Analysis of Shear Capacity of Stirrup Corroded RC Beam Based on the Truss-Arch Theory

2012 ◽  
Vol 204-208 ◽  
pp. 2865-2873
Author(s):  
Ke Bo Zhang ◽  
Zhi Zhang ◽  
Jian Ren Zhang ◽  
Bin Liu
Keyword(s):  
Strength Criterion ◽  
Shear Capacity ◽  
Control Group ◽  
Rc Beam ◽  
Arch Model ◽  
Rc Beams ◽  
Diagonal Reinforcement ◽  
Steel Bars ◽  
Shear Bearing Capacity ◽  
Crucial Parameter

On the basis of truss-and-arch model and the concrete softening strength criterion under ultimate state, a formula for shear capacity of reinforced concrete (RC) beam with diagonal reinforcement was established and verified. Accordingly, six RC beams with diagonal reinforcement and corroded stirrup were tested along with control group, the tested results were analyzed by liner regression to modify the formula given. Hence a formula for inclined section shear capacity of stirrups corroded RC beam with diagonal reinforcement was proposed and compared with a preceding formula without a consideration of diagonal reinforcement in corroded RC beam .The results showed that the existence of diagonal reinforcing steel bars enhanced the behavior of vertical compression web member in truss institutions, therefore increasing the shear force shared by truss mechanism. The inclination of diagonal web member is a crucial parameter of truss model. As the stirrup corrosion aggravating, the shear bearing capacity of such RC beams does not decrease drastically.

Study on the Method for Calculating Shear Strength of RC Beams Strengthened with Externally Prestressed Wire Rope

2011 ◽  
Vol 94-96 ◽  
pp. 1442-1446
Author(s):  
Tian Lai Yu ◽  
Xin Yu Li ◽  
Qiang Ma ◽  
Zhen Jiang
Keyword(s):  
Test Data ◽  
Shear Failure ◽  
Wire Rope ◽  
Shear Capacity ◽  
Reinforced Concrete Beams ◽  
Arch Model ◽  
Rc Beams ◽  
Shear Span ◽  
Shear Bearing Capacity ◽  
Capacity Calculation

Through shear test data analysis of 13 RC beams Strengthened with externally prestressed wire rope, shear failure mechanism was elaborated, and shear bearing capacity of reinforced beams were not only calculated respectively by truss -arch model and other simplified calculation methods, but also were compared with test data. Based on the result of comparation, shear capacity calculation method of RC beam Strengthed with externally prestressed wire rope was discussed. The analysis results show that the mechanism of the wire rope shear externally prestressed reinforced concrete beams against the shear is similar with stirrups inside beam. When the shear span ratio is less than 2.7, the static average ratio of the truss-arch model shear capacity caculation value and tested value is 1.02, and standard deviation statistics is 0.07. In another word, calculation value agree with experimental value. When the shear span ratio is larger than 2.7, the calculation value is bigger than test.

scholarly journals Deterioration model of RC beams under marine atmospheric environment

2018 ◽  
Vol 199 ◽  
pp. 02012
Author(s):  
Hongyuan Guo ◽  
Guobing Li ◽  
Xianglin Gu
Keyword(s):  
Shear Capacity ◽  
Atmospheric Environment ◽  
Cycle Performance ◽  
Rc Beam ◽  
Rc Beams ◽  
Deterioration Model ◽  
Probability Density Evolution Method ◽  
Proposed Model ◽  
Corrosion Initiation Time ◽  
Mechanical Performances

This paper primarily proposes a deterioration model of reinforced concrete (RC) beams under marine atmospheric environment. Considering factors including corrosion initiation time, corrosion rate, corrosion non-uniformity and its effects on mechanical performances of steel bars, a comprehensive model was developed for the assessment of mechanical behaviour of RC beams under marine atmospheric environment. Also, to avoid the shortages brought by the classical truss theory, a modified compression field theory (MCFT) was applied to evaluate the effects of stirrups corrosion on the shear capacity of an RC beam. Then, according to a virtual case, the life-cycle performance of an RC beam was predicted through probability density evolution method (PDEM). Results approved the feasibility and effectiveness of the proposed model. Finally, further study work was pointed out.

scholarly journals Development of Shear Capacity Prediction Model for FRP-RC Beam without Web Reinforcement

2016 ◽  
Vol 2016 ◽  
pp. 1-19 ◽  
Author(s):  
Md. Arman Chowdhury ◽  
Zubayer Ibna Zahid ◽  
Md. Mashfiqul Islam
Keyword(s):  
Prediction Model ◽  
Shear Capacity ◽  
Rc Beam ◽  
Rc Beams ◽  
Large Database ◽  
Steel Reinforced Concrete ◽  
Shear Design ◽  
Proposed Model ◽  
Web Reinforcement ◽  
Capacity Prediction

