A Numerical Investigation on the Structural Behavior of Deficient Steel Frames Strengthened using CFRP Composite

Keykha, Amir Hamzeh

doi:10.9744/ced.20.1.1-7

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…utilized for the last 30 years by the aircraft, space and many industries, may be employed to strengthen existing structures for civil engineering purposes. Recently, application of fiber reinforced plastic composite system by gluing them to external part of the reinforced concrete structures is gradually becoming popular for the aim of repairing and strengthening (Yang et al 2017), Keykha (2017), (Smyrou et al 2015), Elwan and Omar (2014). Fibers to be used, as they have required characteristics include: glass, aramid and carbon.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of Model Steel Structures Retrofitted with GFRP Composites under Microtremor Vibration

Günday¹,

Aydin²,

Tuhta³

2019

IJTSRD

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There are many varieties of the structural and architectural structures strengthened with different FRP composites are gaining popularity, and there is a growing need to understand and compare the behavior of these structures before-after GFRP composite strengthening. In this study, model steel structure was tested on the bench-scale earthquake simulator (The Quanser Shake Table) using ambient vibration, to determine the dynamic response. After this, slabs of the model steel structure was strengthened with GFRP composite, and tested on the bench-scale earthquake simulator (The Quanser Shake Table) using ambient vibration, to determine the dynamic behavior. Finally, dynamic responses of model steel structure before and after GFRP composite strengthening, such as displacements and maximum-minimum acceleration, were compared. At the end of the study, it is seen that displacements had decreased along the height of the model steel structure. Also, it is seen from the earthquake analyses that GFRP strengthening is very effective on the dynamic responses of the model steel structure.

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Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of Model Steel Structures Retrofitted with GFRP Composites under Microtremor Vibration

Günday¹,

Aydin²,

Tuhta³

2019

IJTSRD

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“…More work should be done to clarify the performance of structures under seismic loads. Recently, application of fiber reinforced plastic composite system by gluing them to external part of the reinforced concrete structures is gradually becoming popular for the aim of repairing and strengthening (Yang et al 2017), Keykha (2017), (Smyrou et al 2015), Elwan and Omar (2014). Fibers to be used, as they have required characteristics include: glass, aramid and carbon.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Tunnel Form Building Retrofitted with CFRP using Finite Element Method

Ziada¹,

Tuhta²,

Tammam³

2019

IJTSRD

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Many regions where have the earthquake risk around the world, many buildings in developing countries are ineffective in front of earthquake forces. Recent years, the fabrics which are strengthening with carbon fiber-reinforced polymer (CFRP) have become a very common material to strengthen the reinforced concrete buildings. In our country, mostly column jacketing and partition systems are used. They are also followed with steel jacketing and trussed steel joist systems. Reinforcement with composites named FRP (fiber-reinforced polymer) are getting common slowly by slowly in our country. Since fibers are hightensile steel, they increase the strength of joist and covering deflection. If it is used in the direction of tensile, it also saves the strength for shearing. In this study,1 mm CFRP hardware is applied to the each covering of a 16-floor reinforced concrete building which is made with tunnel formwork system. In this analysis done with SAP2000 program, increase in the frequency of a reinforced concrete building is observed; structure which has less in cycle is appeared. These results show us that CFRP hardware's make and %38 increase in the rigid of structure.

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“…Carbon fiber-reinforced polymer (CFRP) is extensively applied in structural engineering due to its high strength to weight ratio, high stiffness and powerful corrosion resistance [ 1 , 2 , 3 , 4 ]. However, internal and invisible defects can significantly deteriorate the residual stiffness and load-bearing capacity of CFRP [ 5 , 6 , 7 , 8 ], hence detecting such defects of CFRP is critical to guarantee the safety of CFRP structures.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Visibility of Delamination during Pulsed Thermography of Carbon Fiber-Reinforced Plates Using a Stacked Autoencoder

Xie

et al. 2018

Sensors

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The effectiveness of pulsed thermography (PT) for detecting delamination in carbon fiber-reinforced polymer (CFRP) plates has been widely verified. However, delaminations are usually characterized by weak visibility due to the influences of inspection factors and the delaminations with weak visibility are easily missed in real inspections. In this study, by introducing a deep learning algorithm—stacked autoencoder (SAE)—to PT, we propose a novel approach (SAE-PT) to enhance the visibility of delaminations. Based on the ability of SAE to learn unsupervised features from data, the thermal features of delaminations are extracted from the raw thermograms. The extracted features are then employed to construct SAE images, in which the visibility of delaminations is expected to be enhanced. To test the performance of SAE-PT, we inspected CFRP plates with prefabricated delaminations. By implementing SAE-PT on the raw inspection data, the delaminations were more clearly indicated in the constructed SAE images. We also compare SAE-PT to the widely used principal component thermography (PCT) method to further verify the validity of the proposed approach. The results reveal that compared to PCT, SAE-PT can show delaminations in CFRP with higher contrast. By effectively enhancing the delamination visibility, SAE-PT thus has potential for improving the inspection accuracy of PT for non-destructive testing (NDT) of CFRP.

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A Numerical Investigation on the Structural Behavior of Deficient Steel Frames Strengthened using CFRP Composite

Cited by 10 publications

References 18 publications

Dynamic Analysis of Model Steel Structures Retrofitted with GFRP Composites under Microtremor Vibration

Dynamic Analysis of Model Steel Structures Retrofitted with GFRP Composites under Microtremor Vibration

Analysis of Tunnel Form Building Retrofitted with CFRP using Finite Element Method

Enhancing the Visibility of Delamination during Pulsed Thermography of Carbon Fiber-Reinforced Plates Using a Stacked Autoencoder

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