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Fiber-reinforced cementitious matrix (FRCM) composites are usually mechanically characterized by means of tensile and bond tests. The former, in the clevis-grip version, is referred to by the American guidelines ACI 549.4R (2013) to determine the tensile properties of the FRCM composite. The latter, in the single-lap version, is used in the Italian guidelines CNR-DT 215 (2018) to determine the effective strain. The effective strain is the strain at which debonding occurs and therefore composite action is lost. In this paper, the poliparafenilene benzobisoxazole (PBO) fiber–matrix stress transfer law, also known as cohesive material law (CML), is employed in an analytical model that describes clevis-grip tensile tests of PBO-FRCM composites. The CML was previously obtained by the authors from single-lap shear tests. The load responses provided by the model are compared with the results of tensile tests herein presented in addition to selected tests from the literature. The experimental cracking process, tensile strength, and deformation capacity can be accurately predicted by the analytical model. The comparison indicates that the knowledge of the CML of the fiber–matrix interface allows for an accurate prediction of the main tensile properties of the PBO-FRCM coupon.
Francesco Focacci; Tommaso D'Antino; Christian Carloni. The role of the fiber–matrix interfacial properties on the tensile behavior of FRCM coupons. Construction and Building Materials 2020, 265, 120263 .
AMA StyleFrancesco Focacci, Tommaso D'Antino, Christian Carloni. The role of the fiber–matrix interfacial properties on the tensile behavior of FRCM coupons. Construction and Building Materials. 2020; 265 ():120263.
Chicago/Turabian StyleFrancesco Focacci; Tommaso D'Antino; Christian Carloni. 2020. "The role of the fiber–matrix interfacial properties on the tensile behavior of FRCM coupons." Construction and Building Materials 265, no. : 120263.
Debonding of fiber-reinforced composites can limit the increase of strength that a reinforced concrete (RC) beam can achieve due to the addition of the external layer of reinforcement provided by the composite. Small-scale direct shear tests can help understand the debonding phenomenon. However, researchers have debated for decades whether the results of direct shear tests can be used to predict the strain level at which the composite would fail in strengthened beams. This paper is the first systematic attempt to address this issue. A database of RC beam flexural tests and of direct shear tests that feature externally bonded polypara-phenylene-benzo-bisoxazole (PBO) fiber-reinforced cementitious matrix (FRCM) composite is compiled. For the beam tests, two methods are employed to determine the strain in the composite at failure due to debonding, referred to herein as the cross-sectional analysis method and the ΔM method, and the results are compared with those of direct shear tests. The relationship between the effective strain in the FRCM when composite action is lost and the debonding strain in direct shear tests is critically discussed taking into account what is prescribed by current design guidelines. The limitations of the cross-sectional analysis method to determine the effective strain are also highlighted.
Tommaso D'Antino; Francesco Focacci; Lesley H. Sneed; Christian Carloni. Relationship between the effective strain of PBO FRCM-strengthened RC beams and the debonding strain of direct shear tests. Engineering Structures 2020, 216, 110631 .
AMA StyleTommaso D'Antino, Francesco Focacci, Lesley H. Sneed, Christian Carloni. Relationship between the effective strain of PBO FRCM-strengthened RC beams and the debonding strain of direct shear tests. Engineering Structures. 2020; 216 ():110631.
Chicago/Turabian StyleTommaso D'Antino; Francesco Focacci; Lesley H. Sneed; Christian Carloni. 2020. "Relationship between the effective strain of PBO FRCM-strengthened RC beams and the debonding strain of direct shear tests." Engineering Structures 216, no. : 110631.
