Experimental Investigation on Bond Behavior of Cement-Matrix–Based Composites for Strengthening of Masonry Structures

Alecci, Valerio; Stefano, Mario De; Luciano, Raimondo; Rovero, Luisa; Stipo, Gianfranco

doi:10.1061/(asce)cc.1943-5614.0000598

Cited by 56 publications

(31 citation statements)

References 26 publications

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“…Each analysis evaluated the structural capacity relating to the border points of each domain. The main results are the variation of the index of seismic risk IR, given by Equation (12). IR values are reported in the histograms of Figure 14a,b.…”

Section: Strength Domainmentioning

confidence: 99%

“…The building characterization [9,10] has great relevance, in particular, to the seismic vulnerability assessment [11], in which non-structural elements also play a relevant role [12][13][14]. According to previous experiences on the monitoring and rehabilitation of existing buildings [4,[15][16][17] it is possible to notice significant uncertainties in the mechanical properties of both concrete and steel bars.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Material Variability and Mechanical Eccentricity on the Seismic Vulnerability Assessment of Reinforced Concrete Buildings

et al. 2017

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Abstract:The present paper deals with the influence of material variability on the seismic vulnerability assessment of reinforced concrete buildings. Existing r.c. buildings are affected by a strong dispersion of material strengths of both the base materials. This influences the seismic response in linear and nonlinear static analysis. For this reason, it is useful to define a geometrical parameter called "material eccentricity". As a reference model, an analysis of a two storey building is presented with a symmetrical plan but asymmetrical material distribution. Furthermore, an analysis of two real buildings with a similar issue is performed. Experimental data generate random material distributions to carry out a probabilistic analysis. By rotating the vector that defines the position of the center of strength it is possible to describe a strength domain that is characterized by equipotential lines in terms of the Risk Index. Material eccentricity is related to the Ultimate Shear of non-linear static analyses. This relevant uncertainty, referred to as the variation of the center of strength, is not considered in the current European and Italian Standards. The "material eccentricity" therefore reveals itself to be a relevant parameter to considering how material variability affects such a variation.

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Section: Strength Domainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Material Variability and Mechanical Eccentricity on the Seismic Vulnerability Assessment of Reinforced Concrete Buildings

et al. 2017

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“…There are traditional (e.g., steel ties or buttresses [1]) and innovative (e.g., composites [2,3]) techniques to ensure a safe seismic behavior at the local level, by considering the typical biaxial stress state that could involve energy dissipation [4][5][6]. Nevertheless, when a global box-type behavior is not guaranteed, the walls, especially the peripheral ones, are more vulnerable to out-of-plane overturning, which is one of the main causes of damage or collapse induced by earthquakes on existing masonry structures.…”

Section: Introductionmentioning

confidence: 99%

Rocking and Kinematic Approaches for Rigid Block Analysis of Masonry Walls: State of the Art and Recent Developments

2017

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Abstract:The assessment of the rocking and overturning response of rigid blocks to earthquakes is a complex task, due to its high sensitivity to the input motion, variations in geometry and dissipation issues. This paper presents a literature review dealing with classical and advanced approaches on rocking motion with particular reference to masonry walls characterized by a monolithic behavior. Firstly, the pioneering work of Housner based on the concept of the inverted pendulum is discussed in terms of the most significant parameters, i.e., the size and slenderness of the blocks, the coefficient of restitution and ground motion properties. Free and restrained rocking blocks are considered. Then, static force-based approaches and performance-based techniques, mostly based on limit analysis theory, are presented to highlight the importance of investigating the evolution of the rocking mechanisms by means of pushover curves characterized by negative stiffness. From a dynamic perspective, a review of probabilistic approaches is also presented, evaluating the cumulative probability of exceedance of any response level by considering different earthquake time histories. Some recent simplified approaches based on the critical rocking response and the worst-case scenario are illustrated, as well.

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“…Traditional strengthening techniques (i.e., steel profiles or reinforced concrete hoods), which revealed many drawbacks, have been replaced by advanced strengthening solutions, based on the use of polymeric-based composite materials (fiber reinforced polymer, FRP). Innovative composite materials constituted by a fabric embedded in a cement-based matrix (FRCM, fabric reinforced cementitious mortar) are being studied [12][13][14][15][16][17][18] as an alternative to FRPs [19][20][21][22][23], mainly to strengthen historic buildings due to their high compatibility with masonry substrate in terms of resistance to high temperature and vapor permeability. Recently, a natural lime mortar matrix has been proposed as alternative to the cement-based matrix [24] when historic compatibility with the substrate is required, as in case of restorations of monumental buildings.…”

Section: Introductionmentioning

confidence: 99%

Strengthening Masonry Arches with Lime-Based Mortar Composite

et al. 2017

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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.

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Experimental Investigation on Bond Behavior of Cement-Matrix–Based Composites for Strengthening of Masonry Structures

Cited by 56 publications

References 26 publications

Effect of Material Variability and Mechanical Eccentricity on the Seismic Vulnerability Assessment of Reinforced Concrete Buildings

Effect of Material Variability and Mechanical Eccentricity on the Seismic Vulnerability Assessment of Reinforced Concrete Buildings

Rocking and Kinematic Approaches for Rigid Block Analysis of Masonry Walls: State of the Art and Recent Developments

Strengthening Masonry Arches with Lime-Based Mortar Composite

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