scholarly journals Diagonal Compression Test of Mortar Interlocking Masonry Walls With Various Block Shapes and Different Support Conditions

2020 ◽  
Vol 6 ◽  
Author(s):  
Aiko Furukawa ◽  
Keiya Masuda ◽  
Junji Kiyono
Keyword(s):  
Compression Test ◽  
Masonry Walls ◽  
Diagonal Compression ◽  
Support Conditions

scholarly journals Experimental and Numerical Investigations on the Behaviour of Masonry Walls Reinforced with an Innovative Sisal FRCM System

2017 ◽  
Vol 747 ◽  
pp. 190-195 ◽  
Author(s):  
Claudia Brito de Carvalho Bello ◽  
Antonella Cecchi ◽  
Emilio Meroi ◽  
Daniel V. Oliveira
Keyword(s):  
Numerical Investigation ◽  
Compression Test ◽  
Composite System ◽  
Numerical Approach ◽  
Masonry Walls ◽  
Test Results ◽  
Numerical Investigations ◽  
Cementitious Matrix ◽  
Diagonal Compression ◽  
Sisal Fibers

An experimental and numerical investigation on an innovative composite reinforced with sisal fibers for masonry strengthening is presented in this paper. A FEM numerical approach is also developed, based on diagonal compression test results, to simulate the shear in-plane response of unreinforced masonry panels (URM) and masonry strengthened with a Fibre Reinforced Cementitious Matrix (FRCM) composite system made with sisal fibers (RM-SISAL).

scholarly journals The Effect of Transversal Connection in the in-Plane Response of Double-Leaf Brick Masonry Walls

2021 ◽  
Author(s):  
Lorenzo Scandolo ◽  
Stefano Podestà
Keyword(s):  
Structural Safety ◽  
Masonry Walls ◽  
Masonry Building ◽  
Mechanical Parameters ◽  
Compression Tests ◽  
Knowledge Process ◽  
Diagonal Compression ◽  
Set Up ◽  
Definition Of ◽  
Simplified Mechanical Model

Abstract The evaluation of structural safety derives from the knowledge of material properties. In case of existent masonry building, the definition of reliable mechanical parameters could be a very difficult task to be achieved. For this reason, an estimation of these values is useful, for example it is the first phase of the knowledge process, for simplified mechanical model or when NTD test is the only possibility.The transversal connection in masonry panels is a technological detail that affects the static and seismic behavior and could significantly increase the strength of the element.In this paper the effect of transversal connection in double-leaf brickwork masonry panels is evaluated by diagonal compression tests. To achieve this goal, a new set-up was designed to load each leaf independently.The results have shown an increment of about 20% in strength if transversal connection is present. If the leaves have very different mechanical parameters, the tests highlight an unexpected behavior.

Diagonal Compression of Masonry Walls Strengthened with Composite Reinforced Mortar

2019 ◽  
Vol 817 ◽  
pp. 528-535 ◽  
Author(s):  
Tommaso D'Antino ◽  
Francesca Giulia Carozzi ◽  
Carlo Poggi
Keyword(s):  
Weight Ratio ◽  
High Strength ◽  
Organic Matrix ◽  
Masonry Walls ◽  
Matrix Composites ◽  
The North ◽  
Crm System ◽  
Diagonal Compression ◽  
Promising Solution ◽  
Inorganic Matrix

The use of inorganic matrix composites to strengthen and retrofit existing masonry and concrete structures has been gaining increasing interest in the last years. Among them, composite reinforced mortar (CRM) systems are a promising solution to increase the shear and flexural capacity of masonry panels. CRMs are comprised of a relatively thin inorganic matrix layer reinforced with a bi-dimensional grid made with high-strength fibers impregnated with an organic matrix. They are compatible with the substrate due to the use of inorganic matrix, have good durability and high-strength-to weight ratio due to the use of reinforcing composite materials. CRM systems are still in their infancy and limited research is available in the literature. In this paper, masonry walls constructed with historical bricks typical of the north of Italy were strengthened with a CRM system including a glass composite grid and a lime-based mortar and were subjected to diagonal compression. Three walls were strengthened with the CRM and one was used as a control specimen. The results obtained showed that the CRM system significantly increased the shear strength of the masonry panels subjected to diagonal compression.