Fiber-reinforced cementitious matrix (FRCM) composites are usually mechanically characterized by means of tensile and bond tests. The load responses provided by tensile tests are typically comprised of three phases, namely the uncracked, cracking, and fully cracked phase. The uncracked phase ends when the applied stress attains the matrix tensile strength. During the cracking phase, multiple cracks form in the matrix and the behavior of the specimens is governed by the shear stress acting at the fiber-matrix interface. During the fully cracked phase the width of the cracks increases and the applied load is carried by the textile in the cracked cross-sections. The bond behavior of FRCM composites is generally investigated using single-lap direct-shear test set-ups, which allow for the evaluation of the stress-transfer mechanism within the matrix, at the matrix-substrate interface, and at the matrix-fiber interface. Results of single-lap shear tests have been employed to calibrate a cohesive material law (CML) that describes the bond behavior between the poliparafenilenbenzobisoxazole (PBO) fibers and the embedding matrix of a PBO-FRCM composite. In this paper, the PBO fiber-matrix CML obtained from direct-shear tests is employed in an analytical model that describes clevis-grip tensile tests of a PBO-FRCM composite in order to verify if the cracking process can be accurately predicted by the analytical model.
Francesco Focacci; Tommaso D’Antino; Christian Carloni. Analytical Modelling of the Tensile Response of PBO-FRCM Composites. Recent Advances in Computational Mechanics and Simulations 2020, 527 -536.
AMA StyleFrancesco Focacci, Tommaso D’Antino, Christian Carloni. Analytical Modelling of the Tensile Response of PBO-FRCM Composites. Recent Advances in Computational Mechanics and Simulations. 2020; ():527-536.
Chicago/Turabian StyleFrancesco Focacci; Tommaso D’Antino; Christian Carloni. 2020. "Analytical Modelling of the Tensile Response of PBO-FRCM Composites." Recent Advances in Computational Mechanics and Simulations , no. : 527-536.
Fiber reinforced cementitious matrix (FRCM) composites, also known as textile reinforced matrix (TRM) composites, are a suitable alternative to fiber reinforced polymer (FRP) composites to strengthen reinforced concrete and masonry structures. In the toolbox of FRCMs, a recently-developed composite that employs high-strength steel fibers embedded in a hydraulic mortar is particular appealing for applications on historical masonry constructions. This type of composite is known as steel reinforced grout (SRG). In this paper, an extensive experimental work is presented. Single-lap shear tests are performed to study the debonding of SRG strips from a masonry substrate, which is the critical failure mode for strengthening applications. For SRGs, debonding typically occurs at the fiber-matrix interface. A large scatter of the experimental results is observed, which is related to the variability of hydraulic mortars and their ability to impregnate the fibers. Although strain gauges can be applied directly to the fibers to obtain the experimental strain profile along the fibers, because of the presence of the matrix these measurements are complex and in some cases not reliable. Thus, indirect method based on the global response of the test is proposed to obtain the interfacial properties.
Mattia Santandrea; Francesco Focacci; Claudio Mazzotti; Francesco Ubertini; Christian Carloni. Determination of the interfacial cohesive material law for SRG composites bonded to a masonry substrate. Engineering Failure Analysis 2020, 111, 104322 .
AMA StyleMattia Santandrea, Francesco Focacci, Claudio Mazzotti, Francesco Ubertini, Christian Carloni. Determination of the interfacial cohesive material law for SRG composites bonded to a masonry substrate. Engineering Failure Analysis. 2020; 111 ():104322.
Chicago/Turabian StyleMattia Santandrea; Francesco Focacci; Claudio Mazzotti; Francesco Ubertini; Christian Carloni. 2020. "Determination of the interfacial cohesive material law for SRG composites bonded to a masonry substrate." Engineering Failure Analysis 111, no. : 104322.
The shear strength of reinforced concrete (RC) elements can be improved by applying externally bonded (EB) fiber-reinforced cementitious matrix (FRCM) composites. FRCM composites are generally U-wrapped around the cross-section of RC beams and completely wrapped around the cross-section of RC columns. When the U-wrapped layout is employed, composite debonding usually occurs before the tensile strength of the composite can be attained. However, depending on the specific FRCM adopted, different failure modes can be observed. Although the use of FRCM composites to strengthen existing RC members is gaining popularity, limited work has been done to formulate a reliable design procedure for FRCM shear strengthening of RC members. In this paper, a model is proposed to compute the shear strength contribution of FRCM composite U-wrapped around RC members. The model, which is an extension of the model used for fiber-reinforced polymer (FRP) shear strengthened beams, is based on mechanical considerations, does not contain empirical coefficients, and can be applied to any FRCM composite provided that the bond behavior and tensile strength are identified. The model is validated by comparing the analytical predictions with the experimental results of RC beams strengthened in shear with polyparaphenylene benzobisoxazole (PBO) and carbon FRCM composites found in the literature. Finally, an example of the evaluation of the shear capacity associated with the FRCM reinforcement is provided to illustrate the use of the model.
