Numerical simulation of tested reinforced concrete beams strengthened by thin fibre-reinforced cementitious matrix jackets

Georgiadi-Stefanidi, Kyriaki; Mistakidis, E.S.; Perdikaris, Philip C.; Papatheocharis, Theocharis

doi:10.12989/eas.2010.1.4.345

Cited by 4 publications

(4 citation statements)

References 25 publications

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“…The aforementioned literature review reveals that the majority of the conducted research is focused on the application of nonconventional jackets in strengthening methods of original RC structural members [17][18][19]21,22,24,[26][27][28][30][31][32][33][34]36,[38][39][40][41][42][43][44][45][48][49][50]56]. Significantly fewer studies investigate such jackets for the repair of preloaded and slightly damaged RC specimens [20,23,25,29,35,37,46,47,[51][52][53][54][55].…”

Section: Research Significancementioning

confidence: 99%

“…These reasons have led researchers to switch to new jacketing techniques with alternative materials such as steel [17][18][19], advanced materials such as fiber reinforced polymer (FRP) [20][21][22][23][24][25], textile reinforced concrete or mortar [26][27][28][29] and shape memory alloys [30][31][32], cement-based materials such as ferrocement [33][34][35][36], steel fibrous concrete or mortar [37][38][39][40], high-performance fiber reinforced concrete [41][42][43][44][45][46][47][48], self-compacting concrete (SCC) [49][50][51][52][53][54], and thin slightly reinforced flowable mortar [55,56]. Many of these jacketing techniques have been proved successful substitutes to common RC jacketing.…”

Section: Introductionmentioning

confidence: 99%

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Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

et al. 2019

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The effectiveness of slightly reinforced thin U-shaped cementitious mortar jacketing for the repair of damaged shear-critical reinforced concrete beams is experimentally investigated. The test project includes two parts. In the first one, five concrete beams over-reinforced against flexure and under-reinforced against shear with different ratio of closed stirrups were initially subjected to monotonic loading until failure. The initially tested beams have been designed to fail in shear after wide diagonal cracking and to exhibit various strength and deformation capacities along with different levels of damages. In the second experimental part, the heavily damaged beams were jacketed with mild steel small diameter U-shaped transverse stirrups and longitudinal reinforcing bars. The retrofitted specimens using the proposed jacketing technique were tested again following the same four-point-bending load scheme. Based on the overall performance of the beams, it is deduced that the shear strength and deformation capability of the jacketed beams were substantially increased compared to the corresponding capacities of the initial beams. Further, although all beams failed in a shear abrupt manner, the retrofitted ones exhibited reduced brittleness and higher deflections at failure up to six times with respect to the initially tested specimens. The level of the initial damage influences the efficiency of the jacketing. Additional test data derived from relative shear-damaged beam specimens and retrofitted with similar thin jackets is also presented herein in order to establish the effectiveness of this repair system and to clarify the parameters affecting its structural reliability. Comparisons indicated that jacketed beams can alter the failure mode from brittle shear to ductile flexural under certain circumstances.

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Section: Research Significancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

et al. 2019

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“…Of course, it has to be mentioned that the effectiveness of the adopted simulation methodology stems from the more or less two-dimensional deformation patterns that develop in the tested specimens. Similar methodologies have already been applied by the first two authors for the simulation of fibre reinforced cementitious matrix beams (Georgiadi-Stefanidi et al 2010 and by the second author for the simulation of the response of various types of steel connections (Mistakidis et al 1997, Kontoleon et al 1999.…”

Section: Introductionmentioning

confidence: 99%

Simulation of experiments on RC frames strengthened with dissipative steel links

Georgiadi-Stefanidi¹,

Mistakidis

Stylianidis³

2013

Advances in concrete construction

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The use of steel bracing systems is a popular method for the strengthening of existing reinforced concrete (RC) frames and may lead to a substantial increase of both strength and stiffness. However, in most retrofitting cases, the main target is the increase of the energy dissipation capacity. This paper studies numerically the efficiency of a specific strengthening methodology which utilizes a steel link element having a cross-section of various shapes, connected to the RC frame through bracing elements. The energy is dissipated through the yielding of the steel link element. The case studied is a typical one bay, single-storey RC frame, constructed according to older code provisions, which is strengthened through two different types of link elements. The presented numerical models are based on tests which are simulated in order to gain a better insight of the behaviour of the strengthened structures, but also in order to study the effects of different configurations for the link element. The behaviour of the strengthened frames is studied with respect to the one of the original bare frame. Moreover, the numerically obtained results are compared to the experimentally obtained ones, in order to verify the effectiveness of the applied simulation methodology.

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“…The main advantages of this solution with respect to other retrofitting techniques are the better compatibility with irregular surfaces (such as concrete substrates), the easier workability, the higher durability and the smaller cost of installation [9]. Finite element analyses on FRCM-strengthened elements represent an important tool to predict the enhancement of their structural capacity [10], [11]. The aim of this study is not only to verify the effectiveness of FRCM composites in strengthening and retrofitting reinforced concrete elements, but also to assess the potential of available numerical approaches in simulating the behavior of these materials when applied as externally bonded reinforcements.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of FRCM composites for the seismic retrofitting of existing concrete structures

Rampini¹,

Zani²,

Colombo³

et al. 2021

"SP-345: Materials, Analysis, Structural Design and Applications of Textile Reinforced Concrete/Fabric Reinforced Cementitious

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Fabric-reinforced cementitious matrix (FRCM) composites are promising structural materials representing the extension of textile reinforced concrete (TRC) technology to repairing applications. Recent experiences have proven the ability of FRCMs to increase the mechanical performances of existing elements, ensuring economic and environmental sustainability. Since FRCM composites are generally employed in the form of thin externally bonded layers, one of the main advantages is the ability to improve the overall energy absorption capacity, weakly impacting the structural dead weights and the structural stiffness and, as a direct consequence, the inertial force distributions activated by seismic events. In the framework of new regulatory initiatives, the paper aims at proposing simplified numerical approaches for the structural design of retrofitting interventions on existing reinforced concrete structures. To this purpose, the research is addressed at two main levels: i) the material level is investigated on the uniaxial tensile response of FRCM composites, modeled by means of well-established numerical approaches; and ii) the macro-scale level is evaluated and modeled on a double edge wedge splitting (DEWS) specimen, consisting of an under-reinforced concrete substrate retrofitted with two outer FRCM composites. This novel experimental technique, originally introduced to investigate the fracture behavior of fiberreinforced concrete, allows transferring substrate tensile stresses to the retrofitting layers by means of the sole chemo-mechanical adhesion, allowing to investigate the FRCM delamination and cracking phenomena occurring in the notched ligament zone. It is believed that the analysis of the experimental results, assisted by simplified and advanced non-linear numerical approaches, may represent an effective starting point for the derivation of robust design-oriented models.

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Numerical simulation of tested reinforced concrete beams strengthened by thin fibre-reinforced cementitious matrix jackets

Cited by 4 publications

References 25 publications

Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

Simulation of experiments on RC frames strengthened with dissipative steel links

Numerical modeling of FRCM composites for the seismic retrofitting of existing concrete structures

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