scholarly journals Fibre-reinforced polymer stirrup for reinforcing concrete structures

2020 ◽  
Vol 3 (1) ◽  
pp. 17-24
Author(s):  
Marco Lindner ◽  
Konrad Vanselow ◽  
Sandra Gelbrich ◽  
Lothar Kroll
Keyword(s):  
Fibre Composite ◽  
Precast Concrete ◽  
Load Carrying Capacity ◽  
Lightweight Construction ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Fibre Reinforced Polymer ◽  
International Testing ◽  
Concrete Elements ◽  
Interesting Alternative

Fibre-plastic composites offer an interesting alternative to concrete reinforcement. In order to expandthe application spectrum of reinforcing elements in fibre composite construction, a new steel-free bracingsystem with reduced radii of curvature was developed. An improvement in load carrying capacity couldbe proven in extensive investigations based on international testing methods and verified by practicaltests. With the help of newly reinforced precast concrete elements from the area of waterways and trafficroutes, a high potential for lightweight construction and resource efficiency can be impressivelydemonstrated.

BEHAVIOUR OF SQUARE CONCRETE COLUMN CONFINED WITH GFRP COMPOSITE WARP/KOMPOZITINIAIS STIKLO PLUOŠTU ARMUOTO POLIMERO LAKŠTAIS SUSTIPRINTŲ KVADRATINIŲ BETONINIŲ KOLONŲ ELGSENA

2008 ◽  
Vol 14 (2) ◽  
pp. 115-120 ◽  
Author(s):  
Riad Benzaid ◽  
Nasr-Eddine Chikh ◽  
Habib Mesbah
Keyword(s):  
Fibre Composite ◽  
Confined Concrete ◽  
Concrete Column ◽  
Load Carrying Capacity ◽  
Reinforced Polymer ◽  
Composite Layers ◽  
Gfrp Composite ◽  
Load Carrying ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Composite

The behaviour of fibre reinforced polymer (FRP)‐confined concrete in circular columns has been extensively studied, but much less is known about concrete in FRP‐confined square columns, in which the concrete is non‐uniformly confined and the effectiveness of confinement is much reduced. The present paper deals with the analysis of experimental results in terms of load‐carrying capacity and strains, obtained from tests on square prismatic concrete column, strengthened with external glass fibre composite. The parameters considered are the number of composite layers and the corner radius for a square shape. A total of twenty‐one prisms of size 100 × 100 × 300 mm were tested under strain control rate of loading. Santrauka Pluoštu armuotu polimeru sustiprintų apskritų betoninių kolonų elgsena yra išsamiai išnagrinėta. Daug mažiau žinoma apie polimero pluoštu sustiprintų kvadratinių betoninių kolonų elgseną. Tokiuose elementuose betono deformacijos suvaržomos nevienodai. Dėl to mažėja sustiprinimo efektyvumas. Straipsnyje pateikiami išoriniais stiklo pluošto lakštais sustiprintų kvadratinių betoninių kolonų laikomosios galios, deformacijų eksperimentinių tyrimų rezultatai ir jų analizė. Eksperimentiniuose tyrimuose nagrinėta kompozitinių pluoštų sluoksnių skaičiaus, skerspjūvio kampo spindulio įtaka sustiprintų kolonų elgsenai. Iš viso išbandytos dvidešimt viena 100×100× 300 mm matmenų prizmės. Bandymai atlikti kontroliuojant apkrovimo greitį pagal deformacijas.

scholarly journals Studies on stress-strain behaviour of concrete mixes confined with BFRP rebars

2021 ◽  
Vol 309 ◽  
pp. 01049
Author(s):  
K Ajay Kumar ◽  
A Venkat Sai Krishna ◽  
S Shrihari ◽  
V Srinivasa Reddy
Keyword(s):  
Ultimate Load ◽  
Load Carrying Capacity ◽  
Basalt Fibre ◽  
Stress Strain ◽  
Reinforced Polymer ◽  
Strain Behaviour ◽  
Load Carrying ◽  
Fibre Reinforced Polymer ◽  
Ultimate Load Carrying Capacity ◽  
Steel Rebars

