Numerical Assessment of the Out-of-Plane Response of Masonry Panels Reinforced by Means of FRCM Systems

Pantò, Bartolomeo; Malena, Marialaura; Felice, Gianmarco de

doi:10.7712/120117.5610.18184

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…If the fiber contribution reduces before failure, the stress–strain relationship is similar to the behavior of the dry fibers close to failure, with a final third showing almost linear behavior [38]. In this phase the internal fibers could slip with respect to the matrix [39], providing some ductility due to the fact that the failure of the fibers does not take place at the same time, but progressively over time [40]. The third phase ends with the achievement of the tensile failure of the fibers with a slope equal to E 3 , the value of the modulus of elasticity of the dry fibers [41].…”

Section: Stress–strain Behavior Of Materialsmentioning

confidence: 99%

Unified Theory for Flexural Strengthening of Masonry with Composites

et al. 2019

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Recent calamitous events have shown the fragility of the existing masonry buildings. Many of them are heritage structures, such as churches and monumental buildings. Therefore, optimized strengthening strategies are necessary. Experimental studies performed on masonry elements strengthened with composite systems have shown the performance of these materials. However, further development is necessary to optimize the intervention strategies. In fact, due to the lack of general validity models, the design is usually based on prescriptive approaches according to manufacturers’ broad instructions, often producing systems with low efficiency and overestimations of the amount of reinforcement. In this paper a generalized approach is proposed to assess the flexural behavior of masonry sections strengthened with composites. The proposed theory has allowed performance of a sensitivity analysis assessing the impact both of the mechanical parameters of masonry and of the strengthening system. In particular, the impact of several constitutive relationships of composites (linear, bilinear, or trilinear) have been evaluated in terms of ultimate behavior of the strengthened masonry. For strengthening systems more compatible with the masonry substrate, the form of the stress–strain relationship becomes a key aspect. For such cases, the modeling of the reinforcement plays a fundamental role and the form of the relationship is strongly correlated to the type of reinforcement selected, e.g., organic versus inorganic matrix.

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Section: Stress–strain Behavior Of Materialsmentioning

confidence: 99%

Unified Theory for Flexural Strengthening of Masonry with Composites

et al. 2019

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“…Over the past two decades, TRM (Textile Reinforced Mortar) systems have been increasingly used for the repair and strengthening of concrete [ 1 , 2 , 3 , 4 ] and masonry structures [ 5 , 6 , 7 ] as they can improve significantly structural performance without substantially altering geometry, masses and stiffness. The superior performance of this innovative solution based on textiles embedded within inorganic matrices has been demonstrated in several research documents available in the literature [ 8 , 9 ]. In addition, the use of TRM can ensure that preservation criteria are successfully met when strengthening architectural heritage [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Bond Behavior of Steel Cords Embedded in Inorganic Mortars

Roscini

Guadagnini

2022

Materials

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This paper investigates the bond behavior of steel cords embedded in inorganic matrices. A series of pull-out tests were carried out on individual galvanized steel cords embedded in either a cementitious or lime-based mortar matrix and the corresponding bond-slip relationships were derived. The quality of bond between cord and mortar was found to be critically affected by the workability of the mortar and its ability to create adequate composite action along the entire embedment length of the cord. The more workable lime-based mortar was found to guarantee a better interaction with the steel cord, in terms of initial bond stiffness, maximum bond strength, and post-peak behavior. The experimentally derived bond–slip relationships were subsequently integrated in a 3D non-linear finite element framework and used to determine the constitutive relationship of a surface-based cohesive contact between cord and mortar. The cohesive bond behavior was used to conduct a series of parametric studies on cords embedded in a lime-based mortar and examine the stress development within specimens with cords of different embedment lengths and subjected to different loading conditions (i.e., pull-out and direct tension). The active ‘Stress Transfer Zone’ was found to be about 125 mm, while an ‘Effective Transfer Radius’ of approximately 3.5–4 mm was identified. The numerical investigation implemented in this paper enabled one to study key interaction properties of steel reinforced grouts and can assist the design of more effective strengthening solutions.

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“…Such a type of composites emerged as a sustainable repair methodology, suitable for infrastructure rehabilitation, including historical masonry building, thanks to their ease of application without increasing the mass of the structure, the vapour permeability and thermal compatibility with the substrate, durability against external agents and the high reversibility of the intervention [1]. Due to the above described reasons, SRG composites have become a valid alternative to Fiber Reinforced Polymer (FRP) composites for strengthening masonry structures [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, numerical simulation of current available test procedures is mandatory to identify peculiar aspects of the response that, in a following stage, become an integral part of large scale models, when entire reinforced structures or portions need to be analysed [7][8]. This work presents a numerical simulation, carried out by non-linear finite element models, of the current available direct tensile tests on SRG coupons, namely the Clamping and the Clevis tests.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of the Experimental Response of SRG Systems

Malena

Sangirardi

Roscini

et al. 2019

KEM

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Modern repairing and retrofitting methods for existing structures make use of composite materials, consisting of high strength textiles and a matrix, which can be either polymeric or inorganic. These kinds of techniques have been largely applied to masonry structures, since they significantly improve structural performance with a small increase of weight and a minimum invasiveness. However, the application of organic gluing agents on masonry has revealed some well-known drawbacks, which are almost all overcome resorting to inorganic matrixes, namely cement or lime mortars. An entire class of composites is thus identified as TRM (Textile Reinforced Mortars) or FRCM (Fibre Reinforced Cementitious Matrices). Among them, Steel Reinforced Grout (SRG) are characterized by Ultra High Tensile Strength Steel (UHTSS) cords embedded in mortar matrix and their use to improve the structural performance of existing historical masonry buildings is becoming more and more diffused. Qualification tests and acceptance criteria for SRG have just been defined. Nonetheless, numerical simulation of current available test procedures is mandatory to identify peculiar aspects of the response that at a following stage become an integral part of large scale models, when entire reinforced structures or portions need to be analysed. To this end, this work presents the numerical modelling of two different direct tensile tests on SRG systems: the Clamping-grip setup (RILEM Technical Committee 232-TDT 2016) and the Clevis-grip setup (ICC-ES AC434 2016). Numerical models able to replicate experimental tests and catch fundamental differences in their failure mechanisms are present

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Numerical Assessment of the Out-of-Plane Response of Masonry Panels Reinforced by Means of FRCM Systems

Cited by 4 publications

References 11 publications

Unified Theory for Flexural Strengthening of Masonry with Composites

Unified Theory for Flexural Strengthening of Masonry with Composites

Bond Behavior of Steel Cords Embedded in Inorganic Mortars

Numerical Modelling of the Experimental Response of SRG Systems

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