scholarly journals Numerical Analysis on Flexural Behaviors of Prestressed Reinforced Concrete Beams Strengthened with NSM CFRP Strips

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Jia Yang ◽  
Xiao Liu ◽  
Wei Li
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Ultimate Load ◽  
Concrete Strength ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymers ◽  
Near Surface ◽  
Strength Grade ◽  
Finite Element Software

This paper presents the numerical analysis of prestressed reinforced concrete (PRC) beams strengthened with near-surface mounted (NSM) carbon fiber reinforced polymers (CFRP). ABAQUS finite element software was used to simulate the existing test beams to investigate the flexural behaviors of PRC beams strengthened with NSM CFRP strips. The finite element model of beams strengthened with NSM CFRP strips was established. The finite element calculation results were compared with the experimental results to verify the accuracy and effectiveness of the model. Based on this model, the influences of concrete strength grade and amount of CFRP strips on the flexural behaviors of directly strengthened beams and the cycle numbers and overload amplitude on the flexural behaviors of damaged strengthened beam were further analyzed, and the load-carrying capacity calculation formula of PRC beam strengthened with NSM CFRP strips was established. The results showed that the simulation results and the theoretical calculation were consistent with the test results. With the increase of concrete strength grade and amount of CFRP strips, the ultimate load of directly strengthened beams increased significantly, with a maximum increase of 21.3% and 23.0%, respectively. When the concrete strength grade exceeded C50, the improvement of the ultimate load was limited. When the overload amplitude was less than 60% of the ultimate load, the cycle numbers (within 500 times) had little effect on the yield load, ultimate load, and deformation. When the overload amplitude was higher than 60% of the ultimate load, the deformation increased, and the ultimate load decreased with the increase of the cycle numbers. The larger the overload amplitude, the smaller the ultimate load, and the larger the deformation under the same cycle numbers.

Finite Element Analysis of Shear Strength of Reinforced Concrete Beams after Fire

2013 ◽  
Vol 671-674 ◽  
pp. 474-478 ◽  
Author(s):  
Kai Xiang ◽  
Guo Hui Wang ◽  
Bi Zhao
Keyword(s):  
Finite Element ◽  
Shear Strength ◽  
Reinforced Concrete ◽  
Exposure Time ◽  
Concrete Strength ◽  
Reinforced Concrete Beams ◽  
Rc Beams ◽  
Fire Exposure ◽  
Shear Span ◽  
Strength And Stiffness

Shear strength and stiffness of fire-damaged reinforced concrete (RC) beams were researched. The nonlinear finite element method (FEM) was developed to simulate shear strength of fire-damaged RC beams. Considering mechanical properties deterioration of concrete and steel reinforcing bar, the parameters of fire-damaged RC beams, including fire exposure time, shear span to depth ratios, concrete strength, diameters of stirrups and spacing of stirrups, were analyzed. Based on numerical analysis, the change of shear strength and stiffness of fire-damaged RC beams were identified. The results showed that shear strength and stiffness of fire-damaged RC beams changed under different parameters. With increase of fire exposure time or increase of shear span to depth ratio or decrease of concrete strength, shear strength and stiffness of fire-damaged RC beams descended obviously. With decrease of diameters of stirrups or increase of spacing of stirrups, shear strength of fire-damaged RC beams descended gradually, but stiffness of fire-damaged RC beams had little change.

scholarly journals Finite Element Analysis on Reinforced Concrete Beams Strengthened with CFRP

2022 ◽  
Vol 2148 (1) ◽  
pp. 012034
Author(s):  
Yihong Hong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Reinforced Concrete Structure ◽  
Analysis Model ◽  
Test Beam ◽  
Element Analysis ◽  
Finite Element Software

Abstract Reinforced concrete structure is widely used in building structure because of its unique physical and mechanic properties, but with the increase of service life, there will be different degrees of damage in the structures. In this paper, combined with the test beam, a model of reinforced concrete beam strengthened with CFRP is established by Using ANSYS finite element software, nonlinear finite element analysis is carried out on the whole process of yield, cracking and destruction of the test beam under secondary load, while different working states of CFRP sheets were simulated by the life and death unit. The results show that the bending performance of reinforced concrete (RC) beams strengthened with CFRP can be predicted by selecting the finite element analysis model rationally.

scholarly journals Finite element analysis of reinforced concrete beams with openings in the abdomen and strengthened with steel sleeves based on ANSYS