FRCM Strengthened Masonry Panels: The Role of Mechanical Anchorages and Symmetric Layouts

2017 ◽  
Vol 747 ◽  
pp. 334-341 ◽  
Author(s):  
Francesca Ferretti ◽  
Andrea Incerti ◽  
Barbara Ferracuti ◽  
Claudio Mazzotti
Keyword(s):  
Masonry Walls ◽  
Fiber Reinforced ◽  
Compression Tests ◽  
Fiber Reinforced Composite ◽  
Single Leaf ◽  
Reinforced Composite ◽  
Experimental Campaign ◽  
Diagonal Compression ◽  
Strength And Ductility

The use of fiber reinforced composite materials for the retrofitting of existing masonry buildings is investigated in this paper. Indeed, they represent a great alternative to traditional strengthening techniques for the improvement of the seismic performance of masonry walls. Focusing on the in-plane behavior of masonry, an experimental campaign is here presented with the objective of studying the efficiency of different strengthening solutions. Diagonal compression tests were conducted on single-leaf masonry panels reinforced with Fiber Reinforced Cementitious Matrix (FRCM) using different fibers typologies and layouts. Glass or carbon fiber grids embedded in a lime-based mortar matrix were applied on one or both sides of masonry panels, with or without mechanical anchorages. The comparison of the different strengthening techniques is analyzed in terms of failure mode, strength and ductility. The results are then discussed considering the provisions and design formula proposed for FRP strengthening by the Italian CNR Guidelines.

The Effects of Strengthening the AAC Walls Using Glass Mesh Arranged in Different Configurations

2019 ◽  
Vol 817 ◽  
pp. 442-449
Author(s):  
Marta Kałuża ◽  
Jan Kubica
Keyword(s):  
Residential Buildings ◽  
Natural Material ◽  
Masonry Walls ◽  
Masonry Structures ◽  
Effective Solution ◽  
Modes Of Failure ◽  
Diagonal Compression ◽  
External Strengthening ◽  
Concrete Blocks ◽  
Aerated Concrete

The usage of AAC (Autoclaved Aerated Concrete) blocks for the construction of new masonry structures, particularly low-rise residential buildings, has become very popular in Poland. It provides an uncomplicated erecting method, which is characterized by thin bed joints and unfilled head joins, but at the same time, makes these walls very sensitive to any internal tensile stresses, causing damage with varying intensity. To avoid premature cracking, leading to a brittle failure of existing walls, an external strengthening can be an acceptable and effective solution. Taking into account that AAC units are a natural material, the application of a FRCM system (instead of FRP) is more suitable here. This system uses a mineral-based matrix that provides congenial compatibility with a masonry substrate.This study presents an analysis of the influence of superficial strengthening on the behaviour and deformability of masonry walls made of AAC blocks. A typical glass mesh (most often used in thin external plastering) and mineral mortar dedicated to renovation works are used as strengthening materials. The specimens are strengthened unilaterally (two types) or bilaterally and are subjected to diagonal compression according to the RILEM 76-LUM standard. The consecutive work stages, shear strains and modes of failure are described and discussed.

scholarly journals Influence of laminate direction and glue area on in-plane shear modulus of cross-laminated timber

2020 ◽  
Vol 2 (12) ◽  
Author(s):  
Jonas Turesson ◽  
Zahra Sharifi ◽  
Sven Berg ◽  
Mats Ekevad
Keyword(s):  
Finite Element ◽  
Shear Modulus ◽  
Compression Test ◽  
Contact Area ◽  
Tall Buildings ◽  
Shear Stiffness ◽  
Finite Element Simulations ◽  
Plane Shear ◽  
Cross Laminated Timber ◽  
Diagonal Compression

AbstractThe use of cross-laminated timber (CLT) in constructing tall buildings has increased. So, it has become crucial to get a higher in-plane stiffness in CLT panels. One way of increasing the shear modulus, G, for CLT panels can be by alternating the layers to other angles than the traditional 0° and 90°. The diagonal compression test can be used to measure the shear stiffness from which G is calculated. A general equation for calculating the G value for the CLT panels tested in the diagonal compression test was established and verified by tests, finite element simulations and external data. The equation was created from finite element simulations of full-scale CLT walls. By this equation, the influence on the G value was a factor of 2.8 and 2.0 by alternating the main laminate direction of the mid layer from the traditional 90° to 45° and 30°, respectively. From practical tests, these increases were measured to 2.9 and 1.8, respectively. Another influence on the G value was studied by the reduction of the glue area between the layers. It was shown that the pattern of the contact area was more important than the size of the contact area.

Destructive Tests for the Determination of Masonry Performance

2009 ◽  
Vol 417-418 ◽  
pp. 753-756
Author(s):  
Lucio Nobile ◽  
Cristina Gentilini ◽  
Veronica Bartolomeo ◽  
Mario Bonagura
Keyword(s):  
Mechanical Properties ◽  
Experimental Research ◽  
State Of The Art ◽  
The State ◽  
Masonry Walls ◽  
Compression Tests ◽  
Diagonal Compression

Several masonry panels are studied by means of destructive tests such as compressive, diagonal compression and shear-compression tests. The experimental research allows to characterize the mechanical properties of masonry walls in order to assess the masonry performance. Moreover, a brief recall of the most important experimental progress is presented in order to understand the state of the art of the research in the field of destructive tests.

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