Research on Experiments about Inverted Arch CFRP Reinforced RC Beam

2011 ◽  
Vol 230-232 ◽  
pp. 140-143 ◽  
Author(s):  
Yu Wang ◽  
Yin Liang ◽  
Fan Chun Liu ◽  
Lin Wang
Keyword(s):  
Bearing Capacity ◽  
Crack Width ◽  
Rc Beam ◽  
Reinforcement Effect ◽  
Flexural Performance ◽  
Good Economy

In this paper, we tested the two points loading flexural performance of inverted arch CFRP reinforced RC beam with practical experiments, and contrastively analyzed the limit bearing capacity, deflection under loading, strain, cracking load, crack width and spacing between directly bonded CFRP reinforced RC beam and inverted arch CFRP reinforced RC beam. Then we explored an RC beam strengthen method with good reinforcement effect and good economy and which can be easily applied in practical constructions.

scholarly journals Research on flexural performance of damaged RC beams strengthened by FPR plates

2021 ◽  
Vol 233 ◽  
pp. 03007
Author(s):  
Jiarui Liu ◽  
Xian Cui
Keyword(s):  
Bearing Capacity ◽  
Concrete Structure ◽  
Steel Plate ◽  
New Technology ◽  
Utilization Rate ◽  
Rc Beam ◽  
Fiber Reinforced ◽  
Reinforcement Effect ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite

Combining two technologies of pasting fiber reinforced composite board (FRP) and externally reinforced steel plate concrete structure, fiber-reinforced composite material and steel plate composite reinforced concrete structure technology can effectively improve the stress performance of concrete reinforced structure. To explore the effect of the new technology steel plate anchoring FRP slab concrete beams and the effect of different damage levels on the reinforcement effect, in this paper, the author made 3 FRP reinforced beams with damage rates of 20%, 40%, and 60%, 1 RC beam with FRP plate only and an ordinary RC beam to analyze the reinforcement effect of the new process steel plate anchored FRP plate and the bearing capacity and plastic performance of the reinforced beam with different damage rates. The results show that the new technology steel plate anchoring FRP plate reinforcement technology can effectively prevent the occurrence of early peeling failure, improve the ductility and bearing capacity of the reinforced beam, and significantly increase the utilization rate of the FRP plate; as the damage rate increases, the ultimate bearing capacity of the reinforced beam increases, but the ductility is significantly reduced.

Study on Flexural Performance of RC Beams Strengthened with Bonded Prestressed CFL

2014 ◽  
Vol 578-579 ◽  
pp. 1338-1342
Author(s):  
Jin Lin Huang ◽  
Pei Yan Huang ◽  
Jin Hui Xie
Keyword(s):  
Bearing Capacity ◽  
Experimental Research ◽  
Ultimate Load ◽  
Static Load ◽  
Rc Beam ◽  
Rc Beams ◽  
Load Bearing ◽  
Yield Load ◽  
Flexural Performance ◽  
Flexural Bearing Capacity

Based on experimental research and calculation theory of flexural bearing capacity, a method for calculating the ultimate load bearing of normal section member strengthened with prestressed CFL is proposed. Static load experimental results of two beams show that when prestress level is 20%, the cracking load and yield load of RC beams strengthened with prestressed CFL are 37.5% and 39.3% respectively. It is larger than that of RC beam strengthened with nonprestressed CFL.

A Study on Flexural Performance of RC Beam Strengthened with UHTCC for Improved Durability

2008 ◽  
Vol 400-402 ◽  
pp. 43-54
Author(s):  
Shi Lang Xu ◽  
Xiu Fang Zhang ◽  
Christopher K.Y. Leung
Keyword(s):  
Composite Beam ◽  
Crack Width ◽  
Tensile Strain ◽  
Experimental Results ◽  
Rc Beam ◽  
Rc Beams ◽  
Strain Capacity ◽  
Flexural Performance ◽  
High Toughness ◽  
Tensile Strain Capacity

Ultra-high toughness cementitious composite (UHTCC) exhibits the pseudo-hardening feature when subjected to tensile load and has high tensile strain capacity of normally up to 3%. Also, UHTCC has a unique cracking behavior. From cracking up to ultimate tensile strain capacity, the crack width in UHTCC could be still kept below 100m. This paper presents the utilization of UHTCC to replace a layer of concrete surrounding the main flexural reinforcement in ordinary RC beam to improve flexural performance especially beam durability as UHTCC displays high toughness and shows multiple fine cracks. Analytical closed-form formulae for flexural capacity, curvature and deformation of UHTCC/RC composite beam derived based on the elastic beam theory is presented first. Subsequently, experimental results of two groups of different reinforcement ratios of UHTCC/RC beams and control RC beams tested under flexural loading to verify the feasibility of analytical formulae as well as to examine the performance improvement of UHTCC/RC composite beam over the control beam is presented. Moment-curvature curves and load-mid span displacement curves for the tested beams are compared with the theoretical analysis. A good agreement between experimental and analytical results is found. The experimental results show that the use of a layer of UHTCC in RC beams can enhance both flexural capacity and ductility. The improvement is not significant with the increase in reinforcement ratio; however, the maximum crack width under service load even in the case of lightly reinforced beams can be limited within 0.1mm.

