Deformable polyurethane joints and fibre grids for resilient seismic performance of reinforced concrete frames with orthoblock brick infills

Theodoros Rousakis; Alper Ilki; Arkadiusz Kwiecien; Alberto Viskovic; Matija Gams; Petra Triller; Bahman Ghiassi; Andrea Benedetti; Zoran Rakicevic; Camilla Colla; Omer Faruk Halici; Bogusław Zając; Łukasz Hojdys; Piotr Krajewski; Fabio Rizzo; Vachan Vanian; Anastasios Sapalidis; Efthimia Papadouli; Aleksandra Bogdanovic

doi:10.3390/polym12122869

Deformable polyurethane joints and fibre grids for resilient seismic performance of reinforced concrete frames with orthoblock brick infills

Theodoros Rousakis^*, Alper Ilki, Arkadiusz Kwiecien, Alberto Viskovic, Matija Gams, Petra Triller, Bahman Ghiassi, Andrea Benedetti, Zoran Rakicevic, Camilla Colla, Omer Faruk Halici, Bogusław Zając, Łukasz Hojdys, Piotr Krajewski, Fabio Rizzo, Vachan Vanian, Anastasios Sapalidis, Efthimia Papadouli, Aleksandra Bogdanovic

^*Corresponding author for this work

Department of Civil Engineering

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

The behaviour of reinforced concrete frames with masonry wall infills is influenced a lot by the stiffness and strength difference between the frame and the infill, causing early detrimental damage to the infill or to the critical concrete columns. The paper reports the results from shake table seismic tests on a full-scale reinforced concrete (RC) frame building with modified hollow clay block (orthoblock brick) infill walls, within INMASPOL SERA Horizon 2020 project. The building received innovative resilient protection using Polyurethane Flexible Joints (PUFJs) made of polyurethane resin (PU), applied at the frame-infill interface in different schemes. Further, PUs were used for bonding of glass fibre grids to the weak masonry substrate to form Fibre Reinforced Polyurethanes (FRPUs) as an emergency repair intervention. The test results showed enhancement in the in-plane and out-of-plane infill performance under seismic excitations. The results confirmed remarkable delay of significant infill damages at very high RC frame inter-story drifts as a consequence of the use of PUFJs. Further, the PUFJ protection enabled the resilient repair of the infill even after very high inter-story drift of the structure up to 3.7%. The applied glass FRPU system efficiently protected the damaged infills against collapse under out-of-plane excitation while they restored large part of their in-plane stiffness.

Original language	English
Article number	2869
Pages (from-to)	1-20
Number of pages	20
Journal	Polymers
Volume	12
Issue number	12
DOIs	https://doi.org/10.3390/polym12122869
Publication status	Published - Dec 2020

Bibliographical note

Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.

Funding

Funding: This research activity was undertaken within the framework of the project Seismology and Earthquake Engineering Research Infrastructure Alliance for Europe—SERA, infills and masonry structures protected by deformable polyurethanes in seismic areas (INMASPOL). The project leading to this application has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 730900.

Funders	Funder number
Horizon 2020 Framework Programme	730900

Keywords

Brick infill
Flexible joint
Polyurethane
RC column
Resilience
Shake table

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10.3390/polym12122869

Cite this

Rousakis, T., Ilki, A., Kwiecien, A., Viskovic, A., Gams, M., Triller, P., Ghiassi, B., Benedetti, A., Rakicevic, Z., Colla, C., Halici, O. F., Zając, B., Hojdys, Ł., Krajewski, P., Rizzo, F., Vanian, V., Sapalidis, A., Papadouli, E., & Bogdanovic, A. (2020). Deformable polyurethane joints and fibre grids for resilient seismic performance of reinforced concrete frames with orthoblock brick infills. Polymers, 12(12), 1-20. Article 2869. https://doi.org/10.3390/polym12122869

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title = "Deformable polyurethane joints and fibre grids for resilient seismic performance of reinforced concrete frames with orthoblock brick infills",

abstract = "The behaviour of reinforced concrete frames with masonry wall infills is influenced a lot by the stiffness and strength difference between the frame and the infill, causing early detrimental damage to the infill or to the critical concrete columns. The paper reports the results from shake table seismic tests on a full-scale reinforced concrete (RC) frame building with modified hollow clay block (orthoblock brick) infill walls, within INMASPOL SERA Horizon 2020 project. The building received innovative resilient protection using Polyurethane Flexible Joints (PUFJs) made of polyurethane resin (PU), applied at the frame-infill interface in different schemes. Further, PUs were used for bonding of glass fibre grids to the weak masonry substrate to form Fibre Reinforced Polyurethanes (FRPUs) as an emergency repair intervention. The test results showed enhancement in the in-plane and out-of-plane infill performance under seismic excitations. The results confirmed remarkable delay of significant infill damages at very high RC frame inter-story drifts as a consequence of the use of PUFJs. Further, the PUFJ protection enabled the resilient repair of the infill even after very high inter-story drift of the structure up to 3.7%. The applied glass FRPU system efficiently protected the damaged infills against collapse under out-of-plane excitation while they restored large part of their in-plane stiffness.",

