Strengthening of compressed brick masonry walls with carbon composites

Witzany, Jiří; Zigler, Radek; Kroftová, Klára

doi:10.1016/j.conbuildmat.2016.03.026

Cited by 23 publications

(4 citation statements)

References 24 publications

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“…Due to the CFRP sheets attached to the front and back face of the masonry wallettes, no visible cracks were noted in the experimental test, as shown in Figure 12. Previous similar research studies on multiple thin CFRP strips layups on masonry walls [80,81] were verified to confirm the failure modes developed on the side and front/rear face of the wallettes. The failure modes on the sides with visible CFRP deformation buckling are shown in Figure 13a.…”

Section: Validation Of the Cfrp Fabric-strengthened Brick Wallettes U...mentioning

confidence: 61%

The Effectiveness of CFRP- and Auxetic Fabric-Strengthened Brick Masonry under Axial Compression: A Numerical Investigation

2022

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Bonded brickwork used for loadbearing walls is widely found in heritage structures worldwide. The evaluation of bonded masonry structures and their strengthening strategies against dynamic actions require appropriate understanding under cyclic loading. Subsequently, a simplified 3D microscale numerical model is developed in this paper to analyse bonded brickwork under cyclic compression. A plasticity-based damage constitutive model to represent damage in masonry bricks under cyclic compression loading was employed, and zero-thickness interfaces were considered with non-linear damage properties to simulate the mechanical behaviour of masonry. A threshold strain level was used to enact the element deletion technique for initiating brittle crack opening in the masonry units. The developed model was validated against the experimental results published by the authors in the past. The models were able to accurately predict the experimental results with an error limit of 10% maximum. Mainly, two types of strengthening materials, possessing (1) high energy absorption characteristics (auxetic fabric) and (2) high strength properties (carbon fibre reinforced polymer composites/CFRP) were employed for damage mitigation under cyclic compression. Results show that the CFRP-strengthened masonry failure was mainly attributed to de-bonding of the CFRP and crushing under compression. However, the auxetic strengthening is shown to significantly minimise the de-bonding phenomenon. Enhanced energy dissipation characteristics with relatively higher ductility (up to ~50%) and reduced damages on the bonded brickwork were observed as compared to the CFRP-strengthened brickwork under cyclic compression loading. Additionally, the auxetic fabric application also increased the compressive resistance of brickwork by 38–60% under monotonic loading, which is comparably higher than with the CFRP strengthening technique.

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Section: Validation Of the Cfrp Fabric-strengthened Brick Wallettes U...mentioning

confidence: 61%

The Effectiveness of CFRP- and Auxetic Fabric-Strengthened Brick Masonry under Axial Compression: A Numerical Investigation

2022

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“…The [NAKI I] project included extensive experimental research into the strengthening of masonry, stone, brick and mixed masonry pillars, walls and barrel vaults with composites based on high-strength, mainly carbon and glass, fibres and epoxy adhesives or polymer-modified cement mixes [7][8][9][10][11][12][13].…”

Section: Vault Failure Mechanismsmentioning

confidence: 99%

Experimental Research Into Dynamic Properties of Masonry Barrel Vaults Non-Reinforced and Reinforced With Carbon Composite Strips

Ziegler

Witzany

Makovička

et al. 2016

CEJ

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The study of dynamic behaviour of vaults of historic buildings reveals new knowledge which can be used for the local analysis and stabilisation and rehabilitation designs of damaged vaulted structures. The analysis of the results of dynamic loading brings objective background material for the identification and localisation of failures according to MAC or COMAC criteria [1, 2] and the assessment of serviceability and structural reliability of vaulted structures of historic buildings .

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“…) made with traditional materials is well described and mastered. Even modern materials with high utility properties are successfully implemented into the strengthening process -we can find the application of carbon rods or fabrics (Witzany et al, 2016, Jongsung et al, 2005. Even very modern material -textile reinforced concrete can be used for stabilization or strengthening of masonry structures (Garmendia et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Properties of Czech WW2 Concrete Fortifications after 80 Years

Holčapek¹,

Reiterman²,

Pazderka³

2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

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This paper deals with the investigation of properties of Czech fortification concrete bunkers built before Second World War (WWII). The Czech defense system consisted mainly of light bunkers type No. 37. The vast numbers of these bunkers have been preserved in various conditions to nowadays. The light bunkers type No. 37 were designed to last limited lifetime of decades. According to the preserved test protocols, strength of used concrete varied from 40 to 50 MPa, measured on cube specimens with dimensions 200×200×200 mm. There is an information, in general public, about high quality and strength of used concrete. The non-destructive analysis of compressive strength, determined by Schmidt hammer was performed. This method was used to maintain a historical value of the structures. Three were analyzed different bunkers type No. 37 located in Western Bohemia-Pilsner region. Tested bunkers are preserved in various conditions with various quality of concrete. The measurements by Schmidt hammer took place in several locations especially in the interior part. The exterior was also investigated but only in the locations of surface which were not covered with camouflage plaster. Non-destructive testing had shown high quality of concrete older than 80 years old concrete, with compressive strength between 50 to 60 MPa. On the other hand, based on the visual assessment, the concrete showed very different characteristics, especially in compactness and the quality of surface layer. We can find places with insufficiently compacted concrete with exposed steel reinforcement.

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Strengthening of compressed brick masonry walls with carbon composites

Cited by 23 publications

References 24 publications

The Effectiveness of CFRP- and Auxetic Fabric-Strengthened Brick Masonry under Axial Compression: A Numerical Investigation

The Effectiveness of CFRP- and Auxetic Fabric-Strengthened Brick Masonry under Axial Compression: A Numerical Investigation

Experimental Research Into Dynamic Properties of Masonry Barrel Vaults Non-Reinforced and Reinforced With Carbon Composite Strips

Properties of Czech WW2 Concrete Fortifications after 80 Years

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