Tommaso D’Antino; Francesco Focacci; Lesley H. Sneed; Carlo Pellegrino. Shear Strength Model for RC Beams with U-Wrapped FRCM Composites. Journal of Composites for Construction 2020, 24, 04019057 .
AMA StyleTommaso D’Antino, Francesco Focacci, Lesley H. Sneed, Carlo Pellegrino. Shear Strength Model for RC Beams with U-Wrapped FRCM Composites. Journal of Composites for Construction. 2020; 24 (1):04019057.
Chicago/Turabian StyleTommaso D’Antino; Francesco Focacci; Lesley H. Sneed; Carlo Pellegrino. 2020. "Shear Strength Model for RC Beams with U-Wrapped FRCM Composites." Journal of Composites for Construction 24, no. 1: 04019057.
Francesco Focacci; Christian Carloni; Mario De Stefano. Approximate Evaluation of Maximum Force Transferable at FRP-Masonry Interface. Journal of Composites for Construction 2019, 23, 04019050 .
AMA StyleFrancesco Focacci, Christian Carloni, Mario De Stefano. Approximate Evaluation of Maximum Force Transferable at FRP-Masonry Interface. Journal of Composites for Construction. 2019; 23 (6):04019050.
Chicago/Turabian StyleFrancesco Focacci; Christian Carloni; Mario De Stefano. 2019. "Approximate Evaluation of Maximum Force Transferable at FRP-Masonry Interface." Journal of Composites for Construction 23, no. 6: 04019050.
Composite materials have been widely used to strengthen masonry structures or to repair those damaged by earthquakes. While the effect of composite materials applied on undamaged masonry walls is widely investigated, their effectiveness when used to repair damaged ones still needs further investigations. This paper deals with the shear capacity of masonry panels repaired with carbon fiber reinforced polymer composites. In particular, masonry undamaged panels were tested under diagonal load up to failure, repaired with composite materials, and tested again. The repair technique proved its effectiveness, since the shear strength of the repaired specimens was similar to that of the original ones. The shear capacity of the repaired panels was computed with the approach provided by the CNR DT200 Italian guidelines. Within this framework, the cohesion of the masonry material was neglected for the evaluation of the shear capacity of the repaired panels to take into account for the pre-existing damage. This approach provides a satisfactory agreement with the experimental results.
Valerio Alecci; Sara Barducci; Angelo D'Ambrisi; Mario De Stefano; Francesco Focacci; Raimondo Luciano; Rosa Penna. Shear capacity of masonry panels repaired with composite materials: Experimental and analytical investigations. Composites Part B: Engineering 2019, 171, 61 -69.
AMA StyleValerio Alecci, Sara Barducci, Angelo D'Ambrisi, Mario De Stefano, Francesco Focacci, Raimondo Luciano, Rosa Penna. Shear capacity of masonry panels repaired with composite materials: Experimental and analytical investigations. Composites Part B: Engineering. 2019; 171 ():61-69.
Chicago/Turabian StyleValerio Alecci; Sara Barducci; Angelo D'Ambrisi; Mario De Stefano; Francesco Focacci; Raimondo Luciano; Rosa Penna. 2019. "Shear capacity of masonry panels repaired with composite materials: Experimental and analytical investigations." Composites Part B: Engineering 171, no. : 61-69.
Francesco Bencardino; Christian Carloni; Antonio Condello; Francesco Focacci; Annalisa Napoli; Roberto Realfonzo. Flexural behaviour of RC members strengthened with FRCM: State-of-the-art and predictive formulas. Composites Part B: Engineering 2018, 148, 132 -148.
