scholarly journals Flexural Performance of Laced Reinforced Concrete Beams under Static and Fatigue Loads

2019 ◽  
Vol 25 (10) ◽  
pp. 134-153
Author(s):  
Haifaa Dhamad Hasan ◽  
Abbas AbdulMajeed Allawi
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Fatigue Loading ◽  
Reinforced Concrete Beams ◽  
Vertical Shear ◽  
Control Technique ◽  
Steel Ratio ◽  
Comparison Results ◽  
Fatigue Loads ◽  
Bar Diameter

This paper introduces experimental results of eighteen simply supported reinforced concrete beams of cross sections ( ) and length 3000 mm to study the effect of lacing reinforcement on the performance of such beams under static and fatigue loads. Twelve reinforced concrete beams (two of them are casted with vertical shear reinforcement used as control beams) are tested under four points bending loading with displacement control technique and six laced reinforced concrete beams were exposed to high frequency (10 Hz) by fixing the fatigue load in each cycle. Three parameters are used in the designed beams, which are: lacing bar diameter (4mm, 6mm, and 8mm), lacing bar inclination angle to horizontal , and lacing steel ratio depending on number of lacing bar in each longitudinal face of beam and lacing bar diameter. The comparison results of experimental tests revealed that the ultimate loads of laced reinforced concrete beams are higher than the conventional reinforced concrete beams due to increasing lacing bar diameter, angle of inclination lacing bar, and lacing steel ratio, while the deflection is reduced. Also, the laced reinforced concrete beams can safely withstand the fatigue loading.

Degradation Mechanism of Reinforced Concrete Beam Subjected to Fatigue Loads and Seawater Erosion

2015 ◽  
Vol 744-746 ◽  
pp. 38-45
Author(s):  
Zi Jian Liu ◽  
Bo Diao ◽  
Xiao Ning Zheng
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Degradation Mechanism ◽  
Fatigue Loading ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Self Healing ◽  
Fatigue Load ◽  
Seawater Corrosion ◽  
Fatigue Loads

The durability of coastal reinforced concrete bridge structures will be deteriorated during service due to fatigue loads and Chloride erosion. Through the microscopic tests of reinforced concrete beams after fatigue and seawater corrosion, 10 reinforced concrete beams divided into 5 groups subjected to different fatigue loads were investigated under the alternative action of seawater corrosion, where the deterioration of concrete was degraded. From the experiment, it can be concluded that there was significant self-healing phenomenon on the cracked beams by fatigue loading; And there was regular and clear microcracks in the beams when the maximum fatigue load between 0.16~0.24Pu; the cracks of the beams became obvious,micro cracks increased and crystals can be significantly seen in cracks and low lying location when the maximum fatigue load exceeds 0.24Pu.

A Method for Calculating Cracking Moment of FRP Reinforced Concrete Beam

2021 ◽  
Vol 896 ◽  
pp. 141-147
Author(s):  
Duy Nguyen Phan
Keyword(s):  
Reinforced Concrete ◽  
Modulus Of Elasticity ◽  
Parametric Study ◽  
Concrete Beams ◽  
Reinforced Concrete Beam ◽  
Reinforcement Ratio ◽  
Reinforced Concrete Beams ◽  
Comparison Results ◽  
Study Results ◽  
Frp Reinforcement

This paper presents an analytical method for calculating the cracking moment of concrete beams reinforced with fiber reinforced polymer (FRP) bars, which considers the non-linear behavior of concrete in the tension zone and the contribution of FRP reinforcement. Theoretical cracking moments obtained by the proposed method were verified with the experimental results and the theoretical results calculated according to ACI 440.1R-15. The comparison results show good agreement between theoretical and experimental data. A parametric study on the effect of longitudinal FRP reinforcement ratio and elastic modulus of FRP on the cracking moment of FRP reinforced concrete beams also were done by using the proposed method. The parametric study results show that both longitudinal reinforcement and modulus of elasticity of FRP significantly affect the cracking moment of FRP reinforced concrete beams. Moreover, parametric study results also clarify the weakness of ACI 440.1R-15 in determining the cracking moment of concrete beams reinforced with a large amount of FRP reinforcement ratio and with high modulus of elasticity of FRP.

scholarly journals Durability of RC Beams Strengthened Using GFRP-Sheet due to Fatigue Loads

2019 ◽  
Vol 280 ◽  
pp. 04012
Author(s):  
Tata Arbain ◽  
Raffel Anthonius Frederik ◽  
Ihsan Muhammad ◽  
Djamaluddin Rudy
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Maximum Load ◽  
Reinforced Concrete Beams ◽  
Glass Fiber Reinforced ◽  
Secondary Failure ◽  
Fatigue Loads ◽  
Monotonic Loads ◽  
Comparative Results ◽  
Reinforcement Bar

This paper presented the results of an experimental study of the behaviour of flexural beams strengthened with the glass fiber reinforced polymer (GFRP-S). This research was carried out to determine the effect of fatigue loads on the flexural capacity of reinforced concrete beams. The specimens were rectangular with a dimension of 150 mm in width, 200 mm in height, and 3300 mm in length. Four distinct conditions had been applied to this experiment. For the initial condition, two beams were tested under monotonic loads (maximum load control) as a control beam (BN). Sinusoidal fatigue loads were applied to four specimens from 4 kN to 24 kN (BF). Our comparative results of the experiment had presented that the normal beams (BN) failed after 800,000 loads cycle, while, the reinforced beams with GFRP (BF) failed after 1,231,860 loads cycle. Based on our results, it can be stated generally that fatigue life of the reinforcement beams (BF) could increase to more than 100% compared to that of the normal beams (BN). The failure of the beams is probably caused by fatigue of the reinforcement bar and debonding of the GFRP-S, both are secondary failure mechanism of reinforced concrete beams.

scholarly journals Fatigue Crack Inspection and Acoustic Emission Characteristics of Precast RC Beam under Repetition Loading

2015 ◽  
Vol 773-774 ◽  
pp. 1022-1026 ◽  
Author(s):  
Md Noor Noorsuhada ◽  
Ibrahim Azmi ◽  
Muhamad Bunnori Norazura ◽  
Mohd Saman Hamidah ◽  
Mat Saliah Soffian Noor ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Fatigue Crack ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Signal Strength ◽  
Fatigue Loading ◽  
Reinforced Concrete Beam ◽  
Crack Pattern ◽  
Reinforced Concrete Beams

Fatigue crack of the precast reinforced concrete beam under repetition loading is vital to be examined. Reinforced concrete structures exposed to excessive repetition loading could lead to the failure of the structures. In order to examine the active fatigue crack, the reinforced concrete beams were subjected to three-point repetition maximum loading. Eight phases of maximum fatigue loading with sinusoidal wave, frequency of 1 Hz and 5000 cycles for each phase were performed on the reinforced concrete beams. The inspection was carried out with visual observation of the crack pattern and acoustic emission technique for each load phase. The signal strength of acoustic emission was investigated. It is found that the signal strength of acoustic emission and crack pattern of the reinforced concrete beam subjected to repetition loadings showed promising results for structural health monitoring.

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