Seismic Rehabilitation of Beam-Column Joints Using FRP Laminates

Ghobarah, A.; Said, Aly

doi:10.1080/13632460109350388

Cited by 97 publications

(53 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Düğüm bölgesinin kesme dayanımını artırmak amacıyla kompozit lifler düğüm bölgesine değişik şekilde sarılmıştır. Denenen iyileştirme teknikleri, düğümün kesme dayanımını artırmada ve kesme göçmesi modunu geciktirmede başarılı olmuştur [11]. Gülkan çalışmasında onarılmış betonarme kolon-kiriş birleşimlerinin elastik olmayan sonuçlarını araştırmıştır.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Betonarme Zayif Kolon-Ki̇ri̇ş Bi̇rleşi̇mleri̇ni̇n Davranişi

Er¹,

Aykaç²,

Can³

2014

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

View full text Add to dashboard Cite

ÖZETBu çalışmada düğüm bölgesi etriyesiz, kolon etriyeleri eksik olan betonarme kolon-kiriş birleşimlerinin deprem yüklerini benzeştiren yükler altındaki davranışı deneysel olarak incelenmiştir. Çalışmada kenar kolon-kiriş birleşimleri ele alınmış tersinir tekrarlanır yükler altında test edilmiştir. Çalışma, bu çalışmanın devamı olan, yedi adet düğüm güçlendirme yöntemini içeren çalışmanın ön çalışması niteliğindedir. ½ ölçekli 1 tanesi referans, yedi tanesi düğüm bölgesi etriyesiz eleman olmak üzere toplam sekiz adet deney elemanı hazırlanmış ve test edilmiştir. Elemanlar hazırlanırken gerçek yapıdaki yapım kusurları aynen oluşturulmaya çalışılmıştır. Bu yapım kusurları; düğüm bölgesinde eksik bırakılan etriyeler, düşük beton dayanımı ve zamanla dökülen kabuk betonunu kapsamaktadır. Zayıf düğüm elemanlarının davranışları referans elemanıyla karşılaştırılmış, yük-sehim grafikleri elde edilmiştir. Kolondaki sabit eksenel yük ve kolon üzerinde düğüme yakın bölgede, kolonda eksik bırakılan etriye aralıkları ana parametre olarak ele alınmıştır. Yapılan deneysel çalışma sonucunda referans eleman eğilme taşıma gücüne kirişten ulaşılmıştır. Zayıf elemanların tamamında ise kiriş taşıma gücünden çok önce birleşim bölgesinde taşıma gücüne ulaşılmıştır. Birleşim bölgesinde hasar oluşumu tehlikelidir. Bazı zayıf elemanlarda taşıma gücünü hem kolonlardaki kesme hasarları, hem de düğümdeki ağır birleşim hasarları (düğüm bölgesindeki betonun tamamen ezilip dökülmesi gibi) birlikte belirlemiştir. Anahtar kelimeler: Betonarme birleşim, Zayıf düğüm, Düğüm mekanizması BEHAVIOUR OF REINFORCED CONCRETE WEAK COLUMN-BEAM CONNECTIONS ABSTRACTIn this study the behavior of RC weak column-beam connections which have no joint stirrups and lack of column stirrups, are investigated experimentally under earthquake loads. Edge beam to column joints were tested under reversed cyclic loads. It is the prestudy of which has seven joint strengthening techniques. ½ scaled one reference and seven weak joint specimens with no stirrups were prepared and tested. The building defects in real structure exactly tried to create when producing the weak specimens. These building defects include lacking stirrups in joint region, low compressive strength of concrete and in progress of time pouring out of concrete cover. The weak specimens' behaviors compared with the reference specimen and load-deflection graphics taken. The main parameters are constant axial load and the distance of lacking stirrups at the joint region. As a result of the experimental study in reference specimen achieved to carrying capacity from the beam. Damages in joints are dangerous. In all weak specimens reached to carrying capacity from the joint before the beam. In some weak specimens columns' shear damages and joints' hard damages together determined the carrying capacity.