Available codes and models generally use partially modified shear design equation, developed earlier for steel reinforced concrete, for predicting the shear capacity of FRP-RC members. Consequently, calculated shear capacity shows under- or overestimation. Furthermore, in most models some affecting parameters of shear strength are overlooked. In this study, a new and simplified shear capacity prediction model is proposed considering all the parameters. A large database containing 157 experimental results of FRP-RC beams without shear reinforcement is assembled from the published literature. A parametric study is then performed to verify the accuracy of the proposed model. Again, a comprehensive review of 9 codes and 12 available models is done, published back from 1997 to date for comparison with the proposed model. Hence, it is observed that the proposed equation shows overall optimized performance compared to all the codes and models within the range of used experimental dataset.

Experimental Study on Shear Capacity of RC Beams Strengthened with Carbon Fiber Reinforced Polymer Mandated by ACli 440

2016 ◽  
Vol 845 ◽  
pp. 154-157
Author(s):  
Sri Tudjono ◽  
Himawan Indarto ◽  
Monica Devi
Keyword(s):  
Experimental Study ◽  
Carbon Fiber ◽  
Shear Capacity ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Rc Beam ◽  
Rc Beams ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

Shear reinforcement for retrofitting an RC beam using unidirectional Carbon Fiber Reinforced Polymer (CFRP) woven can only be applied on the beam’s body below the concrete floor slab. Thus, it cannot fully curb like the way stirrups do, in which it will affect the shear capacity. The CFRP can only be ‘n’or ‘u’ shaped, taking into consideration the direction of shear force. Herein, the experimental study of the shear capacity ofshear capacity the beam strengthened by FRP is carried out.shear capacity The beams are RC beams of width 150 mm, height 300 mm, span of 1000 mm, f'c = 26 MPa having 2 bar of 19 mm diameter (fy = 403.65 MPa) and stirrups 6 mm diameter of 250 mm spacing (fy=375 MPa). The shear capacity measured is then compared with the shear capacity calculated using ACI 440. The result shows that the shear capacity measured from experiment is greater than the shear capacity calculated by ACI 440. Also, theshear capacity of RC beam with CFRP reinforcement n shape is greater than u shape.

scholarly journals Influence of Crack Width on Chloride Penetration in Concrete Subjected to Alternating Wetting–Drying Cycles

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3801
Author(s):  
Jun Lai ◽  
Jian Cai ◽  
Qing-Jun Chen ◽  
An He ◽  
Mu-Yang Wei
Keyword(s):  
Crack Width ◽  
Chloride Concentration ◽  
Rc Beam ◽  
Rc Beams ◽  
Cross Sectional ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Steel Bar ◽  
Steel Bars ◽  
Average Loss

To investigate the durability of reinforced concrete (RC) beams under the combined actions of transverse cracks and corrosion, corrosion tests were conducted on a total of eight RC beams with different water–cement ratios and cracking states. The effects of the transverse crack width, water–cement ratio, and the length of the wetting–drying cycle on the distribution of the free chloride concentration, the cross-sectional loss of the tensile steel bars, and the chloride diffusion coefficient are analyzed. The results show that the widths of the transverse crack and the water–cement ratio of concrete greatly affected the chloride profile and content of the RC beam specimens. Specifically, the chloride contents in all the cracked RC beams at the depth of the steel bar exceeded the threshold value of 0.15%. As the width of the cracks increased, the chloride concentration and penetration of the cracked concrete beam increased. However, the chloride concentration at the reinforcement position did not seem to be obviously affected by increasing the wetting–drying cycles from 182 days to 364 days. Moreover, the decrease of the water–cement ratio effectively inhibited the penetration of chloride ions in the RC beam specimens. In terms of the cross-sectional loss of the steel bars, the average loss of the steel bar increases with increasing crack width for the beams with 182-day cycles, while the effect of crack width on the average loss is not as noticeable for the beams with 364-day cycles. Finally, a model is proposed to predict the relationship between the crack width influence coefficient, μ, and the crack width, w, and this model shows good agreement with the experimental results.

