Retrofitting RC infills by a glass fiber mesh reinforced overlay and steel dowels: experimental and numerical study

Facconi, Luca; Minelli, Fausto

doi:10.1016/j.conbuildmat.2019.117133

Cited by 20 publications

(12 citation statements)

References 23 publications

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“…Assessment of seismic performance of IRC frame structure requires proper modeling techniques and reliable analytical equations to correctly predict force-displacement parameters of infill walls [15]. Several existing IRC frame structures are nowadays vulnerable to seismic actions as a result of improper and poor understanding of such phenomena [16].…”

Section: Introductionmentioning

confidence: 99%

Effects of Infills in the Seismic Performance of an RC Factory Building in Pakistan

et al. 2021

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Infilled reinforced concrete (IRC) frames are a very common construction typology, not only in developing countries such as Pakistan but also in southern Europe and Western countries, due to their ease of construction and less technical skills required for the construction. Their performance during past earthquakes has been in some cases satisfactory and in other cases inadequate. Significant effort has been made among researchers to improve such performance, but few have highlighted the influence of construction materials used in the infill walls. In some building codes, infills are still considered as non-structural elements, both in the design of new buildings and, sometimes, in the assessment of existing buildings. This is mainly due to some difficulties in modeling their mechanical behavior and also the large variety of typologies, which are difficult to categorize. Some building codes, for example, Eurocode, already address the influence of infill walls in design, but there is still a lack of homogeneity among different codes. For example, the Pakistan building code (PBC) does not address infills, despite being a common construction technique in the country. Past earthquake survey records show that construction materials and infill types significantly affect the seismic response of buildings, thus highlighting the importance of investigating such parameters. This is the object of this work, where a numerical model for infill walls is introduced, which aims at predicting their failure mode, as a function of some essential parameters, such as the friction coefficient between mortar and brick surface and mortar strength, usually disregarded in previous models. A comprehensive case study is presented of a three-story IRC frame located in the city of Mirpur, Pakistan, hit by an earthquake of magnitude 5.9 on 24 September 2019. The results obtained from the numerical model show good agreement with the damage patterns observed in situ, thus highlighting the importance of correctly modeling the infill walls when seismically designing or assessing Pakistani buildings that make use of this technology.

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Section: Introductionmentioning

confidence: 99%

Effects of Infills in the Seismic Performance of an RC Factory Building in Pakistan

et al. 2021

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“…The behavior of masonry walls depends on the relationship between its component's properties and the efforts to which they are subjected. Reinforced coatings can be used to improve the performance of these elements in rehabilitation and retrofitting or to provide higher strengths under special load conditions, such as seismic activity [11][12][13]. The mesh reinforcement is usually applied in discrete parts of the buildings and may be used as emergency repair or as a permanent strengthening method [30].…”

Section: Strengthening and Retrofittingmentioning

confidence: 99%

“…And as retrofit for historic buildings, when the use of epoxy resins is not allowed or suitable, as in stone masonry or reversible applications [3,30,47,49]. The revised documents also covered masonry rehabilitation, the increase of load capacity on structural bearing walls [11,46], retrofit due to seismic activity [3,7,10,12,13,22,30,45,47,49,50], coating influence in compressive strength [6], and reinforcement of arches and masonry vaults [51]. A recent study also covered a detailed characterization of AFG meshes for reinforcement use [51].…”

Section: Strengthening and Retrofittingmentioning

confidence: 99%

“…Masonry performance can be improved even more if reinforcing meshes are embedded in the coating layer, a technique known for its low cost, ease of execution, and high compatibility with multiple materials [8][9][10]. This procedure provides greater mechanical strength for masonries under multiple load conditions and many studies suggest it is suitable for repair, retrofitting, and reinforcement applications, as well as seismic strengthening of non-structural infill walls [7,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Mesh reinforcement in masonry mortar coatings: a systematic literature review

Coelho

Silva

2023

Cerâmica

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Mortar coatings have a major influence on a building's aesthetics, valorization, and habitability, with significant effects on the mechanical behavior of masonry walls. Multiple types of meshes can be embedded in plaster to enhance both masonry and coating's mechanical behavior, restrain crack formation, enhance the bonding between layers, and increase the wall's seismic resistance. The reinforcement technique has simple execution and is suitable for many applications, including the strengthening of non-load bearing walls, façade performance improvement, and restoration of historical buildings. However, there is an absence of guidelines and specifications for design and execution, resulting in high variability in field applications due to the many variables involved and few in-depth studies. This paper presents a systematic review of the effects of mesh reinforcement in cementitious mortar coatings and its major applications. Mortar and mesh parameters and influences, the status of analytical and simulation models, and suggestions for future research are described.

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“…Assessment of seismic performance of IRC frames requires proper modeling techniques and reliable analytical equations to correctly predict their response [15]. Many existing IRC frames are more vulnerable to seismic actions as a result of improper and poor understanding of such features [16]. Some usually neglected parameters, such as friction coefficient between mortar and brick surface, mortar strength, and their effects on the seismic performance of IRC frames are not reported in the literature, despite their strong influence on the failure mode of infill walls [17].…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance of Pakistani-Technique Infilled Reinforced Concrete Frames

Khan¹,

Bergami²,

Nuti³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Infilled reinforce concrete (IRC) frames are commonly built across the world. Modern building codes address the influence of infill walls in seismic design and assessment of existing structures. Other building codes commonly consider infill walls as non-structural elements and do not require any explicit verification. One of such codes is the Pakistan Building Code (PBC), which does not foresee recommendations and guidelines for IRC frame structures, despite being a common construction typology in the Country. Records of past earthquakes show that infill types and material properties strongly affect the seismic response of buildings thus highlighting the importance of such parameters and making the topic worth investigating in detail. This paper introduces a numerical model for infill walls, which predicts different features of the nonlinear response, such as cracking, peak force, failure and residual force. Such features are expressed as function of infill friction coefficient between mortar and brick surface and mortar strength, whose effects are commonly neglected in available numerical models. The model is applied to a comprehensive case study of a three-story IRC frame factory building, located in the city of Mirpur, Pakistan, hit by an earthquake of magnitude 5.9 on 24 September 2019. The results obtained the model show good agreement with the observed in-situ damage patterns, thus revealing the importance of correctly modeling the infill walls when seismically designing and assessing Pakistani IRC buildings.

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Retrofitting RC infills by a glass fiber mesh reinforced overlay and steel dowels: experimental and numerical study

Cited by 20 publications

References 23 publications

Effects of Infills in the Seismic Performance of an RC Factory Building in Pakistan

Effects of Infills in the Seismic Performance of an RC Factory Building in Pakistan

Mesh reinforcement in masonry mortar coatings: a systematic literature review

Seismic Performance of Pakistani-Technique Infilled Reinforced Concrete Frames

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