show abstract

Section: Gi̇ri̇ş (Introduction)unclassified

Betonarme Zayif Kolon-Ki̇ri̇ş Bi̇rleşi̇mleri̇ni̇n Davranişi

Er¹,

Aykaç²,

Can³

2014

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

View full text Add to dashboard Cite

show abstract

“…The whole section is assumed in the elastic range, hence it is possible to assess the neutral axis, c, by considering the static moment of the cracked section equal to zero (see Equation (11)). Compression force S 1 is evaluated according to Equation (12) where neutral axis, c, is equal to 47 mm. In this way, equating the bond demand to the bond capacity previously evaluated in the three bond conditions, it is possible to evaluate the column shears V c8 , V c9 and V c10 , respectively, as reported in Table 5 for the relevant simulation case.…”

Section: Appendixmentioning

confidence: 99%

“…Several FRP-strengthening materials and layouts were considered to define the benefits provided to the seismic performance of beam-column joints (e.g., Gergely et al [8], Pantelides et al [9], Gergely et al [10], Granata and Parvin [11], Ghobarah and Said [12], Pantelides et al [13] among others).…”

Section: Introductionmentioning

confidence: 99%

Simplified Model for Strengthening Design of Beam–Column Internal Joints in Reinforced Concrete Frames

et al. 2015

View full text Add to dashboard Cite

The beam-column joints are very restricted areas in which the internal forces, generated by boundary elements, act on the concrete core and reinforcing bars with a very high gradient. They are the link between horizontal and vertical structural elements, and therefore, they are directly involved in the transfer of seismic forces. Thus, they are crucial to study the seismic behavior of reinforced concrete (RC) structures. To fully understand the seismic performances and failure modes of beam-column joints in RC buildings, a simplified analytical model of joint behavior is proposed and theoretical simulations are performed. The aim of the model, focusing on internal perimetric joints, is to identify the strength hierarchy in terms of capacity for different failure modes (namely failure of cracked joint, bond failure of passing through bars, flexural/shear failures of columns or beams). It could represent a tool for the designers of new joints to quantify the performance of new structures, but also as a tool for the designers of external strengthening of existing joints in order to calculate the benefits of the retrofit and pushing the initial failure to a more desirable failure mode. Further, some experimental results of tests available in the scientific literature are reported, analyzed and compared.Polymers 2015, 7 1733

show abstract

“…connections referring to the joint region including the beam/s and column/s framing into the joint). Both exterior and interior connections have been tested with externally bonded FRP to enhance the connection shear capacity [1][2][3][4] or to enhance the anchorage capacity of poorly anchored longitudinal beam reinforcement. 5,6 In addition, FRP has been used to enhance both the shear strength of the connection and anchorage of the beam reinforcement 7,8 and also to relocate the formation of plastic hinging further along the beam away from the joint.…”

Section: Introductionmentioning

confidence: 99%

Strengthening RC beam–column connections with FRP strips

Shrestha

Smith²,

Samali

2009

Proceedings of the Institution of Civil Engineers - Structures

View full text Add to dashboard Cite

Reinforced concrete connections, designed prior to the implementation of earthquake design standards, may be vulnerable to shear failure during a seismic attack. Addition of externally bonded fibre-reinforced polymer (FRP) composites can enhance not just the shear capacity but the deformation and energy absorption capacity of the connection. The majority of research studies to date have opted for complete or near-complete coverage of the joint region with FRP and have subjected the test specimens to cyclic (push–pull) loading. Such strengthening schemes and method of loading make it quite difficult to accurately monitor and hence understand the behaviour of the FRP and the concrete beneath. This paper presents results of a series of tests on the strengthening of shear deficient connections with FRP strips subjected to either cyclic or monotonic loading with the primary motivation being accurate description of the behaviour of the FRP. The tests also enable the failure modes to be more accurately reported and classified especially due to the use of monotonic loading. An analytical model is finally presented which accurately describes the mechanics of the FRP strengthening with the model predictions correlating reasonably well with the test data.

show abstract

Seismic Rehabilitation of Beam-Column Joints Using FRP Laminates

Cited by 97 publications

References 3 publications

Betonarme Zayif Kolon-Ki̇ri̇ş Bi̇rleşi̇mleri̇ni̇n Davranişi

Betonarme Zayif Kolon-Ki̇ri̇ş Bi̇rleşi̇mleri̇ni̇n Davranişi

Simplified Model for Strengthening Design of Beam–Column Internal Joints in Reinforced Concrete Frames

Strengthening RC beam–column connections with FRP strips

Contact Info

Product

Resources

About