Shear Capacity of RC Beams with Web Openings Strengthened with Multi Layers of CFRP

2014 ◽  
Vol 567 ◽  
pp. 494-498 ◽  
Author(s):  
Bashar S. Mohammed ◽  
Omar Alanni
Keyword(s):  
Reduction Factor ◽  
Shear Capacity ◽  
Fiber Reinforced Polymer ◽  
Rc Beam ◽  
Rc Beams ◽  
Web Openings ◽  
Web Opening ◽  
Reinforced Polymer ◽  
Eurocode 2 ◽  
Load Carrying

In some cases a cut-out web opening in a reinforced concrete (RC) beam is required to facilitate the passage of electrical and mechanical pipes and ducting from one side to another. The presence of cut-out web openings will lead to decreasing in the load carrying capacity of these RC beams. Therefore, strengthening the vicinity of these openings by using Carbon Fiber Reinforced Polymer (CFRP) will represent the best practical solution. In this study, thirteen RC beams with different sizes of cut-out web openings and with different layers of CFRP strengthening and also one solid RC beam (control) were prepared and tested to failure. The outcome of this experimental and analytical study showed that the modified Eurocode 2 model can reasonably be used in computing the shear forces of RC beams having the vicinity of their cut-out web openings strengthened with single/multi layers of CFRP. In addition, for safe design purposes, a reduction factor has been suggested as well.

Parameter Study and Shear Capacity of Plated RC Beams by Nonlinear Finite Element Method

2014 ◽  
Vol 1030-1032 ◽  
pp. 830-833
Author(s):  
Wen Shan Lin
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Numerical Experiments ◽  
Steel Plate ◽  
Shear Capacity ◽  
Nonlinear Finite Element ◽  
Parameter Study ◽  
Rc Beam ◽  
Rc Beams ◽  
Nonlinear Finite Element Method

In this study, the numerical experiments are performed to determine the shear capacity of RC beams strengthened by external steel plate. The numerical parameters include plate dimension, plate curtailment, and thickness of glue. According to numerical results, the shear capacity equation of plated RC beam was modified by regress of experimental data, and compared with result of finite element predicting.

Experimental Investigation on Shear Property of RC Beams with Aramid Fiber Mesh Stirrups

2011 ◽  
Vol 255-260 ◽  
pp. 20-24 ◽  
Author(s):  
Er Jun Wu ◽  
Jian Long Xing ◽  
Zhao Quan Zhu
Keyword(s):  
High Performance ◽  
Aramid Fiber ◽  
Rc Beam ◽  
Rc Beams ◽  
Rc Structures ◽  
High Durability ◽  
Shear Property ◽  
Shear Bearing Capacity ◽  
Fiber Mesh ◽  
Better Than

This paper develops a new-typed high-durability RC structures in which the steel stirrups are replaced by mesh stirrups weaved with soft high performance fiber belt. The experiments are carried out to investigate the shear property of six beams with soft aramid fiber mesh stirrups and one common RC beam and the results show that the failure state in the slope sections of the RC beams with fiber belt mesh stirrups is similar to the common RC beam. It was also found the shear property of beams with lean fiber mesh stirrups is better than that with vertical and horizontal mesh stirrups, and with the high-elastic- modulus fiber stirrups better than the low-elastic-modulus’s. In addition, the distributions of fiber stirrups strain at slope section are also observed. Based the experimental results, a model for beams with fiber mesh stirrups was established and the formula of shear bearing capacity was suggested.

The New Proposed Method to Evaluate the Shear Capacity of Tapered RC Beams without Stirrups

2016 ◽  
Vol 106 (6) ◽  
pp. 708-715
Author(s):  
Chenwei HOU ◽  
Takuro NAKAMURA ◽  
Takayuki IWANAGA ◽  
Junichiro NIWA
Keyword(s):  
Shear Capacity ◽  
Rc Beams

Experimental Response of RC Beams Strengthened in Shear by FRP Sheets

2013 ◽  
Vol 7 (1) ◽  
pp. 127-135 ◽  
Author(s):  
E. Grande ◽  
M. Imbimbo ◽  
A. Rasulo
Keyword(s):  
Slenderness Ratio ◽  
Shear Capacity ◽  
Rc Beams ◽  
Fiber Reinforced Plastic ◽  
Frp Composites ◽  
Reinforced Plastic ◽  
Externally Bonded ◽  
Experimental Response ◽  
Transverse Steel ◽  
Cracking Pattern

The paper discusses the results of an experimental investigation carried out on reinforced concrete (RC) beams strengthened in shear by externally bonded fiber reinforced plastic (FRP) sheets. The study is devoted to analyze the role that the transverse steel reinforcement and the beam slenderness ratio could play on the resistant mechanism of RC beams strengthened in shear by FRP composites. The results are summarized and analyzed in detail in the paper in terms of shear capacity, cracking pattern and shear resisting contribution of FRP.

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