Destructive and minor destructive tests on masonry buildings: Experimental results and comparison between shear failure criteria

Ferretti, Francesca; Ferracuti, Barbara; Mazzotti, Claudio; Savoia, Marco

doi:10.1016/j.conbuildmat.2018.11.246

Cited by 28 publications

(12 citation statements)

References 17 publications

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“…Shear strength resisting the lateral earthquake force stems from the bond called sliding shear strength and residual frictional force that develops after the failure of the bond at the interface of brick and mortar. Different experimental models and methods are used to determine the sliding shear strength and frictional force between mortar and brick such as shove (Ispir M. et al, 2010;Ferretti F. et al, 2019), Nuss, triplet, core (Rahman A. & Ueda T., 2013), Van der Pluijm (Pluijm R., 1992) etc.…”

Section: Inroductionmentioning

confidence: 99%

An Experimental Study To Determine Sliding Shear Strength And Internal Frictional Coefficient Of Clay Brick Wall In A Masonry Building

Odacioglu¹,

Doğan²

2019

Uluslararası Muhendislik Arastirma Ve Gelistirme Dergisi

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96% of the available buildings in use in Turkey are taking place in the earthquake zone and approximately 50% of them an masonry structures built using bricks. Sliding shear strength and internal friction coefficient were taken as a constant value in Turkish Earthquake Code (TSC 2007) depending on the type and hole rate of the brick section regardless of available compressive strength of the brick, mortar and plaster of a wall. But nowadays these values are recommended to be taken according to the compressive strength of mortar in TSC-2018. In addition, with this study it is recommended that, to evaluate the performance of a building against earthquake, the mechanical properties of the materials used for a building must be determined on site with series of tests. It is well-known that for each building mechanical properties of mortar and plaster are variable because of site work conditions.In this study, a couple of tests were conducted in different storeys of a five-storey-masonry building representing the clay brick masonry buildings in the country built in the 1950s, to determine the sliding shear strength and internal friction coefficient, using a similar method to shove test. With the increment of axially vertical load from upper storey to lower storey, the shear capacity in the lower storeys of the buidling are much lower than the respective values in upper storeys. In order to determine a characteristic shear force for the building, it has been revised considering the lowest compressive strength of mortar in the storeys. Related with the internal friction coefficient obtained, a quite good correlation was found between the results and the standards. However, the sliding shear strength was found to be approximately three times higher than TSC 2007 and about two times higher than TSC 2018. This means that, the limits recommended in the standards are much safer than results obtained from the tests.

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Section: Inroductionmentioning

confidence: 99%

An Experimental Study To Determine Sliding Shear Strength And Internal Frictional Coefficient Of Clay Brick Wall In A Masonry Building

Odacioglu¹,

Doğan²

2019

Uluslararası Muhendislik Arastirma Ve Gelistirme Dergisi

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“…The damages caused by the most severe earthquakes in recent decades, some of which catastrophic, have drawn attention to the problem of the vulnerability of the historical architectural heritage, consisting mostly of masonry buildings (Penna et al 2014;Penna 2015;Ferretti et al 2019a). For this reason, the interest in the strengthening of masonry structures has significantly grown especially concerning techniques that allow to perform reversible, compatible and sustainable interventions, guaranteeing an adequate level of safety for the buildings against vertical loads and even more against forces acting in a horizontal direction.…”

Section: Introductionmentioning

confidence: 99%

A discrete-cracking numerical model for the in-plane behavior of FRCM strengthened masonry panels

Murgo

Ferretti

Mazzotti

2021

Bull Earthquake Eng

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In this paper, the structural behavior of masonry panels strengthened with a system made up of composite fiber grids embedded in a cementitious matrix (FRCM) is presented. The non-linear behavior of the unreinforced and reinforced panels is numerically simulated by means of a simplified micro-modelling approach. This approach concentrates all the non-linearities and failures in the joints and in potential crack surfaces within the bricks, placed vertically in the middle of each brick. The FRCM strengthening system is discretized by a continuous bi-directional fiber grid constituted by trusses embedded into a cementitious matrix. A calibrated bond-slip relationship is applied between the fibers and the mortar matrix assuming an idealized bilinear law. The typical experimental load–displacement curve for a FRCM strengthened panel shows three principal phases that correspond to different failure mechanisms: masonry cracking, mortar matrix cracking and ultimate failure of the panel. The non-linear numerical analyses show a good agreement with experimental results and the modeling approach is found to be adequate to reproduce the described experimental behavior. The results of a parametric study on both the material and the geometrical properties of the FRCM system are also presented.

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“…The structural performances and the safety of historical masonry building during a seismic event are key aspects to be assessed, since these construction typologies usually show a weak behavior if subject to horizontal loads, characterized by out-of-plane and in-plane collapses [1,2]. Several researches in literature studied different retrofitting systems realized by using composite materials applied to the surface of masonry elements, in order to enhance the structural capacity with respect to the shear actions invoked during an earthquake without evident changes in stiffness.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Shear Behavior of FRCM Strengthened Masonry Panels

Ferretti¹,

Incerti²,

Mazzotti³

2021

12th International Conference on Structural Analysis of Historical Constructions

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Innovative strengthening solutions, such as Fiber Reinforced Cementitious Matrix (FRCM), are becoming increasingly diffused for the retrofitting of existing masonry structures with the aim of reducing the seismic vulnerability of these construction typologies. In recent years, many studies have demonstrated the suitability of these materials in enhancing the shear capacity of masonry walls and improve the overall structural behavior, avoiding fragile collapse mechanisms. In the present work, six diagonal compression tests were performed on unstrengthened and FRCM strengthened masonry panels to evaluate the improvements attributable to the presence of the FRCM systems. Two different bidirectional basalt grids were applied to the masonry samples, with and without mechanical anchorages. The tensile and bond properties of the chosen FRCM systems were investigated through laboratory tests. The objective was, indeed, to compare the performances of two textiles, characterized by different densities, and to investigate the role of mechanical anchorages. The experimental results confirmed the efficiency of the FRCM strengthening systems in improving the shear behavior of masonry panels. The FRCM strengthened samples experienced a considerable strength increase and less brittle failure mechanisms. The roles of both the mortar matrix, the fiber grids and the mechanical anchorages were highlighted by analyzing the onset of cracking and the failure propagation within the samples.

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Destructive and minor destructive tests on masonry buildings: Experimental results and comparison between shear failure criteria

Cited by 28 publications

References 17 publications

An Experimental Study To Determine Sliding Shear Strength And Internal Frictional Coefficient Of Clay Brick Wall In A Masonry Building

An Experimental Study To Determine Sliding Shear Strength And Internal Frictional Coefficient Of Clay Brick Wall In A Masonry Building

A discrete-cracking numerical model for the in-plane behavior of FRCM strengthened masonry panels

Experimental Study on the Shear Behavior of FRCM Strengthened Masonry Panels

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