In the present study, the stress-stain behaviour of confined concrete made with basalt fibre reinforced polymer bars (BFRP) were taken up. The stress-strain behaviour was studied for the concrete mixes confined with steel rebars and BFRP rebars. The confinement was given in the form of steel hoops in the cylinders, 3 hoops (0.8%), 4 hoops (1.1%), 5 hoops (1.3%) and 6 hoops (1.6%). The addition of basalt fibres along with confinement of concrete with steel and BFRP hoops enhanced the compressive strength, indicating further confinement effect in the concrete. It is observed that the addition of fibres is helpful in lower confinements only. Beyond 1.1% confinement, the addition of any type of basalt fibres doesn’t show any effect on compressive strengths. From the stress-strain behaviour of all types of concrete mixes, it is concluded that the ultimate load-carrying capacity and strains at peak stresses are more in concrete with BFRP hoops for mixes up to 1.1% confinement. The addition of basalt fibres to concrete has increased the ductility in both confined and unconfined states

Behaviour of geopolymer concrete-filled pultruded GFRP short columns

2019 ◽  
Vol 53 (18) ◽  
pp. 2555-2567 ◽  
Author(s):  
Weena Lokuge ◽  
Rajab Abousnina ◽  
Nilupa Herath
Keyword(s):  
Glass Fibre ◽  
Geopolymer Concrete ◽  
Load Carrying Capacity ◽  
Reinforced Polymer ◽  
Glass Fibre Reinforced Polymer ◽  
Load Carrying ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced ◽  
Polymer Tube ◽  
Polymer Tubes

This research paper presents the results of an experimental investigation on the axial compressive behaviour of 24 geopolymer concrete-filled glass fibre-reinforced polymer tubes. The test variables considered are the compressive strength of geopolymer concrete (30 MPa and 35 MPa) and the shape of the cross section (square, circular and rectangular). All the glass fibre-reinforced polymer tubes had the same amount of fibres and similar fibre orientation together with the same aspect ratio. The failure of the square and rectangular columns initiated with the splitting of the corners and resulted in a lower load-carrying capacity compared to the circular columns whose failure was initiated by the crushing of glass fibre-reinforced polymer tube followed by the separation of glass fibre-reinforced polymer tube into strips. It can be concluded that axial load-carrying capacity of square and rectangular sections can be improved by a concrete filler with higher compressive strength. Adopted finite element analysis to simulate the behaviour of the columns is capable of predicting the stress–strain behaviour and the mode of failure.

Investigation on the Behaviour of Fibre Reinforced Polymer Wrapped Concrete In-Filled Steel Tube Columns

2016 ◽  
Vol 857 ◽  
pp. 136-141
Author(s):  
P. Gajalakshmi ◽  
S. Aravind ◽  
P. Soundarapandian
Keyword(s):  
Finite Element ◽  
Carrying Capacity ◽  
Analytical Study ◽  
Steel Tube ◽  
Absorption Capacity ◽  
Load Carrying Capacity ◽  
Energy Absorption Capacity ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Fibre Reinforced Polymer

Concrete in-filled steel tube (CIFST) columns are mainly used as structural members in buildings located in seismic zones. CIFST columns prone to buckling and technique is required to control the buckling of concrete filled steel tubes when they are subjected to cycles of loading. In this work, CIFST columns wrapped with fibre reinforced polymer laminates (FRPL) to prevent the local buckling. Experimental and analytical study of CIFST columns externally wrapped with FRPL have been conducted. Theoretical study is also conducted to find the ultimate load carrying capacity of CIFST columns. The parameters involved in this investigation are type of fibre and shape of the steel tube. The CIFST columns are tested under lateral loading to determine the number of cycles to failure and energy absorption capacity and to observe the hysteresis behaviour. The analytical study comprises of finite element modeling of CIFST columns wrapped with FRPL. The results obtained from the experimental investigation and finite element model are compared. The results revealed that FRPL wrapped circular CIFST columns have higher load carrying capacity and energy absorption capacity and exhibit ductile behavior when compared to CIFST columns.