2020 ◽  
Vol 198 ◽  
pp. 01029
Author(s):  
Yaohui Shen ◽  
Longbin Lin ◽  
Zhengwei Feng
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Circular Hole ◽  
Reinforced Concrete Beam ◽  
Steel Tube ◽  
Reinforced Concrete Beams ◽  
Element Analysis ◽  
Finite Element Software ◽  
Steel Sleeve

The finite element software ANSYS is used to calculate the ultimate bearing capacity of ordinary beam and circular hole beam, and the results are compared with the test values made by predecessors. The value of shear transfer coefficient between cracks of reinforced concrete beam with circular hole in the abdomen in ANSYS finite element simulation is summarized. The coefficient is used to simulate the circular hole beam strengthened by steel sleeve, and it is pointed out that the steel tube is used to reinforce the circular hole beam The effect of tube reinforcement on the bearing capacity of circular hole beam is not obvious.

Numerical Analysis on Steel Reinforced Concrete Beam-Concrete Filled Steel Tubular Column under Cyclic Loading

2012 ◽  
Vol 588-589 ◽  
pp. 203-207
Author(s):  
Chi Yun Zhao ◽  
Hua Li ◽  
Li Yun Li
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Concrete Beam ◽  
Element Model ◽  
Simulation Method ◽  
Reinforced Concrete Beam ◽  
Steel Reinforced Concrete ◽  
Finite Element Software ◽  
Composite Joint

The nonlinear behavior of the full scale test of the composite joint between steel reinforced concrete beam and concrete filled steel tubular column under low cyclic reversed loading are simulated by using finite element software ANSYS. A separated model was used, element concrete solid 65, element shell 181 and element link 8 were used to model concrete material, steel members and steel bars respectively. The numerical analysis results are compared with the data of the experimental research. The advantages and shortcoming of the finite element model are given. A better numerical simulation method and a use for reference to the similar case are expected to be afforded.

scholarly journals A Parametric Study on the Flexural Strengthening of Reinforced Concrete Beams with Near Surface Mounted FRP Bars

2018 ◽  
Vol 4 (8) ◽  
pp. 1917
Author(s):  
Minu Panahi ◽  
Mohsen Izadinia
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Weight Ratio ◽  
Bending Moment ◽  
Reinforced Concrete Beams ◽  
Flexural Behavior ◽  
Experimental Investigations ◽  
Near Surface ◽  
Finite Element Software ◽  
Near Surface Mounted

FRP rods as lightweight materials with extraordinary properties of high strength to weight ratio, corrosion resistance, potentially high overall durability, tailor ability and high specific attributes are one of the most favorable materials to strengthen existing reinforced structures. The present study aimed to identify the behavior of reinforced concrete flexural beams strengthened with fiber reinforced polymer (FRP) rods through near surface mounted method (NSM). The results of the current study were based on nonlinear finite element software ABAQUS which can accurately simulate the experimental investigations on flexural behavior of reinforced concrete beams strengthened with NSM FRP rods. Validation of the proposed model was confirmed first by making a comparison with the experimental study presented in the literature. A parametric analysis was conducted on validated specimens to investigate the effect of FRP rod diameters, rod arrangements, FRP materials, as well as rods groove intervals on flexural behavior of strengthened reinforced beams. The numerical results of mid-span bending moment deflection, ultimate bending moment, failure deflection and ductility index were reported. For the sake of simplicity to be used by engineers, the results of the current study were drawn in the form of design charts and tables.

scholarly journals Numerical Investigation of the Behavior of Reinforced Concrete Beam Reinforced with FRP Bars

2019 ◽  
Vol 5 (11) ◽  
pp. 2296-2308 ◽  
Author(s):  
Rania Salih Mohammed ◽  
Zhou Fangyuan
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Load Capacity ◽  
Reinforced Concrete Beam ◽  
Prediction Equation ◽  
Reinforced Concrete Beams ◽  
Finite Element Software ◽  
Concrete Damage ◽  
Frp Bars

In this study, the behavior of reinforced concrete beams reinforced with FRP bars was investigated. A total of seventeen models were carried out based on the finite element software (ABAQUS). The concrete damage plasticity modeling was considered. Two types of fiber polymer bars, CFRP and GFRP as longitudinal reinforcement for concrete beam were used. The validation of numerical results was confirmed by experimental results, then the parametric study was conducted to evaluate the effect of change in different parameters, such as (diameter size, number of bars), type of FRP bars, longitudinal arrangement for FRP bars. All results were analyzed and discussed through, load-deflection diagram, according, to the difference parameter considered. The results showed that the use of FRP bars in rebar concrete beam improves the beam stiffness and enhance the cracking load. The load capacity enhanced in the range of (7.88-64.82%) when used CFRP bars. The load-carrying capacity of beams strengthened with CFRP is higher than that of strengthened with GFRP. Furthermore, the use of FRP bars in bottom and steel in top reinforcement is useful to overcome the large deflection, and improving the beam ductility. Finally, the results of finite element models were compared with the prediction equation, according to ACI440.1R-15.

