In-plane shear strengthening of brick masonry panel with geogrid reinforcement embedded in bed and bed-head joints mortar

2021 ◽  
Vol 227 ◽  
pp. 111411
Author(s):  
Biplab Behera ◽  
Radhikesh Prasad Nanda
Keyword(s):  
Brick Masonry ◽  
Shear Strengthening ◽  
Plane Shear ◽  
Geogrid Reinforcement

scholarly journals In-plane Shear Strengthening of Unreinforced Masonry Walls Using GFRP Jacketing

2017 ◽  
Author(s):  
Enea Mustafaraj ◽  
Yavuz Yardim
Keyword(s):  
Experimental Results ◽  
Test Results ◽  
Compression Tests ◽  
Shear Strengthening ◽  
Plane Shear ◽  
Standard Size ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Diagonal Compression ◽  
Before And After

In this paper, it is presented the experimental results of a campaign on diagonal compression tests, as of ASTM E519-02, to assess and compare the in-plane behavior of standard size of 1200 × 1200 × 250 mm, for three unreinforced and three reinforced wall panels by glass fiber reinforced polymer (GFRP) embedded in an inorganic matrix.From the diagonal compression test results, were determined some of the main mechanical parameters such as: shear strength, modulus of rigidity and ductility, before and after application of the reinforcement.The experimental results showed that the GFRP reinforced panels exhibited a significant increase of 127% in shear resistance, 1100% in ductility and 650% in modulus of rigidity when compared to unreinforced panels.It was concluded that this technique provided satisfactory results and can be considered a suitable method for repair of masonry structures.

Geogrid Reinforced Brick Buildings for Earthquake Disaster Mitigations

2021 ◽  
Author(s):  
Biplab Behera ◽  
Radhikesh Prasad Nanda
Keyword(s):  
Transverse Wall ◽  
Plane Shear ◽  
Qualitative Comparison ◽  
Geogrid Reinforcement ◽  
Building Model ◽  
Single Room ◽  
Out Of Plane ◽  
Lateral Strength ◽  
Diagonal Crack ◽  
Complete Collapse

Abstract In the event of a severe earthquake, the walls of brick buildings experience in-plane shear and out-of-plane bending, leading to diagonal crack and corner failure respectively. In this study, an experimental investigation was carried to observe the above damages on brick masonry buildings reinforced with geogrid embedded in bed joint mortar of the walls. It was observed that the geogrid reinforced brick panels showed better shear strength, lateral strength, ductility, etc. A qualitative comparison was made using a sinusoidal shake table test on a one-fourth single-room building model consisting of two sets of corner walls with and without geogrid reinforcement. It was observed that the corner wall without reinforcement showed crack initiation at 0.45g and complete collapse with over toppling of the transverse wall at 0.90g, while no sign of damages for the corner walls strengthened with geogrid reinforcement for any level of shaking.

scholarly journals Experimental Investigation on the Performance of Historical Squat Masonry Walls Strengthened by UHPC and Reinforced Polymer Mortar Layers

2019 ◽  
Vol 9 (10) ◽  
pp. 2096 ◽  
Author(s):  
Bin Peng ◽  
Sandong Wei ◽  
Libo Long ◽  
Qizhen Zheng ◽  
Yueqiang Ma ◽  
...  
Keyword(s):  
High Performance Concrete ◽  
Brick Masonry ◽  
Masonry Walls ◽  
Strengthening Effect ◽  
Plane Shear ◽  
Historical Building ◽  
Reinforced Polymer ◽  
Polymer Mortar ◽  
Historical Masonry ◽  
Squat Walls

Strengthening historical brick masonry walls is important because these walls are major load-bearing members in many architectural heritages. However, historical brick masonry has low elastic modulus and low strength, historical masonry walls are prone to surface treatment or other structural intervention, and some of the walls lack integrity. These characteristics make effective strengthening of historical masonry walls difficult. To address the issue, strengthening layers made up of ultra-high performance concrete (UHPC) are potentially useful. To investigate the strengthening effect of the UHPC layers, the authors constructed three squat walls using historical bricks and mortar collected from the rehabilitation site of a historical building, and strengthened two of the walls with a UHPC layer and a reinforced polymer mortar layer respectively. The three walls were broken down by horizontal cyclic force along with constant vertical compression, and then the unstrengthened one was strengthened in-situ by a UHPC layer and was tested again. The experimental results indicate that the UHPC layers significantly improved the in-plane shear resistance and cracking load of the squat walls, without decreasing the walls’ ultimate deformation. They effectively strengthened both moderately and severely damaged historical masonry walls, because the UHPC filled the existing damages and improved the integrity of the masonry substrate. In addition, the UHPC layers intervened the historical walls less than the reinforced polymer mortar layer. Therefore, the UHPC layers are efficient in strengthening historical squat masonry walls.

scholarly journals In plane Shear Strengthening of Clay Masonry Walls with Opening

2020 ◽  
Vol 7 (1) ◽  
pp. 62-81
Author(s):  
Ahmed Abdulqadir ◽  
◽  
Jalal Saeed ◽  
Keyword(s):  
Masonry Walls ◽  
Shear Strengthening ◽  
Plane Shear

Analysis and modelling of the in-plane shear behaviour of hollow brick masonry panels

2006 ◽  
Vol 20 (5) ◽  
pp. 308-321 ◽  
Author(s):  
A. Gabor ◽  
E. Ferrier ◽  
E. Jacquelin ◽  
P. Hamelin
Keyword(s):  
Brick Masonry ◽  
Shear Behaviour ◽  
Plane Shear ◽  
Hollow Brick

