially prestressed concrete beams under the effects of overloading or other extreme events. Moreover, cracks are not allowed in fully prestressed concrete beams under service loads, which is different from partially prestressed concrete beams.Model tests and in situ tests have been considered as effective approaches to investigate mechanical performances of structures [22][23][24][25][26][27][28][29][30]. In this study, a full-scale fatigue test of a prestressed concrete beam was carried out. Displacement, rotation, strain of concrete, and reinforcement were examined under post-fatigue static loading condition. A three-dimensional finite element model was established to understand stress distributions. Experimental Program MaterialsA PC beam was fabricated to represent the typical PC t...

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Numerical modelling of concrete beams reinforced with pre-stressed CFRP

Cited by 7 publications

References 16 publications

New Exploration of CFRP prestressed equipment

New Exploration of CFRP prestressed equipment

Coupled time discretization of dynamic damage models at small strains

Fatigue Behavior of Prestressed Concrete Beam for Straddle-Type Monorail Tracks

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