scholarly journals An Investigation of Crack Propagation in Steel Fiber-Reinforced Composite Beams

2018 ◽  
Author(s):  
Adam Soto ◽  
Fariborz M. Tehrani
Keyword(s):  
Composite Beam ◽  
Peak Load ◽  
Experimental Studies ◽  
Fiber Reinforcement ◽  
Composite Beams ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Premature Failure ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite

This paper investigates the cracking phenomena of fiber-reinforced concrete in steel and concrete composite beam systems. Various parameters contribute to the crack development and weakening of the composite system, while the concrete slab is bonded to the steel beam. The weakening can result from the longitudinal shear stress that causes cracking from shear connectors, cracking from tensile forces, crushing due to compressive forces and also cracking from concrete shrinkage. These cracks can contribute to premature failure of the composite beam. This paper investigates fiber reinforcement as a solution to decrease the amount of cracking in composite beams. The presented methodology includes experimental studies to evaluate cracking characteristics and strength of fiber-reinforced composite beams. Parameters of the study included spacing between studs, application of welded wire reinforcement, and fiber reinforcement. Results indicate the effectiveness of fiber-reinforcement in reducing crack widths and number of cracks, even though, spacing between studs and presence of welded wire were essential in crack control. Further, fiber-reinforced specimens showed higher compressive and tensile strength by 30% and 70% respectively. The deflection at the peak load also showed a 23% decrease for the specimen with hybrid fiber-wire reinforcement in comparison with the specimen reinforced with welded wire only.

Damage Detection in Fiber-Reinforced Composite Beams by Using a Bayesian Fusion Method

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
U. Baneen ◽  
J. E. Guivant
Keyword(s):  
Damage Detection ◽  
Composite Beam ◽  
Simulated Data ◽  
Composite Beams ◽  
Optimal Sampling ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Damage Indices ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced

This paper presents a method for the detection of damage present in composite beam-type structures. The method, which successfully detected damage in steel beams, is applied to a glass fiber-reinforced beam in order to verify its suitability for composite structures as well. The damage indices were obtained using the gapped-smoothing method (GSM), which does not require a baseline model in order to detect damage. Despite the advantage of avoiding the need for a reference model altogether, unavoidable measurement errors make GSM rather ineffective. The proposed method uses the damage indices that GSM provides for synthesizing a set of likelihood functions that is processed under a Bayesian approach in order to reduce the effect of the noise and other uncertainty sources. The quality of the damage detection was examined by investigating an optimal sampling size analytically, and it was demonstrated through numerical simulation. This paper details the theory of the noise suppression method based on Bayesian data fusion, includes an analysis of the optimal sampling size, and presents the experimental results for two glass fiber-reinforced composite beams with a narrow and wide delamination, respectively. A noise-addition process was applied to the simulated data considering two different noise distributions. The composite beam was modeled in ANSYS, and harmonic analysis was used to obtain the frequency response functions at different beam locations. The results were obtained by adding 5, 10, and 15% noise in the simulated data, and they were then validated from the experimental results.

Vibration Analysis of Carbon Fiber-Reinforced Steel–Concrete Composite Beams Considering Shear-Slip Effects

2019 ◽  
Vol 19 (07) ◽  
pp. 1950077 ◽  
Author(s):  
Jing Wang ◽  
Jiageng Ren ◽  
Yunlong Zhang
Keyword(s):  
Carbon Fiber ◽  
Composite Beam ◽  
Composite Beams ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Slip Effects ◽  
Reinforced Steel ◽  
Shear Slip ◽  
Carbon Fiber Reinforced

This paper presents an accurate analysis of the natural frequency and mode shape of carbon fiber-reinforced steel–concrete composite beam with double-slip surfaces. To study the flexural vibration of the composite beam, a governing differential equation considering the shear-slip effects of two interfaces is formulated. Based on this formulation, the natural frequency and mode shape of carbon fiber-reinforced composite beams are calculated. For comparison purpose, numerical simulations of the composite beams are conducted using the ANSYS in order to verify the present results. High consistency in the two calculation values is revealed. In addition, carbon fiber-reinforced composite beams are fabricated and tested. It is found that the experimental values agreed well with the theoretical results. The findings from this study may provide the benchmark reference for engineering analysis and design of carbon fiber-reinforced steel–concrete composite beams.

Nondestructive health monitoring of cracked simply supported fiber-reinforced composite structures

2011 ◽  
Vol 22 (18) ◽  
pp. 2207-2214 ◽  
Author(s):  
Mohamed S. Gaith
Keyword(s):  
Health Monitoring ◽  
Composite Structures ◽  
Crack Depth ◽  
Composite Beams ◽  
Mode Shapes ◽  
Crack Identification ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Simply Supported ◽  
Reinforced Composite

A crack on a structural member introduces a local flexibility that is a function of crack depth. This flexibility changes the dynamic behavior of the system and its stability characteristics. A continuous cracked beam vibration theory is implemented for the lateral vibration of cracked Euler–Bernoulli beams with single-edge open cracks. In this study, the crack identification (health monitoring) for simply supported graphite/epoxy fiber-reinforced composite beams is considered. The effects of crack depth and location, fiber orientation, and fiber volume fraction on the flexibility and consequently on natural frequency and mode shapes for cracked fiber-reinforced composite beams are investigated.

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