Experiment on Flexural Capacity of Damaged RC Beams Strengthened with Composite CFRP

2014 ◽  
Vol 501-504 ◽  
pp. 932-935
Author(s):  
Tao Luo
Keyword(s):  
Bearing Capacity ◽  
Ultimate Bearing Capacity ◽  
Experimental Results ◽  
Rc Beam ◽  
Rc Beams ◽  
Reinforcement Effect ◽  
Flexural Capacity ◽  
Loading Test ◽  
Research Results ◽  
Cfrp Sheets

In order to study the flexural capacity of the seismic damaged RC beams after reinforcement, the bearing capacity and ductility are comprehensively evaluated, which is based on the results of three points of division loading test on 8 models which are divided into 4 groups. Experimental results show that compared with the direct pasting CFRP, the ultimate bearing capacity of RC beam strengthened by composite CFRP sheets is much higher, the average is 20.7%. Cracking load and ductility are also improved higher. The reinforcement effect of CFRP sheets is used very well. The research results provide advice and reference for the next seismic damaged RC beams in the reinforcement engineering.

Flexural performance of reinforced concrete beam made with waste foundry sand as fine aggregate

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Manjunatha Mahadevappa ◽  
Rakshith Shri Guru Krupa ◽  
Shaik Kabeer Ahmed ◽  
Rakshith Kumar Shetty
Keyword(s):  
Flexural Strength ◽  
Crack Width ◽  
Crack Pattern ◽  
Rc Beam ◽  
Rc Beams ◽  
Content Type ◽  
Flexural Performance ◽  
Waste Foundry Sand ◽  
Natural Aggregates ◽  
Code Provisions

PurposeThe structural behavior of reinforced concrete (RC) beams made with waste foundry sand (WFS) was examined in this study by using investigational data. Five RC beams were tested in this present work, four beams with varying WFS content and one beam with natural aggregates. The factors considered for studying the flexural performance of RC beams were WFS content (10%, 20%, 30% and 40%), 15% Ground Granulated Blast Furnace Slag (GGBS) is used as supplementary cementitious (SCM) content for all beams and tension reinforcement ratio (0.95%). The crack pattern of the RC beams with WFS (RCB1, RCB2, RCB3 and RCB4) was similar to that of referral beam–RCB0. The RC beams made with WFS (RCB1, RCB2, RCB3 and RCB4) show lesser number of cracks than referral beam–RCB0. It is observed that RCB1 beam shows higher ultimate moment carrying capacity than other RC beams. A detailed assessment of the investigational results and calculations based on IS: 456-2000 code for flexural strength exhibited that the present provisions conservatively predicts the flexural strength and crack width of RC beams with WFS and 15% GGBS. It is suggested that 10% WFS can be used to make RC beam.Design/methodology/approachIn this present work, four RC beams made WFS and one RC beam made with natural aggregates. 15% GGBS is used as SCM for all RC beams. After casting of RC beams, the specimens were cured with wetted gunny bags for 28 days. After curing, RC beams like RCB0, RCB1, RCB2, RCB3 and RCB4 were tested under a four-point loading simply supported condition. An assessment of investigational results and calculations as per IS: 456-2000 code provisions has been made for flexural strength and crack width of RC beams with WFS and 15% GGBS. The crack pattern is also studied.FindingsFrom this experimental results, it is found that 10% WFS can be used for making RC beam. The RCB1 with 10% WFS shows better flexural performance than other RC beams. RC beams made with WFS show lesser number of cracks than referral beam–RCB0. IS: 456-2000 code provisions can be safely used to predict the moment capacity and crack width of RC beams with WFS and 15% GGBS.Originality/valueBy utilization of WFS, the dumping of waste and environmental pollution can be reduced. By experimental investigation, it is suggested that 10% WFS can be used to make RC structural members for low cost housing projects.