Repair of steel structures by bonded carbon fibre reinforced polymer patching: experimental and numerical study of carbon fibre reinforced polymer – steel double-lap joints under tensile loading

2007 ◽  
Vol 34 (12) ◽  
pp. 1542-1553 ◽  
Author(s):  
Angus C.C. Lam ◽  
J.J. Roger Cheng ◽  
Michael C.H. Yam ◽  
Gaylene D. Kennedy
Keyword(s):  
Carbon Fibre ◽  
Lap Joints ◽  
Load Carrying Capacity ◽  
Test Results ◽  
Lap Joint ◽  
Element Analysis ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer

The behavior of carbon fibre reinforced polymer (CFRP) composite bonded to a steel plate double-lap joint was investigated experimentally. A total of 19 specimens were tested with the major test parameters being the bonded lap length, LL, and the axial adherend stiffness ratio, ETR. Five of the 19 specimens were prepared using CFRP sheets, and the rest using CFRP plates. Two CFRP plate specimens were prepared with a tapered lap joint, and their results were compared with those of counterpart specimens prepared without tapered lap joints. In general, the behavior of specimens made from either CFRP sheets or CFRP plates were similar. The joint's axial load carrying capacity increased with increasing LL up to a certain limit, when the joint's load carrying capacity could no longer be increased by increasing LL. However, experimental results showed that a larger failure deformation could be achieved by increasing LL past this limit. Specimens that had the same inner adherend thickness but higher axial adherend stiffness ratios showed higher axial load carrying capacities. Test results also showed that the strengths of tapered lap joints were almost the same as those of nontapered lap joints with the same LL. Nonlinear finite element analysis was carried out to study the stress–strain behavior of the adherend and the adhesive of the double-lap joint. Using finite element analysis results in an analytical solution obtained from the literature, predictions of the joint's maximum axial strength and minimum required LL were made. This analytical solution provided good predictions when compared with test results, producing test to predicted ratios from 0.88 to 1.14.

Experimental study on the axial compression performance of GFRP-reinforced concrete square columns

2018 ◽  
Vol 22 (7) ◽  
pp. 1554-1565 ◽  
Author(s):  
Jianwei Tu ◽  
Kui Gao ◽  
Lang He ◽  
Xinping Li
Keyword(s):  
Carrying Capacity ◽  
Ultimate Load ◽  
Fiber Reinforced Polymer ◽  
Load Carrying Capacity ◽  
Longitudinal Reinforcement ◽  
Rc Columns ◽  
Compression Performance ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Ultimate Load Carrying Capacity

At present, extensive studies have been conducted relative to the topic of fiber-reinforced polymer(FRP)- reinforced concrete (RC) flexural members, and many design methods have also been introduced. There have, however, been few studies conducted on the topic of FRP-RC compression members. In light of this, eight glass-fiber-reinforced polymer (GFRP)-RC square columns (200×200×600 mm) were tested in order to investigate their axial compression performance. These columns were reinforced with GFRP longitudinal reinforcement and confined GFRP stirrup. These experiments investigated the effects of the longitudinal reinforcement ratio, stirrup configuration (spirals versus hoops) and spacing on the load-carrying capacity and failure modes of GFRP-RC rectangular columns. The test results indicate that the load-carrying capacity of longitudinal GFRP bars accounted for 3%-7% of the ultimate load-carrying capacity of the columns. The ultimate load-carrying capacity of RC columns confined with GFRP spirals increased by 0.8%-1.6% with higher ductility, compared to GFRP hoops. Reducing the stirrup spacing may prevent the buckling failure of the longitudinal bars and increase the ductility and load-carrying capacity of the GFRP-RC columns. It has been found that setting the GFRP compressive strength to 35% of the GFRP maximum tensile strength yields a reasonable estimate of ultimate load-carrying capacity of GFRP-RC columns.

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