Strain Mode Damage Detection in Reinforced Concrete Beams Application

2012 ◽  
Vol 446-449 ◽  
pp. 566-571
Author(s):  
Jia Quan Wu ◽  
Ji Yao ◽  
Hong Yan Li ◽  
Liang Cao ◽  
Kun Ma
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Damage Detection ◽  
Structural Damage ◽  
Concrete Beams ◽  
Element Model ◽  
Reinforced Concrete Beams ◽  
Strain Mode ◽  
Finite Element Software ◽  
Injury Models

This paper describes the strain mode damage detection theory and a three-dimensional reinforced concrete beams finite element model was built by finite element software. The different degree injury models tests were compared. Experiment’s results show that the first four natural frequencies of different degree injury models are small differences while the corresponding strain modes have a significant changed in damage location. The structure of the strain mode changes are still evident when structural damage occurred in the strain mode node.

Ultimate Bearing Capacity Research on the Steel Tube Composite Column Filled with Steel Reinforced Concrete

2010 ◽  
Vol 163-167 ◽  
pp. 2106-2111
Author(s):  
Shan Shan Sun ◽  
Jun Hai Zhao ◽  
Xue Ying Wei ◽  
Hai Bing Xiao
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Concrete Strength ◽  
Three Dimensional ◽  
Steel Tube ◽  
Reduction Factor ◽  
Element Analysis ◽  
Composite Column ◽  
Steel Reinforced Concrete ◽  
Finite Element Software

The ultimate load-bearing capacities of axially-loaded steel tube composite column filled with steel reinforced concrete under three-dimensional stress based on the unified strength theory are analyzed in this paper. The influence of thickness-length ratio and scale effect are considered by introducing the reduction factor of equivalent constraints and concrete strength reduction factor, respectively. The nonlinear three-dimensional finite element analysis of the steel tube composite column filled with steel reinforced concrete is performed by the finite element software ANSYS. The numerical and the analytical results are compared with experimental results and good agreement can be observed. A series of numerical simulation technologies is studied and described in detail, such as selecting element type, defining material model of steel and concrete, establishing global finite element model with discrete reinforced bars elements, applying loads to the specimens, and setting solution controls option. The results indicate that ANSYS finite element software may well simulate the behavior of the steel tube composite column filled with steel reinforced concrete under axial compression through reasonably selecting parameters.

scholarly journals Simplified Irregular Beam Analysis and Design

2019 ◽  
Vol 5 (7) ◽  
pp. 1577-1589
Author(s):  
Mohammed Salem Al-Ansari ◽  
Muhammad Shekaib Afzal
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Structural Safety ◽  
Simple Method ◽  
Analysis And Design ◽  
Shaped Beam ◽  
Finite Element Software ◽  
Strength Design ◽  
Simplified Method

This paper presents simple method to estimate the strength design of reinforced concrete beam sections based on structural safety and reliability. Irregular beam shaped sections are commonly used nowadays in the construction industry. This study reveals the simplified method to analyze and design the different irregular shaped beam sections. In this study, the selected irregular beam shaped sections are divided mainly into three groups, beams with straight edges, beams with sloped edges and circular beams. Each group contains the most commonly used beam shaped sections in that category. Six beams sections (B-1 to B-6) are selected for group-1 whereas five beam sections (B-7 to B-11) and a circular beam section (B-12) are chosen for group 2 and 3 respectively. Flexural beam formulas for three groups of reinforced concrete beams are derived based on section geometry and ACI building code of design. This study also analyzed numerical examples for some of the sections in each group category using the proposed simplified method to determine the strength design of the irregular beams. The results obtained using simplified method for all of the three groups are compared with the finite element software (SAP v2000). The percentage difference of simplified method with the finite element software ranges within 5% to 10%. This makes the simplified method for irregular shaped beam sections quite promising.

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