Strength Assessments of Concrete-Filled Steel Tubular Support of Soft Rock Roadway

2013 ◽  
Vol 838-841 ◽  
pp. 1884-1890 ◽  
Author(s):  
Guang Long Qu ◽  
Yan Fa Gao ◽  
Liu Yang ◽  
Bin Jing Xu ◽  
Guo Lei Liu ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Coal Mine ◽  
Soft Rock ◽  
Surrounding Rock ◽  
Flexural Performance ◽  
Laboratory Test Results ◽  
Different Types ◽  
Soft Rock Roadway ◽  
Core Concrete ◽  
Rock Roadway

Compared with I-shaped and U-shaped supports in soft rock roadway, concrete-filled steel tubular (CFST) support, as a new supporting form, has stronger bearing capacity with reasonable price. So it is becoming more and more popular in roadway supporting of coal mine in China. In this article, the surrounding rock in soft rock roadway was classified into three different types: hard rock in deep coal mine, soft surrounding rock, extremely soft surrounding rock. And, according to the characteristics of deformation failure of the CFST support and the surrounding rock in the industrial tests, three different strength assessments, including assessment of axial compressive strength, assessment of lateral flexural performance, assessment of hardening rate of core concrete, were proposed through mechanical analysis and laboratory tests for the three different types of the surrounding rock, respectively. Moreover, aimed to insufficient flexural strength of the support or low hardening rate of the core concrete in some of the roadway supporting, strengthening lateral flexural performance or making early strength concrete was necessary for the above unfavorable situations. The laboratory test results showed that the ultimate bearing capacity for the CFST support with φ194*8mm of steel tube reinforced by φ38mm round steel was 31% greater than that of the unreinforced one, 177% greater than that of the U-shaped one with equivalent weight per unit length.

Shear and flexural behaviour of lightweight self-consolidating concrete beams

2021 ◽  
Author(s):  
Kokilan Sathiyamoorthy
Keyword(s):  
Shear Strength ◽  
Crack Width ◽  
Concrete Beams ◽  
Shear Resistance ◽  
Normal Weight ◽  
Shear Behaviour ◽  
Flexural Behaviour ◽  
Self Consolidating Concrete ◽  
Shear Span ◽  
Flexural Performance

Shear and flexural behaviour of lightweight self-consolidating concrete (LWSCC) beams made of slag aggregates were investigated. Shear reinforced LWSCC beams showed similar shear behaviour compared to their non-shear reinforced counterparts until the formation of diagonal cracks but higher ultimate shear resistance and ductility. Compared to normal weight self-consolidating concrete (SCC) ones, non-shear reinforced LWSCC beams showed lower post-cracking shear resistance. Shear strength of LWSCC/SCC beams increased with the decrease of shear span to depth ratio. LWSCC beams showed higher number of cracks and wider crack width at failure than their SCC counterparts. LWSCC beams developed higher number of cracks with wider crack width at failure compared with their SCC counterparts. American, Canadian and British Codes were conservative in predicting shear strength of shear/non-shear reinforced LWSCC beams. LWSCC beams (with slag aggregate) showed good shear resistance compared with those made of other types of aggregates besides satisfactory flexural performance.

Theoretical Analysis of Reinforced Beams of UHTCC

2018 ◽  
Vol 878 ◽  
pp. 18-22
Author(s):  
Hua Qiang Yu
Keyword(s):  
Crack Width ◽  
Approximate Formula ◽  
Crack Spacing ◽  
Cementitious Composite ◽  
Reinforcement Effect ◽  
Ordinary Concrete ◽  
High Toughness ◽  
Reinforced Beams ◽  
New Type ◽  
Average Crack

UHTCC (Ultra High Toughness Cementitious Composite) is a new type of material which is widely used in this study. It is a kind of cement-based material with very good toughness. It is effective to improve the performance of damaged reinforced concrete and improve its durability. UHTCC is widely used in the reinforcement of concrete structures. There is no clear and effective method for calculating it. There is an approximate formula for the crack width of ordinary concrete. The concept of an average crack spacing is used in the derivation of the formula. The limit of UHTCC for cracks can be measured by the concept of average crack spacing. According to the obtained crack width limit, the reinforcement effect of UHTCC can be shown.

The Research on Strengthening Technique for Aged RC Beam

2011 ◽  
Vol 255-260 ◽  
pp. 70-73
Author(s):  
Bin Xie ◽  
Bin Jia ◽  
Ru Heng Wang
Keyword(s):  
Bond Strength ◽  
Bearing Capacity ◽  
Ultimate Bearing Capacity ◽  
Rc Beam ◽  
Strengthening Technique

The strengthening technique for the aged RC beam was introduced in this paper. A series of measures were utilized to increase the bond strength between CFRP and aged RC beam. The results of experiment indicate that ultimate bearing capacity of the strengthened RC beam increased almost 46%.

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