Efficiency of strengthening techniques assessed for existing masonry buildings

Diz, Sérgio; Costa, Aníbal; Costa, Alexandre A.

doi:10.1016/j.engstruct.2015.07.017

Cited by 17 publications

(15 citation statements)

References 14 publications

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“…Similarly to [19], an analysis of the cost/benefit ratio has been carried out. The construction costs of each solution have been measured, using a Spanish construction cost database [60].…”

Section: Methodsmentioning

confidence: 99%

“…In this case, the grids are composed of welded wire meshes and covered with micro concrete mortar [18]. A second solution implements a reinforced plaster with grids of intermediate diameters (4 to 6 mm) anchored to both wall’s faces [19]. A third solution is based on the use of shotcrete.…”

Section: Introductionmentioning

confidence: 99%

“…These techniques have been analysed in different studies to test their effectiveness. In [19], the global seismic response of reinforced plaster grids was tested. The authors compared the maximum displacements, the inter-storey drifts and the maximum stresses.…”

Section: Introductionmentioning

confidence: 99%

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Optimal seismic retrofitting techniques for URM school buildings located in the southwestern Iberian peninsula

et al. 2019

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This paper aims to study different seismic retrofitting techniques to test the reduction of the seismic vulnerability of unreinforced masonry buildings. Three techniques have been considered in a case study: adding steel or carbon fibre reinforced polymer grids in the walls and steel encirclements in the openings. The performance-based method has been used to that purpose. Nonlinear static analyses have been performed to obtain the capacity and fragility curves, the performance point and the damage level states. Moreover, an analysis of the cost-benefit ratio has been carried out. Results have shown that the three techniques have produced considerable improvements. The addition of encirclements has reduced the deformation resulting in a slight increase of the structure’s stiffness. Adding steel grids has produced the maximum peak strength increase while adding polymer grids has produced the largest ultimate displacements. Adding encirclement has had the best cost-benefit ratio.

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“…Similarly to [19], an analysis of the cost/benefit ratio has been carried out. The construction costs of each solution have been measured, using a Spanish construction cost database [60].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimal seismic retrofitting techniques for URM school buildings located in the southwestern Iberian peninsula

et al. 2019

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“…Traditional techniques, such as the local reconstructions (patching) of the masonry, the repairing of cracks by means of metal ties inserted into horizontal joint to tie across vertical cracks, the injection into the masonry of cement grout or lime-based mixtures (Modena 1994, Binda et al 1997, steel-mesh jacketing , Ashraf et al 2012, Diz et al 2015 may present similar limits and problems. Grout injections is an effective reinforcement method to increase lateral capacity of historic stonewalls.…”

Section: Introductionmentioning

confidence: 99%

The Reticulatus method for shear strengthening of fair-faced masonry

Corradi

Borri

Castori

et al. 2016

Bull Earthquake Eng

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This paper presents the results of several experimental campaigns recently carried out by the authors and devoted to the investigation of the mechanical performance of wall panels strengthened by applying repointing mortar and high strength stainless steel or composite cords. The reinforcement system, known as Reticulatus, allows the reinforcement of regular and irregular-shape masonry walls, when the fair-faced aspect must be kept. In the perspective of using this reinforcement method, this article summarizes the research that has been done so far, presenting new original test results and discussing the design procedures. Twenty-two square wall panels were loaded in their plane by means of a single point load acting through the panel's diagonal. Experimental results are presented for four types of cord 2 reinforcement using matched samples, reinforced and not. Increases in shear strength from 15 to 170% were achieved for the strengthened panels. Each wall panel was loaded well into the lateral post-elastic regime and then unloaded.Experimental results were in good agreement with predictions from simple models which assume the wall panels to behave like a plate, neglecting the contribution of the repointing mortar, and accounting for the non-linear behavior of the masonry.

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“…These "C" or "L" steel profiles make it easier to set up new floors as well as creating a connection between vertical and horizontal elements. The connection between parallel walls and the floor/roof, using steel plates and wooden beams as connecting elements is one of the techniques of seismic reinforcement proposed by Diz and Costa for supporting masonry buildings in the Azores [40].…”

Section: Strategies For Seismic and Energy Improvement Of Historical mentioning

confidence: 99%

Seismic and Energy Retrofit of the Historic Urban Fabric of Enna (Italy)

Basiricò

Enea

2018

Sustainability

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This paper exemplifies several methods for retrofitting existing housing through four case studies, representative of the historical centre of Enna, a small town in Sicily, according to the requirements of static safety, typological adaptation and indoor comfort. These buildings were mostly built in the nineteenth century, up to three floors based on load-bearing masonry, iron joists and hollow tile floors and wooden roofs. A typological and construction analysis of these buildings was carried out to identify the stratigraphy of the different technical elements. Static and energy audits had been previously undertaken to understand the gap between the current state of the buildings and Italian standards and to develop appropriate interventions taking into account the site characteristics and the energy and seismic risk class pre-and post-retrofit intervention. The analyses and the retrofit interventions were performed in compliance with Italian standards and laws and strove to reach the minimum level. The study supports the planning of structural and energy retrofit interventions designed for historic load-bearing masonry buildings. Finally, the study simulates a strategy of action to provide subsidies and tax relief related to effective seismic and/or energy improvement that could be relevant for owners/builders as well as for local authorities.

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Efficiency of strengthening techniques assessed for existing masonry buildings

Cited by 17 publications

References 14 publications

Optimal seismic retrofitting techniques for URM school buildings located in the southwestern Iberian peninsula

Optimal seismic retrofitting techniques for URM school buildings located in the southwestern Iberian peninsula

The Reticulatus method for shear strengthening of fair-faced masonry

Seismic and Energy Retrofit of the Historic Urban Fabric of Enna (Italy)

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