In-Plane Behavior of BFRP Sheets Bonded to Damaged RC-Brick Masonry Walls with Opening

2014 ◽  
Vol 684 ◽  
pp. 195-201
Author(s):  
Zhen Lei ◽  
Yong Wang ◽  
Jun Tong Qu
Keyword(s):  
Energy Dissipation ◽  
Masonry Wall ◽  
Shear Loading ◽  
Brick Masonry ◽  
Masonry Walls ◽  
Deformation Capacity ◽  
Plane Shear ◽  
Lateral Strength ◽  
Strength And Deformation ◽  
Energy Dissipation Capacity

FRP strength technique can increase the lateral strength of masonry walls, but the effect of the presence of pre-damage in the walls before retrofitted has not been studied. In this study, the experimental results from two half-scale RC-brick masonry walls with opening retrofitted with BFRP composite strips are presented. One wall was initially damaged in shear loading up to its maximum strength, and then repaired with BFRP sheets; another one was directly strengthened with BFRP sheets in the same strengthening configuration. All the walls were subjected to cyclic in-plane shear loading up to failure. Compared to the strengthened walls, the repaired masonry wall has almost the same failure mode and FRP strain rule, and slightly lower lateral strength and deformation capacity as well as energy dissipation capacity.

Analysis of the in-plane shear behaviour of FRP reinforced hollow brick masonry walls

2005 ◽  
Vol 19 (3) ◽  
pp. 237-260 ◽  
Author(s):  
A. Gabor ◽  
E. Ferrier ◽  
E. Jacquelin ◽  
P. Hamelin
Keyword(s):  
Brick Masonry ◽  
Shear Behaviour ◽  
Masonry Walls ◽  
Plane Shear ◽  
Hollow Brick

Comparison of Different FE Modeling for In-Plane Shear Strengthening of Brittle Masonry with FRCM

2019 ◽  
Vol 817 ◽  
pp. 65-72 ◽  
Author(s):  
Claudio D'Ambra ◽  
Gian Piero Lignola ◽  
Andrea Prota ◽  
Elio Sacco
Keyword(s):  
Failure Modes ◽  
Masonry Wall ◽  
Shear Capacity ◽  
Shear Strengthening ◽  
Plane Shear ◽  
Premature Failure ◽  
Reinforced Masonry ◽  
The Matrix ◽  
Strength Increment

Few design oriented models on strengthening of unreinforced masonry (URM) panels under in-plane actions with composite systems are currently available (among them, the pioneers researches [1, 2] and the guidelines [3, 4] for FRPs). Usually, the in-plane shear capacity of a strengthened panel is evaluated as the sum of two terms: the contribution of URM masonry and that of the composite strengthening system (usually only the fibers are considered, also in the case of inorganic matrix, as illustrated in [5, 6, 7], neglecting the shear contribution of the matrix). Mostly, the models proposed to compute the strength increment of the URM can be seen as extensions of provisions for steel-reinforced masonry, where the reinforcement is modeled by the truss analogy [8] and an effective ultimate strain is introduced to account for premature failure of fibers in shear applications. However, the development of the ideal truss in a masonry wall is strongly conditioned by a proper anchorage of fibers and availability of a fiber grid, which is not always ensured. Several failure modes can be expected for strengthened masonry, like diagonal splitting cracking, sliding of a portion over the other, so that the contribution of the composite can be engaged in different ways. The aim of this study is to compare different modeling strategies in the numerical field accounting for matrix as a continuum or as a stiffening of individual fibers, and to provide novel FEM analyses revealing the different role of fiber orientations and matrix properties.

Numerical modeling of confined brick masonry structures with parametric analysis and energy absorption calculation

2020 ◽  
pp. 204141962094773
Author(s):  
H Asfandyar Ahmed ◽  
Khan Shahzada
Keyword(s):  
Energy Absorption ◽  
Structural Response ◽  
Damage Mechanism ◽  
Lateral Load ◽  
Masonry Structure ◽  
Brick Masonry ◽  
Masonry Structures ◽  
Plane Shear ◽  
Modeling Approach ◽  
Macro Modeling

The objective of this paper is to propose a new modeling methodology for numerical analysis of full-scale confined brick masonry structures. Two modeling strategies are used within a single structure, where the in-plane walls are modeled using “simplified micro-modeling” approach and out-of-plane walls are modeled using “macro-modeling” approach. The lateral load capacity is associated with the in-plane shear resistance of masonry elements, therefore more detailed analysis is required for in-plane walls to achieve a comprehensive understanding of the damage mechanism and load transfer. The investigation of the in-plane shear behavior of confined brick masonry structures is of significant importance. Additionally, the proposed hybrid model is validated by comparing the results of experimental studies of confined brick masonry structure. A parametric study is then conducted to investigate the effect of brick and mortar properties on the structural response metrics (e.g. base shear coefficient, effective stiffness, response modification factor, the three performance levels (i.e. Immediate Occupancy, Life Safety and Collapse Prevention limits) and the energy absorption properties). It is observed that these structural response metrics, changed considerably by varying the material properties. Apart from that, the damage behavior and damage pattern are also assessed for the better understanding of effect of these parameters on the response of the structure. The proposed hybrid-modeling approach gives sufficient accuracy in predicting the lateral load behavior as well as the damage mechanism of confined brick masonry structure, subjected to lateral loading.

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