AMA StyleFrancesco Bencardino, Christian Carloni, Antonio Condello, Francesco Focacci, Annalisa Napoli, Roberto Realfonzo. Flexural behaviour of RC members strengthened with FRCM: State-of-the-art and predictive formulas. Composites Part B: Engineering. 2018; 148 ():132-148.
Chicago/Turabian StyleFrancesco Bencardino; Christian Carloni; Antonio Condello; Francesco Focacci; Annalisa Napoli; Roberto Realfonzo. 2018. "Flexural behaviour of RC members strengthened with FRCM: State-of-the-art and predictive formulas." Composites Part B: Engineering 148, no. : 132-148.
Fabric Reinforced Cementitious Matrix (FRCM) materials are composed of a dry fiber grid embedded in an inorganic matrix, which may contain short fibers. These materials are particularly well-suited for the reinforcement of masonry structures due to their high compatibility with the substrate, vapor permeability and durability against environmental agents. The most important information needed for the characterization of these composite systems, for use as strengthening materials of masonry structures, are the tensile behaviour and the shear bond properties. A Round-Robin Test was organized by the RILEM Technical Committee 250-CSM and the Italian association Assocompositi in order to experimentally characterize different FRCM systems composed of PBO, carbon, glass, basalt, aramid and steel textiles embedded in cementitious or lime-based mortars. The systems were tested at different universities and research centers in Europe in order to investigate the influence of samples preparation, test set-up and instrumentation. In this paper, the experimental tests performed on Carbon-FRCM systems are described and discussed. Important aspects are analyzed herein: differences in the testing procedure and instrumentation, influence of textile geometry and mechanical properties of the constituent materials, importance of specimen preparation and curing conditions. Moreover, a comparison between tensile and shear tests is reported in order to determine a reliable procedure towards the complete characterization of an FRCM material
Francesca Giulia Carozzi; Alessandro Bellini; Tommaso D'antino; Gianmarco De Felice; Francesco Focacci; Łukasz Hojdys; Luca Laghi; Emma Lanoye; Francesco Micelli; Matteo Panizza; Carlo Poggi. Experimental investigation of tensile and bond properties of Carbon-FRCM composites for strengthening masonry elements. Composites Part B: Engineering 2017, 128, 100 -119.
AMA StyleFrancesca Giulia Carozzi, Alessandro Bellini, Tommaso D'antino, Gianmarco De Felice, Francesco Focacci, Łukasz Hojdys, Luca Laghi, Emma Lanoye, Francesco Micelli, Matteo Panizza, Carlo Poggi. Experimental investigation of tensile and bond properties of Carbon-FRCM composites for strengthening masonry elements. Composites Part B: Engineering. 2017; 128 ():100-119.
Chicago/Turabian StyleFrancesca Giulia Carozzi; Alessandro Bellini; Tommaso D'antino; Gianmarco De Felice; Francesco Focacci; Łukasz Hojdys; Luca Laghi; Emma Lanoye; Francesco Micelli; Matteo Panizza; Carlo Poggi. 2017. "Experimental investigation of tensile and bond properties of Carbon-FRCM composites for strengthening masonry elements." Composites Part B: Engineering 128, no. : 100-119.
The use of Fabric Reinforced Cementitious Matrix (FRCM) composites appears as a compatible and\ud effective technique to strengthen masonry structures. The use of FRCM composites in place of FRP (fiber\ud reinforced polymer) composites provides noticeable advantages in terms of fire and heat resistance and\ud vapor permeability. These characteristics are of primary importance in the field of the strengthening\ud historical buildings and monuments. This justifies the attention of the scientific community to the\ud mechanical behavior of the FRCM materials with the aim to define exhaustive strengthening design\ud guidelines.\ud The experimental research presented in this paper involves direct tensile tests and single lap shear\ud tests. It was carried out in the framework of the Technical Committee Rilem TC 250 CSM (Composites for\ud the Sustainable Strengthening of Masonry). Specifically, this paper concerns FRCM systems comprising\ud PBO (polyparaphenylene benzobisoxazole) or Aramid textiles
Carmelo Caggegi; Francesca Giulia Carozzi; Stefano De Santis; Francesco Fabbrocino; Francesco Focacci; Łukasz Hojdys; Emma Lanoye; Luigia Zuccarino. Experimental analysis on tensile and bond properties of PBO and aramid fabric reinforced cementitious matrix for strengthening masonry structures. Composites Part B: Engineering 2017, 127, 175 -195.
