Passive and SMA-activated confinement of circular masonry columns with basalt and glass fibers composites

Micelli, Francesco; Angiuli, Riccardo; Corvaglia, Paolo; Aiello, Maria Antonietta

doi:10.1016/j.compositesb.2014.06.034

Cited by 47 publications

(21 citation statements)

References 17 publications

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“…Actually, the slope of the initial branch approximately coincides with the modulus of elasticity of the undamaged stone. This initial branch extends now beyond the ultimate compressive strength of the unconfined stone (about 30 to 35 MPa), as has been observed in other published research with stone materials [ 18 , 21 , 23 ]. From this point, core cracking occurs, and transverse expansion of the rock becomes much more pronounced; this deformation is limited by the effect of the jacketing, which is rapidly activated.…”

Section: Resultssupporting

confidence: 69%

“…In the case of specimens with a greater radius of curvature at the edges and with two layers of reinforcement, the ultimate strength was doubled, with large increases in the ultimate strain. Micelli et al [ 21 ] presented a similar investigation to [ 18 ], in which they also incorporated hybrid solutions made of glass fiber fabrics combined with shape memory alloys (SMA), in order to evaluate the capacity of these materials to provide active confinements. Witzany and Zigler [ 22 ] worked with larger square cross-section columns made of perfectly cut sandstone pieces or in the form of irregular blocks and continuous or discontinuous CFRP reinforcements.…”

Section: Introductionmentioning

confidence: 99%

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FRP Confinement of Stone Samples after Real Fire Exposure

et al. 2020

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The mechanical properties of stone materials can be severely affected by exposure to high temperatures. The effect of fire on stone buildings could cause irreversible damage and make it necessary to retrofit the affected elements. Particularly, the strengthening of columns by confinement with composites has been widely improved during the last decades. Today, fiber reinforced polymer (FRP) confinement represents a very interesting alternative to traditional steel solutions. This work studied the behavior of cylindrical stone specimens subjected to real fire action and confined by means of CFRP or GFRP jackets, with the aim of assessing the effectiveness of these reinforcement systems applied to a material that has previously been seriously damaged by high temperature exposure. In general, the strengthened samples showed notable increases in strength and ductility. The response seemed to depend basically on the FRP properties and not on the degree of damage that the stone core may have suffered. Finally, the results obtained experimentally were compared with the confinement models proposed by the available design guides, in order to evaluate the accuracy that these models can offer under the different situations addressed in this research.

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Section: Resultssupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

FRP Confinement of Stone Samples after Real Fire Exposure

et al. 2020

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“…The shape memory effect of SMA (Shape Memory Alloy) materials seems to be an innovative suitable solution for the active strengthening of masonry structures [26]. In fact, it is possible to use SMA materials together with FRP wrapping, which provides a passive strengthening, to activate confinement in masonry columns [27]. Nevertheless, being an improvement of FRP applications, this technique inherits from FRPs the peculiarity of being a technique for local strengthening.…”

Section: State Of the Art On Retrofitting Techniques For Masonry Smentioning

confidence: 99%

Some of the Latest Active Strengthening Techniques for Masonry Buildings: A Critical Analysis

Ferretti

Pascale

2019

Materials

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The present paper deals with the retrofitting of unreinforced masonry (URM) buildings, subjected to in-plane shear and out of-plane loading when struck by an earthquake. After an introductive comparison between some of the latest punctual and continuous active retrofitting methods, the authors focused on the two most effective active continuous techniques, the CAM (Active Confinement of Masonry) system and the Φ system, which also improve the box-type behavior of buildings. These two retrofitting systems allow increasing both the static and dynamic load-bearing capacity of masonry buildings. Nevertheless, information on how they actually modify the stress field in static conditions is lacking and sometimes questionable in the literature. Therefore, the authors performed a static analysis in the plane of Mohr/Coulomb, with the dual intent to clarify which of the two is preferable under static conditions and whether the models currently used to design the retrofitting systems are fully adequate.

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“…Among all the available reinforcement techniques for masonry buildings, active reinforcement is gaining an increasing attention from designers (Angiuli et al, 2011;Micelli et al, 2014;Zuboski, 2013) as, contrarily to passive reinforcement, it acts on structural elements from the moment of its installation, without requiring that a structural damage occurs to start working.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Active Confinement Techniques with Steel Ribbons: Masonry Buildings

Ferretti¹

2018

European Journal of Engineering and Formal Sciences

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In the present paper, we analyzed the main advantages of the active confinement techniques with a particular focus on the CAM system, which is an Italian reinforcement technique with pre-tensioned stainless steel ribbons. Italian seismic codes classify the CAM system as belonging to the strengthening category of “horizontal and vertical ties”. Therefore, we compared the CAM system to the reinforcement techniques with horizontal and vertical ties in order to understand the actual similarities and possible differences between them. Moreover, we offered a deep analysis of the main critical issues of the CAM system, distinguishing between geometrical and mechanical weak-points. In particular, we analyzed the strengthening mechanism of the CAM system, still poorly understood, by performing a static analysis in the Mohr/Coulomb plane. Finally, we provided suggestions for future developments.

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Passive and SMA-activated confinement of circular masonry columns with basalt and glass fibers composites

Cited by 47 publications

References 17 publications

FRP Confinement of Stone Samples after Real Fire Exposure

FRP Confinement of Stone Samples after Real Fire Exposure

Some of the Latest Active Strengthening Techniques for Masonry Buildings: A Critical Analysis

Effectiveness of Active Confinement Techniques with Steel Ribbons: Masonry Buildings

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