Unified strength model based on the Hoek-Brown failure criterion for fibre-reinforced polymer-confined pre-damaged concrete columns with circular and square cross sections

2020 ◽  
Author(s):  
Yang Zhang ◽  
Zhi-fang Lu ◽  
Yu-gui Cao
Keyword(s):  
Cross Sections ◽  
Failure Criterion ◽  
Concrete Columns ◽  
Strength Model ◽  
Model Based ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer

scholarly journals Experimental Work to Study the Strengthening Effect of SFR and CFRP on a Part or Whole of the Length of Slender RC Columns

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohammed Al-Helfi ◽  
Ali Allami
Keyword(s):  
Cross Sections ◽  
Ultimate Load ◽  
Steel Fibre ◽  
Concrete Columns ◽  
Effective Length ◽  
Strengthening Effect ◽  
Interaction Diagram ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer

Abstract The This paper is focusses on the investigation of the strengthened column by steel-fibre-reinforced (SFR) and carbon fibre-reinforced polymer (CFRP) on a part or a whole of the length of the column under axial force, and to obtain the effective length, which is responsible for the increasing of the ability of the column to resist buckling. Seven samples were designed as slender reinforced columns with dimensions of 2000 mm length and cross-sections of 120 mm x 60 mm. It was shown that the strengthening of the middle half of the column length by SFR gave an ultimate load similar to the strengthening of the whole column with same material. Also, it was found that the column strengthened by SFR increased its ultimate load by 42.6 %, 42.1 % and 33.3 % for strengthened lengths of dimensions L, L/2 and L/3, respectively, compared to the non-strengthened column. The increase in ultimate load that could be borne by the column strengthened by CFRP were 53.0 % and 33.8 % for strengthened lengths of L and L/2, respectively, only. Interaction diagram had been depended as a theoretical analysis for slender concrete columns. The interaction diagram for the column strengthened by CFRP is greater than for the column strengthened by SFR, which in turn is greater than the non-strengthened column.

scholarly journals Numerical parametric studies on the fire endurance of fibre-reinforced-polymer-confined concrete columns

2004 ◽  
Vol 31 (6) ◽  
pp. 1090-1100 ◽  
Author(s):  
L A Bisby ◽  
V KR Kodur ◽  
M F Green
Keyword(s):  
Reinforced Concrete ◽  
Holistic Approach ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
Reinforced Polymer ◽  
Fire Endurance ◽  
Fibre Reinforced Polymer ◽  
Parametric Studies ◽  
Parking Garages ◽  
Promising Application

Confinement of reinforced concrete columns by circumferential fibre reinforced polymer (FRP) wraps is a promising application of FRP materials for structural strengthening and seismic upgrading of deteriorated or under-strength members. However, if this technique is to be used in buildings, parking garages, and industrial structures, then the ability of FRP materials and FRP-wrapped columns to withstand the effects of fire must be demonstrated and evaluated. This paper presents the results of parametric studies conducted using a previously presented and partially validated numerical fire simulation model to investigate the effects of a number of parameters on the fire behaviour of FRP-wrapped reinforced concrete columns. It is demonstrated that appropriately designed and adequately protected FRP-wrapped reinforced concrete columns are capable of achieving fire endurances equivalent to conventionally reinforced concrete columns. Furthermore, this study also suggests that a holistic approach to the fire design of FRP-wrapped members is required, rather than an approach based on the specific performance of the FRP materials. Design recommendations for the fire-safe design of FRP-wrapped concrete columns are presented and discussed.Key words: reinforced concrete, rehabilitation, strengthening, fibre reinforced polymer, fire endurance, fire insulation, numerical modelling.

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