AMA StyleCarmelo Caggegi, Francesca Giulia Carozzi, Stefano De Santis, Francesco Fabbrocino, Francesco Focacci, Łukasz Hojdys, Emma Lanoye, Luigia Zuccarino. Experimental analysis on tensile and bond properties of PBO and aramid fabric reinforced cementitious matrix for strengthening masonry structures. Composites Part B: Engineering. 2017; 127 ():175-195.
Chicago/Turabian StyleCarmelo Caggegi; Francesca Giulia Carozzi; Stefano De Santis; Francesco Fabbrocino; Francesco Focacci; Łukasz Hojdys; Emma Lanoye; Luigia Zuccarino. 2017. "Experimental analysis on tensile and bond properties of PBO and aramid fabric reinforced cementitious matrix for strengthening masonry structures." Composites Part B: Engineering 127, no. : 175-195.
Valerio Alecci; Francesco Focacci; Luisa Rovero; Gianfranco Stipo; Mario De Stefano. Intrados strengthening of brick masonry arches with different FRCM composites: Experimental and analytical investigations. Composite Structures 2017, 176, 898 -909.
AMA StyleValerio Alecci, Francesco Focacci, Luisa Rovero, Gianfranco Stipo, Mario De Stefano. Intrados strengthening of brick masonry arches with different FRCM composites: Experimental and analytical investigations. Composite Structures. 2017; 176 ():898-909.
Chicago/Turabian StyleValerio Alecci; Francesco Focacci; Luisa Rovero; Gianfranco Stipo; Mario De Stefano. 2017. "Intrados strengthening of brick masonry arches with different FRCM composites: Experimental and analytical investigations." Composite Structures 176, no. : 898-909.
Francesco Focacci; T. D'Antino; Christian Carloni; L.H. Sneed; C. Pellegrino. An indirect method to calibrate the interfacial cohesive material law for FRCM-concrete joints. Materials & Design 2017, 128, 206 -217.
AMA StyleFrancesco Focacci, T. D'Antino, Christian Carloni, L.H. Sneed, C. Pellegrino. An indirect method to calibrate the interfacial cohesive material law for FRCM-concrete joints. Materials & Design. 2017; 128 ():206-217.
Chicago/Turabian StyleFrancesco Focacci; T. D'Antino; Christian Carloni; L.H. Sneed; C. Pellegrino. 2017. "An indirect method to calibrate the interfacial cohesive material law for FRCM-concrete joints." Materials & Design 128, no. : 206-217.
Over the past two decades, composite materials, in forms of Fiber Reinforced Polymers (FRP), have been widely spread worldwide in the field of civil and monumental construction. Design guidelines and provisions were developed and provided by national and international institutions. In the last years, a new generation of materials, named Fabric Reinforced Cementitious Matrix (FRCM) were introduced as strengthening devices for concrete and masonry structures. Their application in the field of historical masonry has grown as a result of the recent Italian earthquakes. In this paper, starting from a retrospective on what has been done in recent years in the field of FRP applications, insights will be discussed for future research and applications of FRP and FRCM in heritage buildings. Some differences between FRP and FRCM materials will be highlighted, in terms of fiber-matrix interface and delamination mechanisms. The different micromechanical behavior in terms of fracture energy will be highlighted, and the macro-mechanical implications in terms of ductility will be pointed out, as a first attempt to quantify this complex problem. By considering the last innovative and pioneering applications of FRP/FRCM in heritage buildings, criteria for structural enhancement will be shown and discussed. This is done with a special focus on the ability, shown by these new technologies, to inhibit failure mechanisms in masonry artifacts.