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author = "Theodoros Rousakis and Alper Ilki and Arkadiusz Kwiecien and Alberto Viskovic and Matija Gams and Petra Triller and Bahman Ghiassi and Andrea Benedetti and Zoran Rakicevic and Camilla Colla and Halici, {Omer Faruk} and Bogus{\l}aw Zaj{\c a}c and {\L}ukasz Hojdys and Piotr Krajewski and Fabio Rizzo and Vachan Vanian and Anastasios Sapalidis and Efthimia Papadouli and Aleksandra Bogdanovic",

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year = "2020",

month = dec,

doi = "10.3390/polym12122869",

language = "English",

volume = "12",

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Rousakis, T, Ilki, A, Kwiecien, A, Viskovic, A, Gams, M, Triller, P, Ghiassi, B, Benedetti, A, Rakicevic, Z, Colla, C, Halici, OF, Zając, B, Hojdys, Ł, Krajewski, P, Rizzo, F, Vanian, V, Sapalidis, A, Papadouli, E & Bogdanovic, A 2020, 'Deformable polyurethane joints and fibre grids for resilient seismic performance of reinforced concrete frames with orthoblock brick infills', Polymers, vol. 12, no. 12, 2869, pp. 1-20. https://doi.org/10.3390/polym12122869

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T1 - Deformable polyurethane joints and fibre grids for resilient seismic performance of reinforced concrete frames with orthoblock brick infills

AU - Rousakis, Theodoros

AU - Ilki, Alper

AU - Kwiecien, Arkadiusz

AU - Viskovic, Alberto

AU - Gams, Matija

AU - Triller, Petra

AU - Ghiassi, Bahman

AU - Benedetti, Andrea

AU - Rakicevic, Zoran

AU - Colla, Camilla

AU - Halici, Omer Faruk

AU - Zając, Bogusław

AU - Hojdys, Łukasz

AU - Krajewski, Piotr

AU - Rizzo, Fabio

AU - Vanian, Vachan

AU - Sapalidis, Anastasios

AU - Papadouli, Efthimia

AU - Bogdanovic, Aleksandra

PY - 2020/12

Y1 - 2020/12

N2 - The behaviour of reinforced concrete frames with masonry wall infills is influenced a lot by the stiffness and strength difference between the frame and the infill, causing early detrimental damage to the infill or to the critical concrete columns. The paper reports the results from shake table seismic tests on a full-scale reinforced concrete (RC) frame building with modified hollow clay block (orthoblock brick) infill walls, within INMASPOL SERA Horizon 2020 project. The building received innovative resilient protection using Polyurethane Flexible Joints (PUFJs) made of polyurethane resin (PU), applied at the frame-infill interface in different schemes. Further, PUs were used for bonding of glass fibre grids to the weak masonry substrate to form Fibre Reinforced Polyurethanes (FRPUs) as an emergency repair intervention. The test results showed enhancement in the in-plane and out-of-plane infill performance under seismic excitations. The results confirmed remarkable delay of significant infill damages at very high RC frame inter-story drifts as a consequence of the use of PUFJs. Further, the PUFJ protection enabled the resilient repair of the infill even after very high inter-story drift of the structure up to 3.7%. The applied glass FRPU system efficiently protected the damaged infills against collapse under out-of-plane excitation while they restored large part of their in-plane stiffness.

AB - The behaviour of reinforced concrete frames with masonry wall infills is influenced a lot by the stiffness and strength difference between the frame and the infill, causing early detrimental damage to the infill or to the critical concrete columns. The paper reports the results from shake table seismic tests on a full-scale reinforced concrete (RC) frame building with modified hollow clay block (orthoblock brick) infill walls, within INMASPOL SERA Horizon 2020 project. The building received innovative resilient protection using Polyurethane Flexible Joints (PUFJs) made of polyurethane resin (PU), applied at the frame-infill interface in different schemes. Further, PUs were used for bonding of glass fibre grids to the weak masonry substrate to form Fibre Reinforced Polyurethanes (FRPUs) as an emergency repair intervention. The test results showed enhancement in the in-plane and out-of-plane infill performance under seismic excitations. The results confirmed remarkable delay of significant infill damages at very high RC frame inter-story drifts as a consequence of the use of PUFJs. Further, the PUFJ protection enabled the resilient repair of the infill even after very high inter-story drift of the structure up to 3.7%. The applied glass FRPU system efficiently protected the damaged infills against collapse under out-of-plane excitation while they restored large part of their in-plane stiffness.

KW - Brick infill

KW - Flexible joint

KW - Polyurethane

KW - RC column

KW - Resilience

KW - Shake table

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Deformable polyurethane joints and fibre grids for resilient seismic performance of reinforced concrete frames with orthoblock brick infills

Abstract

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Keywords

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