scholarly journals Strengthening of Masonry Walls Using Hybrid-fiber Engineered Cementitious Composite

2009 ◽  
Vol 44 (8) ◽  
pp. 1007-1029 ◽  
Author(s):  
V.W.J. Lin ◽  
S.T. Quek ◽  
M.P. Nguyen ◽  
M. Maalej
Keyword(s):  
Masonry Walls ◽  
Cementitious Composite ◽  
Hybrid Fiber ◽  
Engineered Cementitious Composite

Enhancing the out-of-plane behaviour of unreinforced masonry walls under impact loading through the use of partially bonded layers of engineered cementitious composite

2019 ◽  
Vol 11 (2) ◽  
pp. 209-234
Author(s):  
Saeed Pourfalah ◽  
Demetrios M Cotsovos
Keyword(s):  
Impact Loading ◽  
Composite Layer ◽  
Unreinforced Masonry ◽  
Masonry Walls ◽  
Full Potential ◽  
Cementitious Composite ◽  
Premature Failure ◽  
Engineered Cementitious Composite ◽  
Composite Layers ◽  
Out Of Plane

Published experimental work reveals that the out-of-plane behaviour of unreinforced masonry walls under impact loading can be significantly enhanced through the use of engineered cementitious composite layers fully bonded to the surface of the masonry. The disadvantage of this method is associated with the localised cracking exhibited by the engineered cementitious composite layer close to the joints forming between bricks. This cracking is associated with the bond developing between the masonry and the engineered cementitious composite layer and does not allow the latter layer to achieve its full potential, thus resulting in its premature failure. In an attempt to address this problem, a series of drop-weight tests were carried on masonry prismatic specimens strengthened with a layer of engineered cementitious composite partially bonded to the surface of the masonry acting in tension. The latter prismatic specimens consist of a stack of bricks connected with mortar joints. The specimens are considered to provide a simplistic representation of a vertical strip of a masonry wall subjected to out-of-plane actions associated with impact or blast loading. Analysis of the test data reveals that under impact loading, the specimens retrofitted with partially bonded engineered cementitious composite layers can exhibit a more ductile performance compared to that exhibited by the same specimens when strengthened with fully bonded layers of engineered cementitious composite. This is attributed to the fact that along its unbonded length, the engineered cementitious composite layer is subjected to purely uniaxial tension (free from any interaction with the surface of the masonry), allowing for the development of multiple uniformly distributed fine cracks.

Material Properties of a New Hybrid-Fiber Engineered Cementitious Composite

2012 ◽  
Vol 450-451 ◽  
pp. 433-438
Author(s):  
Phillip Hermes ◽  
Yi Xia Zhang ◽  
Khin Soe ◽  
Joel Bell
Keyword(s):  
Compressive Strength ◽  
Material Properties ◽  
Elasticity Modulus ◽  
Modulus Of Rupture ◽  
Strain Rates ◽  
Cementitious Composite ◽  
Hybrid Fiber ◽  
Normal Concrete ◽  
Engineered Cementitious Composite ◽  
Concrete Mix

A new hybrid-fiber Engineered Cementitious Composite (ECC) containing 1.25% steel (SE) fibers and 0.75% Polyvinyl Alcohol (PVA) fibers is proposed, and material properties of the new ECC mix are tested in this paper. The compressive strength, modulus of elasticity, modulus of rupture and tensile properties under various strain rates of the new hybrid-ECC mix are investigated experimentally. The tested results are compared with those for a normal concrete mix, as well as those for other mono-fiber and hybrid-fiber ECCs reported in other literatures.

scholarly journals Cyclic Behavior of Masonry Shear Walls Retrofitted with Engineered Cementitious Composite and Pseudoelastic Shape Memory Alloy

Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 511
Author(s):  
Alireza Tabrizikahou ◽  
Mieczysław Kuczma ◽  
Magdalena Łasecka-Plura ◽  
Ehsan Noroozinejad Noroozinejad Farsangi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Shear Walls ◽  
Absorption Capacity ◽  
Cyclic Behavior ◽  
Masonry Walls ◽  
Cementitious Composite ◽  
Energy Absorption Capacity ◽  
Engineered Cementitious Composite ◽  
Mesh Density

The behavior of masonry shear walls reinforced with pseudoelastic Ni–Ti shape memory alloy (SMA) strips and engineered cementitious composite (ECC) sheets is the main focus of this paper. The walls were subjected to quasi-static cyclic in-plane loads and evaluated by using Abaqus. Eight cases of strengthening of masonry walls were investigated. Three masonry walls were strengthened with different thicknesses of ECC sheets using epoxy as adhesion, three walls were reinforced with different thicknesses of Ni–Ti strips in a cross form bonded to both the surfaces of the wall, and one was utilized as a reference wall without any reinforcing element. The final concept was a hybrid of strengthening methods in which the Ni–Ti strips were embedded in ECC sheets. The effect of mesh density on analytical outcomes is also discussed. A parameterized analysis was conducted to examine the influence of various variables such as the thickness of the Ni–Ti strips and that of ECC sheets. The results show that using the ECC sheet in combination with pseudoelastic Ni–Ti SMA strips enhances the energy absorption capacity and stiffness of masonry walls, demonstrating its efficacy as a reinforcing method.

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