Angelo DI Tommaso; Francesco Focacci; Francesco Micelli. Strengthening Historical Masonry with FRP or FRCM: Trends in Design Approach. Key Engineering Materials 2017, 747, 166 -173.
AMA StyleAngelo DI Tommaso, Francesco Focacci, Francesco Micelli. Strengthening Historical Masonry with FRP or FRCM: Trends in Design Approach. Key Engineering Materials. 2017; 747 ():166-173.
Chicago/Turabian StyleAngelo DI Tommaso; Francesco Focacci; Francesco Micelli. 2017. "Strengthening Historical Masonry with FRP or FRCM: Trends in Design Approach." Key Engineering Materials 747, no. : 166-173.
This paper examines the structural behavior of masonry arches strengthened at the intrados with fabric reinforced cementitions matrix (FRCM) composites. Textiles made of poliparafenilenbenzobisoxazole (PBO) and carbon fibers are considered. The experimental results are compared with those obtained on un-strengthened arches and arches strengthened with a carbon fiber reinforced polymer (C-FRP) composite. The tested arches are analyzed with the approach of the limit analysis of the collapse mechanisms.
Valerio Alecci; Francesco Focacci; Luisa Rovero; Gianfranco Stipo; Giovanni Mantegazza; Mario De Stefano. FRCM Composites for Strengthening of Brick Masonry Arches. Key Engineering Materials 2017, 747, 174 -181.
AMA StyleValerio Alecci, Francesco Focacci, Luisa Rovero, Gianfranco Stipo, Giovanni Mantegazza, Mario De Stefano. FRCM Composites for Strengthening of Brick Masonry Arches. Key Engineering Materials. 2017; 747 ():174-181.
Chicago/Turabian StyleValerio Alecci; Francesco Focacci; Luisa Rovero; Gianfranco Stipo; Giovanni Mantegazza; Mario De Stefano. 2017. "FRCM Composites for Strengthening of Brick Masonry Arches." Key Engineering Materials 747, no. : 174-181.
In recent decades, many strengthening interventions on masonry elements were performed by using fiber reinforced polymers (FRPs). These advanced materials proved to be effective to increase the load-carrying capacity of masonry elements and to improve their structural behavior, avoiding the most critical failure modes. Despite the advantages of this technique compared to more traditional methods, FRP systems have disadvantages related to their low resistance to high temperatures, impossibility of application on wet surfaces, low permeability, and poor compatibility with masonry supports. Therefore, composite materials made of a fiber textile embedded in an inorganic matrix were recently proposed as alternatives to FRPs for strengthening historic masonry constructions. These composite materials are easier to install, have higher resistance to high temperatures, and permit higher vapor permeability than FRPs. The inorganic matrix is frequently a cement-based mortar, and the composite materials made of a fiber textile embedded in a cement-based mortar are usually identified as FRCM (fabric reinforced cementitious matrix) composites. More recently, the use of natural lime mortar as an inorganic matrix has been proposed as an alternative to cement-based mortars when historic compatibility with the substrate is strictly required, as in case of restoration of historic buildings. In this paper, the effectiveness of a fabric made of basalt fibers embedded in lime mortar matrix (Basalt-FRLM) for the strengthening of masonry arches is investigated. An experimental investigation was performed on 1:2 scaled brick masonry arches strengthened at the extrados with a layer of Basalt-FRLM and tested under vertical load. The results obtained are compared with previous results obtained by the authors by testing masonry arches strengthened at their extrados with FRCM and FRP composites. This investigation highlights the effectiveness of Basalt-FRLM in increasing load-currying and the displacement capacities of masonry arches. The Basalt-FRLM-strengthened arch exhibited higher displacement capacity when compared to arches strengthened with polymeric and cementitious matrix composites.
Valerio Alecci; Mario De Stefano; Francesco Focacci; Raimondo Luciano; Luisa Rovero; Gianfranco Stipo. Strengthening Masonry Arches with Lime-Based Mortar Composite. Buildings 2017, 7, 49 .
