Guided Wave Based Debonding Detection in CFRP-Reinforced Steel Structures

2020 ◽  
pp. 1013-1021
Author(s):  
Jingrong Li ◽  
Ye Lu
Keyword(s):  
Steel Structures ◽  
Guided Wave ◽  
Debonding Detection ◽  
Reinforced Steel

scholarly journals Damage Mechanisms of Polymer Impregnated Carbon Textiles Used as Anode Material for Cathodic Protection

2018 ◽  
Vol 9 (1) ◽  
pp. 110 ◽  
Author(s):  
Amir Asgharzadeh ◽  
Michael Raupach
Keyword(s):  
Anode Material ◽  
Corrosion Protection ◽  
Influencing Factors ◽  
Cathodic Protection ◽  
Anodic Polarization ◽  
Steel Structures ◽  
Damage Mechanisms ◽  
Environmental Media ◽  
Reinforced Steel

Carbon textiles as anode material for cathodic corrosion protection (CP) have been used in several reinforced steel structures. However, experience with durability is limited. To date, various influencing factors have been discovered and systematic tests on different carbon textiles with different impregnation materials in various environmental media have been carried out and considered the degradation of the impregnation materials. In this work the boundary potentials are determined at which the impregnation and sizing is destroyed under anodic polarization and the damage mechanisms are described.

scholarly journals Core–skin debonding detection in honeycomb sandwich structures through guided wave wavefield analysis

2018 ◽  
Vol 30 (9) ◽  
pp. 1306-1317 ◽  
Author(s):  
Lingyu Yu ◽  
Zhenhua Tian ◽  
Xiaopeng Li ◽  
Rui Zhu ◽  
Guoliang Huang
Keyword(s):  
Guided Waves ◽  
Sandwich Structures ◽  
Lamb Waves ◽  
Laser Doppler Vibrometer ◽  
Low Frequency ◽  
Guided Wave ◽  
Honeycomb Sandwich ◽  
Debonding Detection ◽  
The Waves ◽  
Detection And Quantification

Ultrasonic guided waves have proven to be an effective and efficient method for damage detection and quantification in various plate-like structures. In honeycomb sandwich structures, wave propagation and interaction with typical defects such as hidden debonding damage are complicated; hence, the detection of defects using guided waves remains a challenging problem. The work presented in this article investigates the interaction of low-frequency guided waves with core–skin debonding damage in aluminum core honeycomb sandwich structures using finite element simulations. Due to debonding damage, the waves propagating in the debonded skin panel change to fundamental antisymmetric Lamb waves with different wavenumber values. Exploiting this mechanism, experimental inspection using a non-contact laser Doppler vibrometer was performed to acquire wavefield data from pristine and debonded structures. The data were then processed and analyzed with two wavefield data–based imaging approaches, the filter reconstruction imaging and the spatial wavenumber imaging. Both approaches can clearly indicate the presence, location, and size of the debonding in the structures, thus proving to be effective methods for debonding detection and quantification for honeycomb sandwich structures.

Interfacial debonding detection of strengthened steel structures by using smart CFRP-FBG composites

2019 ◽  
Vol 28 (11) ◽  
pp. 115001 ◽  
Author(s):  
Hua-Ping Wang ◽  
Yi-Qing Ni ◽  
Jian-Guo Dai ◽  
Mao-Dan Yuan
Keyword(s):  
Steel Structures ◽  
Interfacial Debonding ◽  
Debonding Detection

Experimental and numerical study of CFRP reinforced steel beams

2020 ◽  
pp. 147509022096026
Author(s):  
Minos E Kypriadis ◽  
Elias P Bilalis ◽  
Nicholas G Tsouvalis
Keyword(s):  
Large Scale ◽  
Numerical Study ◽  
Load Capacity ◽  
Steel Structures ◽  
High Strength ◽  
Maximum Load ◽  
Steel Beams ◽  
High Fatigue ◽  
Reinforced Steel ◽  
Large Scale Tests

The use of composite materials patches for the reinforcement of steel structures attracts particular interest. Due to their high strength, light weight, and high fatigue and corrosion resistance, composite patches represent a versatile reinforcement solution. In this paper, the reinforcement of steel beams with CFRP patches is examined. Large scale tests of “H” and “square hollow” cross section steel beams are conducted. The beams are reinforced with CFRP patches, investigating the effect of the thickness and the length of the patch, and the type of the cohesive joint. All reinforced specimens showed increase of their stiffness and their maximum load capacity. Furthermore, advanced finite element models are developed for the simulation of the mechanical behavior of the reinforced steel beams. FE results relate very well to the experimental ones for most of the measured magnitudes, thus verifying the reliability of the developed models in estimating stiffness, yield load and maximum load capacity of the beams.

scholarly journals Investigation of Behaviors of Concrete Shear Wall in High-Rise Steel Buildings

2018 ◽  
Vol 7 (3.2) ◽  
pp. 135
Author(s):  
Hajiyev Mukhlis Ahmad ◽  
Hasan Dabbaghasadollahi Poor
Keyword(s):  
Time History ◽  
Shear Walls ◽  
Steel Structures ◽  
Shear Wall ◽  
Target Point ◽  
Steel Buildings ◽  
High Rise ◽  
Reinforced Steel ◽  
Structural Plan ◽  
Nonlinear Time History

This study focuses on an analytical study on reinforced steel structures with concrete shear wall. The structures studied was analyzed using nonlinear time history method and the effect of installing  concrete shear walls in the structural plan on the target point displacement. By comparing the roofs' displacement diagrams in different structures with different layout of the shear wall in the plan, it is concluded that in order to achieve the proper result in the design of the structures, the shear walls must be located in the middle of the plan in form of core and enclosed with structural columns.  

scholarly journals Failure Analysis of Locally Damaged Slender Steel Bars Strengthened with CFRP Composites: Experiments, Theory, and Computational Simulations

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Bin Li ◽  
Hua Luo ◽  
Xianqiao Wang
Keyword(s):  
Steel Structures ◽  
Critical Force ◽  
Damage Degree ◽  
Reinforced Polymer ◽  
Cfrp Composites ◽  
Load Carrying ◽  
Steel Bars ◽  
Reinforced Steel ◽  
Buckling Failure ◽  
The Stability

Carbon fiber-reinforced polymer/plastic (CFRP) composites bear attractive performance in resistance to tension, fatigue, and corrosion and, thus, have been recognized as a promising candidate for repairing and strengthening steel structures in engineering. Here, we combine experiments, theory, and numerical simulations to elucidate how the location and degree of local damages, as well as the reinforcement mode, affect the stability of slender steel bars repaired by CFRP. The deformation, failure mode, and the critical buckling load of the reinforced steel flat bars subjected to axial compressive forces are experimentally evaluated. We show that all tested specimens exhibit buckling failure, before which the damaged steel bars have entered an elastic-plastic stage. Our theoretical analysis provides an upper bound for the critical force, which is sensitive not only to the damage degree but also to the damage location. Damage locating at the middle regime of the specimens will remarkably reduce stability of the steel bars, but an optimized combination of wrapping method and number of CFRP layers can restore and even enhance the stability of the damaged structures beyond the undamaged counterparts. Finite element simulations are implemented in the same scenario as experiments, showing good agreement with our measurements. Our findings suggest that, to improve the stability of the damaged steel bars reinforced by CFRP, the load carrying capacity of the the bars, the number of CFRP layers, and the construction convenience should be taken into account.

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