Experimental and Theoretical Investigation on Flexural Behavior of Corroded Steel Beams Strengthened by CFRP Plate

Seven simply supported steel beams were tested to explain the effect of strengthening by external prestressing strands. All of the beams have the same steel section, clear span length and the strengthening samples which implemented by two external prestressing strands. The tested beams are divided into two categories according to existing of external prestressing strands, the first category consists of one steel beam as a reference, while, the second group deals with steel beams strengthening by external prestressing strands and consists of six steel beams divided according to the eccentricity location of prestressing strand with jacking stress (815 MPa). From experimental results, it was found that the moment curvature curves behavior for the tested beams are stiffer and with less ductility than the reference beams and the ultimate moment capacity is increased with increasing the eccentricity location. While, the maximum radius of curvature at bottom flange decreases with increasing the eccentricity location as compare with the reference beam.

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Flexure Performance of Externally Bonded CFRP Plates-Strengthened Reinforced Concrete Members

Mathematical Problems in Engineering ◽

10.1155/2020/2604024 ◽

2020 ◽

Vol 2020 ◽

pp. 1-15

Author(s):

Xin Yuan ◽

Chaoyu Zhu ◽

Wei Zheng ◽

Jiangbei Hu ◽

Baijian Tang

Keyword(s):

Failure Modes ◽

Calculation Model ◽

Flexural Behavior ◽

Test Results ◽

Flexural Test ◽

Concrete Members ◽

Cfrp Plate ◽

Matlab Program ◽

Externally Bonded ◽

The Relationship

This paper investigates the flexural behavior of CFRP plate-strengthened concrete structures. Specimens of the CFRP plate-reinforced beam were designed and tested by the four-point flexural test. The load-deflection relationship, failure modes, and crack propagation were analyzed. The results showed that the postcracking stiffness and bearing capacity of the test beams can be improved by the additional anchoring measures for CFRP strengthening. The relationship between flexural moment and curvature was analyzed by introducing a MATLAB program. The calculation model between curvature, flexural moment, and stiffness was derived for the CFRP plate-strengthened structure. The recommended calculation model was applied in the analysis of deflection, and the theoretical values were compared with the test results.

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Flexural behavior of steel beams strengthened by carbon fiber reinforced polymer plates – Three dimensional finite element simulation

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2009.09.010 ◽

2010 ◽

Vol 31 (3) ◽

pp. 1317-1324 ◽

Cited By ~ 18

Author(s):

M.H. Seleem ◽

I.A. Sharaky ◽

H.E.M. Sallam

Keyword(s):

Finite Element ◽

Three Dimensional ◽

Fiber Reinforced Polymer ◽

Flexural Behavior ◽

Carbon Fiber Reinforced Polymer ◽

Steel Beams ◽

Reinforced Polymer ◽

Element Simulation ◽

Dimensional Finite Element ◽

Three Dimensional Finite Element

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Effect of CFRP Plate Length on Flexural Behavior of GFRP Reinforced Concrete Beam Strengthening

Advanced Science Letters ◽

10.1166/asl.2018.11522 ◽

2018 ◽

Vol 24 (6) ◽

pp. 3968-3973

Author(s):

Norhafizah Salleh ◽

Abdul Rahman Mohd Sam ◽

Jamalludin Mohd Yatim ◽

Nur Hafizah A Khalid ◽

Noor Azlina Abdul Hamid ◽

...

Keyword(s):

Reinforced Concrete ◽

Concrete Beam ◽

Reinforced Concrete Beam ◽

Flexural Behavior ◽

Plate Length ◽

Cfrp Plate ◽

Beam Strengthening

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Experiment Research of Flexural Behavior of Reinforced RC Beams Strengthened with the External Prestressed CFRP Plates

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.466-467.225 ◽

2012 ◽

Vol 466-467 ◽

pp. 225-228

Author(s):

Kan Kang ◽

Peng Zhang ◽

Feng Tao Liu

Keyword(s):

Flexural Behavior ◽

Utilization Rate ◽

Rc Beams ◽

Test Results ◽

Experiment Research ◽

Flexural Performance ◽

Cfrp Plate ◽

Reinforced Beams ◽

Bending Capacity ◽

Prestressed Anchor

Based on the the self-developed prestressed CFRP plate anchorage,the test specimens comprised 5 RC beams strengthened with the way the external prestressed CFRP plates,the research on the different prestressed tension and different span beam about the influence of the bending capacity , ultimate bearing capacity,cross section strain, CFRP strain and deflection of the test reinforced beams on the research. The test results showed that: the externally prestressed CFRP plate can obviously increase of the flexural performance of RC beams, and improve the utilization rate of the strength of the CFRP plate, through the external prestressed anchor of CFRP plate for a tension, reducing the RC beams crack, and improving the ductility of the RC beams.

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Failure Modes of CFRP Flexural Strengthened Steel I-Beams

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.471-472.590 ◽

2011 ◽

Vol 471-472 ◽

pp. 590-595 ◽

Cited By ~ 3

Author(s):

Kambiz Narmashiri ◽

Mohd Zamin Jumaat ◽

Nor Hafizah Ramli Sulong

Keyword(s):

Failure Modes ◽

Steel Structures ◽

Fiber Reinforced Polymer ◽

Bending Test ◽

Steel Beams ◽

Numerical Studies ◽

Reinforced Polymer ◽

Cfrp Plate ◽

Critical Regions ◽

Incremental Loading

This paper presents the experimental and numerical studies on the flexural strengthened steel I-beams by using Carbon Fiber Reinforced Polymer (CFRP) strips. Nowadays, strengthening existing steel structures by using CFRP has been widely interested. One of the common usages of CFRP to strengthen steel beams is the flexural upgrading. In this case, CFRP strips are pasted on the tensile flange to improve flexural behaviors. The problems that are frequently reported for CFRP strengthened steel beams are the debonding, delaminating (peeling), and splitting. Identification these failure modes are essential to provide an appropriate level of safety for strengthened steel beams. To investigate the CFRP failure modes, four strengthened steel I-beams were chosen. The CFRP plates with different thicknesses in single and double (splice) layers were used. Both experimental test (four-points bending test) and numerical simulation (full 3D simulation with ANSYS) were employed. The incremental loading was applied until failure while deformations in the critical regions were recorded. The results reveal that for the CFRP flexural strengthened steel beams the following failure modes occurred: (a) debonding at the CFRP plate tips, (b) debonding below point loads, (c) delaminating at the ends of CFRP plate, and (d) splitting below point loads. The sequence of failure modes depended on the specifications of CFRP plate. Some recommendations are provided to overcome/retard these failures.

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