scholarly journals External Strengthening of Corrosion-Defected Beam–Column Members Using a CFRP Sheet

Fibers ◽  
2019 ◽  
Vol 7 (6) ◽  
pp. 53
Author(s):  
Nameer A. Alwash ◽  
Mohammed M. Kadhum ◽  
Ahmed M. Mahdi
Keyword(s):  
Axial Force ◽  
Carrying Capacity ◽  
Reinforced Concrete Beam ◽  
Transverse Load ◽  
Load Carrying Capacity ◽  
Significant Deterioration ◽  
Axial Forces ◽  
Load Carrying ◽  
External Strengthening ◽  
Cfrp Sheet

The efficiency of external strengthening using CFRP (Carbon Fiber Reinforced Polymer) sheets to rehabilitate corrosion-defected RC (Reinforced Concrete) beam–column members is experimentally studied. ALL specimens were tested under a combined axial force and transverse load until failure. The axial forces were applied with two levels either 25% or 50% of the ultimate design load of control specimen. The accelerated corrosion process was used to get steel reinforcement corrosion inside the concrete at three levels, 0% and approximately 5% and 20%, according to Faraday’s law. External strengthening with a CFRP sheet was used in this study to overcome the effect of deterioration in the mechanical properties of the corroded steel bars. A significant deterioration in the load carrying capacity, stiffness, and serviceability was recorded for corrosion-defected specimens. The increase of the axial force was recorded as a positive effect on the ultimate strength, stiffness, and serviceability of the testing specimens. This effect was clearly evident for the defected specimens, with an increasing corrosion level, by decreasing the adverse effects of corrosion. The external strengthening with a CFRP sheet restored the load-carrying capacity, stiffness, and serviceability to an undamaged state.

Relationship between Half-Cell Potentials and Load Carrying Capacity of Corroded Reinforced Concrete Beam-Column Joints

2013 ◽  
Vol 351-352 ◽  
pp. 939-944
Author(s):  
Ming Li ◽  
De Jian Shen ◽  
Jie Yang ◽  
Zheng Hua Cui
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Rate ◽  
Carrying Capacity ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Rc Beam ◽  
Load Carrying Capacity ◽  
Half Cell ◽  
Load Carrying ◽  
The Relationship

This paper aims at detailed investigation on the relationship between half-cell potentials and load carrying capacity of corroded RC beam-column joints. There are four specimens in the test with the corrosion rate to 0%, 3%, 9% and 15%. Results show that the potentials of normal joint are larger than that of corroded damaged joints. As the corrosion rate of joints increases, load carrying capacity and half-cell potentials decrease. Analytical method based on the values of half-cell potentials to evaluate the load carrying capacity of corroded joint is presented. Comparing the analytical and experimental results, the proposed method can predict the load carrying capacity of corroded reinforced concrete beam-column joints.

Load Carrying Capacity of Hybrid FRP-Concrete Composite Pile

2011 ◽  
Vol 250-253 ◽  
pp. 1165-1172 ◽  
Author(s):  
Joon Seok Park ◽  
Seong Sik Lee ◽  
Jeong Hun Nam ◽  
In Kyu Kang ◽  
Dong Jun An ◽  
...  
Keyword(s):  
Carrying Capacity ◽  
Filament Winding ◽  
Transverse Load ◽  
Load Carrying Capacity ◽  
Concrete Pile ◽  
Load Carrying ◽  
Theoretical Investigations ◽  
Composite Pile ◽  
New Type ◽  
Frp Tube

In the study, in order to enhance the durability and constructability of the pile foundation, hybrid FRP-concrete composite pile is developed and its applicability considering construction is discussed. Existing FRP-concrete composite pile is consisted of concrete pile and filament winding FRP wound outside of the pile. To improve the axial and transverse load carrying capacities longitudinal reinforcement is also needed additionally, and hence a new type hybrid FRP-concrete composite pile (HCFFT) is suggested. A new type HCFFT which is composed of pultruded FRP, filament winding FRP, and concrete filled inside of the FRP tube is proposed to improve compressive strength as well as flexural strength of the HCFFT pile. The load carrying capacity of proposed HCFFT pile is evaluated and discussed based on the result of experimental and theoretical investigations.

scholarly journals Transverse load carrying capacity of steel triangularly corrugated web beam with opening

2019 ◽  
Vol 279 ◽  
pp. 02004
Author(s):  
Sergey Kudryavtsev
Keyword(s):  
Carrying Capacity ◽  
Transverse Load ◽  
Steel Beams ◽  
Automatic Welding ◽  
Load Carrying Capacity ◽  
Element Analysis ◽  
Web Openings ◽  
Corrugated Webs ◽  
Load Carrying ◽  
Corrugated Web

The paper presents a study of the transverse bending behaviour of corrugated web beam with and without web openings. Examined steel beams consist of two flanges and a thin triangularly corrugated web, connected by automatic welding. In the literature, the influence of web opening over transverse load carrying capacity was dealt with mostly for steel beams with plane, sinusoidal and trapezoidal corrugated webs, so researches of beams with triangularly corrugated webs were found out to be very limited. A parametric study is carried out for various web slenderness and corrugation densities. A general-purpose finite element analysis software ABAQUS was used. The corrugation densities adopted in this study represent practical geometries, which are commonly used for such structures in building practice. Models with and without web openings were analysed and examined in terms of load-deformation characteristics and ultimate web shear resistance. Recommendations are given for the practical design of corrugated web beams weakened by circular openings.