AMA StyleValerio Alecci, Mario De Stefano, Francesco Focacci, Raimondo Luciano, Luisa Rovero, Gianfranco Stipo. Strengthening Masonry Arches with Lime-Based Mortar Composite. Buildings. 2017; 7 (4):49.
Chicago/Turabian StyleValerio Alecci; Mario De Stefano; Francesco Focacci; Raimondo Luciano; Luisa Rovero; Gianfranco Stipo. 2017. "Strengthening Masonry Arches with Lime-Based Mortar Composite." Buildings 7, no. 4: 49.
This paper deals with the experimental results of an investigation aimed at studying cyclic response of\ud half scaled RC specimens previously damaged and then repaired with externally bonded carbon fiber\ud reinforced polymer sheets. The research involved the test of ten specimens. Two of them were tested\ud without any external strengthening material in order to provide a reference for the response of repaired\ud specimens. These latter were tested after a previous damaging procedure and a subsequent repair\ud intervention with fiber reinforced polymer composites. The parameters under investigation were the\ud level of initial damage, the strengthening configuration, and the level of axial load. Test results have\ud pointed out effectiveness of the adopted strengthening systems, since repaired specimens exhibited\ud better mechanical responses than the unstrengthened ones
Francesco Capani; Angelo D'ambrisi; Mario De Stefano; Francesco Focacci; Raimondo Luciano; Raffaele Nudo; Rosa Penna. Experimental investigation on cyclic response of RC elements repaired by CFRP external reinforcing systems. Composites Part B: Engineering 2017, 112, 290 -299.
AMA StyleFrancesco Capani, Angelo D'ambrisi, Mario De Stefano, Francesco Focacci, Raimondo Luciano, Raffaele Nudo, Rosa Penna. Experimental investigation on cyclic response of RC elements repaired by CFRP external reinforcing systems. Composites Part B: Engineering. 2017; 112 ():290-299.
Chicago/Turabian StyleFrancesco Capani; Angelo D'ambrisi; Mario De Stefano; Francesco Focacci; Raimondo Luciano; Raffaele Nudo; Rosa Penna. 2017. "Experimental investigation on cyclic response of RC elements repaired by CFRP external reinforcing systems." Composites Part B: Engineering 112, no. : 290-299.
Debonding of the fiber-reinforced polymer (FRP) from the substrate that occurs before its tensile strength is reached typically controls the effectiveness of the stress transfer mechanism between FRP composites and a quasi-brittle substrate, such as masonry. The FRP-substrate interface is usually modelled as a zero-thickness interface whose fracture Mode-II cohesive material law (CML) is defined in terms of shear stress and slip at the interface. In this paper, the effect of the shape of the CMLs of the FRP-brick and FRP-mortar interfaces on the stress transfer process will be presented and discussed. Several multi-linear CMLs, obtained from experimental data for both mortar and brick interfaces, will be adopted to obtain the load response of the FRP-masonry interface. It will be shown that the shape of the CMLs adopted does not strongly affect the load response if the fracture parameters are the same or similar among the CMLs. Finally, certain geometric relationships of brick and mortar joints imply more pronounced differences in terms of load response between the CMLs adopted
M. Malena; F. Focacci; C. Carloni; G. de Felice. The effect of the shape of the cohesive material law on the stress transfer at the FRP-masonry interface. Composites Part B: Engineering 2017, 110, 368 -380.
AMA StyleM. Malena, F. Focacci, C. Carloni, G. de Felice. The effect of the shape of the cohesive material law on the stress transfer at the FRP-masonry interface. Composites Part B: Engineering. 2017; 110 ():368-380.
Chicago/Turabian StyleM. Malena; F. Focacci; C. Carloni; G. de Felice. 2017. "The effect of the shape of the cohesive material law on the stress transfer at the FRP-masonry interface." Composites Part B: Engineering 110, no. : 368-380.