Ultimate Load-Carrying Capacity of Pipe-Plate Vierendeel Truss Joints

2013 ◽  
Vol 838-841 ◽  
pp. 503-509
Author(s):  
Jie Luo ◽  
Jian Chun Xiao ◽  
Zhe Lu ◽  
Xiao Xiao Wei ◽  
Hong Xi Li ◽  
...  
Keyword(s):  
Axial Force ◽  
Carrying Capacity ◽  
Failure Modes ◽  
Ultimate Load ◽  
Plate Thickness ◽  
Load Carrying Capacity ◽  
Plate Height ◽  
Joint Failure ◽  
Load Carrying ◽  
Ultimate Load Carrying Capacity

To study the ultimate load-carrying capacity of pipe-plate Vierendeel truss joints, the analyses of joint failure modes and parameter effects were undertaken using nonlinear finite element method and uniform design approach. The plate instability was included in the failure modes. Factors such as the pipe diameter, the pipe thickness, the plate width, the plate height, and the plate thickness were considered in the joint models. Three kind of loading conditions on the plate, the axial force, the moment, the composed loading of axial force and moment were analyzed. The relationships between the joint failure modes and the factors are achieved. The joint ultimate load-bearing capacity formulas are proposed by regression analysis. The effects of factors on the joint strength are illustrated.

Development of cost-effective PL-3 concrete bridge barrier reinforced with sand-coated glass fibre reinforced polymer (GFRP) bars: static load tests

2014 ◽  
Vol 41 (4) ◽  
pp. 368-379 ◽  
Author(s):  
H. Khederzadeh ◽  
K. Sennah
Keyword(s):  
Carrying Capacity ◽  
Shear Failure ◽  
Ultimate Load ◽  
Cost Effective ◽  
Punching Shear ◽  
Transverse Load ◽  
Load Carrying Capacity ◽  
Gfrp Bars ◽  
Load Carrying ◽  
Ultimate Load Carrying Capacity

One of the main factors concerning durability and service life of steel-reinforced bridges is corrosion of steel bars especially when exposed to a harsh environment. The use of glass fibre reinforcing polymer (GFRP) bars as non-corrosive material has emerged as an innovative solution to corrosion related problems, reduce the maintenance cost, and increase the service life of bridge structures. A recent cost-effective design of PL-3 bridge barrier was developed at Ryerson University incorporating high-modulus GFRP bars with headed ends. This paper presents results of full-scale static tests to collapse performed on the developed PL-3 bridge barrier at interior and exterior locations to investigate the ultimate load carrying capacity to be compared with Canadian Highway Bridge Design Code (CHBDC). The experimental ultimate load carrying capacity of the barriers was observed to be far greater than CHBDC factored design transverse load. The failure pattern was initiated by a trapezoidal crack pattern at the front face of the barrier, followed by punching shear failure at the transverse load location. Based on the punching shear failure developed in the barrier wall and comparison with available punching shear equations in the literature, an empirical punching shear equation is proposed to determine the transverse load carrying capacity of PL-3 bridge barrier walls reinforced with GFRP bars.

Experimental Study on Debonding Load-Carrying Capacity of Cracked Concrete Strengthened with CFRP Sheet

2011 ◽  
Vol 71-78 ◽  
pp. 3312-3315
Author(s):  
Jian He Xie ◽  
Yong Chang Guo ◽  
Lin Jie Chen ◽  
Li Juan Li
Keyword(s):  
Bond Length ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Interface Shear ◽  
Cracked Concrete ◽  
Crack Location ◽  
Concrete Crack ◽  
Load Carrying ◽  
Cfrp Sheet ◽  
Debonding Load

This study conducts a series of experiments on cracked concrete strengthened with carbon fiber reinforce polymer (CFRP) sheet under three-point bending. The purpose is to investigate the effect of concrete crack on plate end debonding load-carrying capacity. 27 specimens were designed considering the pre-crack location, CFRP bond length and CFRP bond width. The results show that an abrupt change of the interface shear stress arises at the location of crack, and the debonding load-carrying capacity increases with the increase of CFRP bond length or CFRP bond width. However, when the concrete crack location is closer to CFRP end, the debonding load-carrying capacity is lower.

scholarly journals Strengthening of Reinforced Concrete Beam Elements by Wrapping with Gfrp

2018 ◽  
Vol 7 (3.34) ◽  
pp. 30
Author(s):  
Dr Tamil Selvi ◽  
Dr P.B. Sakthivel ◽  
R PoornimaGandhi
Keyword(s):  
Carrying Capacity ◽  
Load Capacity ◽  
Reinforced Concrete Beam ◽  
Load Carrying Capacity ◽  
Conventional Concrete ◽  
Existing Structures ◽  
Beam Elements ◽  
Glass Fibre Reinforced Polymer ◽  
Study Results ◽  
Load Carrying

Structural elements need to strengthening and retrofitting works as a result of ageing, upgrading of structure due to new design codes or any Environmental issues. The strengthening or retrofitting of existing structures are done externally to the structural members using various techniques such as jacketing, retrofitting, guniting and shotcreting, and ferrocement techniques. The experiment is carried out to increase the load carrying capacity of structure by wrapping externally the beam elements with Glass Fibre Reinforced Polymer mats (GFRP) is wrapped around the beam elements. The load carrying capacity is analysed using single and double layer wraps on damaged and undamaged specimens and compare with conventional beam as control specimens. Beam specimens of size 750 mm x 150 mm x 150 mm with M30 Grade concrete used in the experiment. The result of flexural strength and load – deflection of test and control beam have brought out with energy absorption coefficient. The study results have demonstrated that the performance of 1 layer GFRP wrapped beams show an increased load carrying capacity of 1.86 times of that of conventional beam, and 2 layer  GFRP wrapped beam show an increase  in load capacity of 2.6 times of that of conventional concrete.  

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