Fabric-Reinforced Cementitious Matrix (FRCM) materials are becoming increasingly suitable for strengthening of historic masonry constructions but only few experimental studies are still available concerning their application on structural elements. In the paper, the structural behavior of masonry arches strengthened at the extrados with a poliparafenilenbenzobisoxazole (PBO) fabric reinforced cementitious mortar composite is investigated through an experimental and analytical approach. The experimental tests were performed both on unstrengthened and strengthened masonry arches in order to evaluate the contribution of the strengthening material in terms of maximum load and post-peak behavior. The failure mechanisms were also analyzed and discussed. Beam tests were carried out in order to evaluate the bond capacity of the FRCM-masonry interface. The tested arches were analyzed using the approach of the limit analysis of the collapse mechanisms, which was able to accurately estimate the experimental collapse loads.
Valerio Alecci; Francesco Focacci; Luisa Rovero; Gianfranco Stipo; Mario De Stefano. Extrados strengthening of brick masonry arches with PBO–FRCM composites: Experimental and analytical investigations. Composite Structures 2016, 149, 184 -196.
AMA StyleValerio Alecci, Francesco Focacci, Luisa Rovero, Gianfranco Stipo, Mario De Stefano. Extrados strengthening of brick masonry arches with PBO–FRCM composites: Experimental and analytical investigations. Composite Structures. 2016; 149 ():184-196.
Chicago/Turabian StyleValerio Alecci; Francesco Focacci; Luisa Rovero; Gianfranco Stipo; Mario De Stefano. 2016. "Extrados strengthening of brick masonry arches with PBO–FRCM composites: Experimental and analytical investigations." Composite Structures 149, no. : 184-196.
FRP reinforcement is well known as a possible alternative to steel bars in order to improve durability of\ud reinforced concrete members. However, the intrinsic brittleness of concrete and FRP materials may\ud induce problems at the ultimate conditions due to premature failure modes; the performance under\ud service loads is a critical issue as well. To investigate response of concrete members reinforced with\ud longitudinal glass or carbon FRP bars without shear reinforcement, an experimental program has been\ud developed. The sixteen specimens designed and cast within this project were characterized by different\ud study variables concerning cross section geometry, concrete grade and type of reinforcement. The results\ud of tests performed on FRP-reinforced specimens are presented in this paper. In particular, different failure\ud modes due to flexure and shear have been observed; response under load levels simulating service\ud conditions has been also examined. Results of FRP-reinforced specimens have been compared with those\ud given by control specimens provided with conventional steel bars. Finally, analytical procedures to\ud evaluate immediate deflections of FRP-reinforced members have been assessed
Andrea Acciai; Angelo D'Ambrisi; Mario De Stefano; Luciano Feo; Francesco Focacci; Raffaele Nudo. Experimental response of FRP reinforced members without transverse reinforcement: Failure modes and design issues. Composites Part B: Engineering 2016, 89, 397 -407.
AMA StyleAndrea Acciai, Angelo D'Ambrisi, Mario De Stefano, Luciano Feo, Francesco Focacci, Raffaele Nudo. Experimental response of FRP reinforced members without transverse reinforcement: Failure modes and design issues. Composites Part B: Engineering. 2016; 89 ():397-407.
Chicago/Turabian StyleAndrea Acciai; Angelo D'Ambrisi; Mario De Stefano; Luciano Feo; Francesco Focacci; Raffaele Nudo. 2016. "Experimental response of FRP reinforced members without transverse reinforcement: Failure modes and design issues." Composites Part B: Engineering 89, no. : 397-407.
Christian Carloni; Francesco Focacci. FRP-masonry interfacial debonding: An energy balance approach to determine the influence of the mortar joints. European Journal of Mechanics - A/Solids 2016, 55, 122 -133.
AMA StyleChristian Carloni, Francesco Focacci. FRP-masonry interfacial debonding: An energy balance approach to determine the influence of the mortar joints. European Journal of Mechanics - A/Solids. 2016; 55 ():122-133.
Chicago/Turabian StyleChristian Carloni; Francesco Focacci. 2016. "FRP-masonry interfacial debonding: An energy balance approach to determine the influence of the mortar joints." European Journal of Mechanics - A/Solids 55, no. : 122-133.