Wavelet-based damage localization and severity estimation of experimental RC beams subjected to gradual static bending tests

Structures ◽  
2021 ◽  
Vol 34 ◽  
pp. 3055-3069
Author(s):  
Hashem Jahangir ◽  
Hamed Hasani ◽  
Mohammad Reza Esfahani
Keyword(s):  
Damage Localization ◽  
Rc Beams ◽  
Bending Tests ◽  
Severity Estimation

Experimental Free Vibration of Damaged RC Beam Models

2019 ◽  
Vol 827 ◽  
pp. 499-504
Author(s):  
R. Capozucca ◽  
E. Magagnini ◽  
M.V. Vecchietti
Keyword(s):  
Free Vibration ◽  
Experimental Tests ◽  
Concrete Cover ◽  
Rc Beam ◽  
Rc Beams ◽  
Response Functions ◽  
Bending Tests ◽  
Damage Degree ◽  
Real Scale ◽  
Theoretical Results

Reinforced Concrete (RC) Beam undamaged and damaged were investigated by free vibration to obtain a variation of frequency values at different degree of damage. Experimental tests were carried out on RC beams in scale and in real scale. The damage of RC beams in real scale was obtained by cracking under static bending tests, while in the case of beam in scale is obtained by notches on the concrete cover with different width. In general, the effects on the dynamic response of diffused damages and of concentrated damages on a section of beam have been experimentally analyzed. The envelope of frequency response functions (FRFs) obtained by dynamic experimental tests was elaborated and the changes of natural frequency values were then correlated to the damage degree of RC beams. The experimental data have been discussed and analyzed by comparison with theoretical results.

EXPERIMENTAL RESEARCH OF RC BEAMS IN COMBINATION WITH GLASS-PLASTIC BARS

2016 ◽  
Vol 2 (1) ◽  
pp. 60-64 ◽  
Author(s):  
Смоляго ◽  
Gennadiy Smolyago ◽  
Фролов ◽  
Nikolay Frolov ◽  
Полоз ◽  
...  
Keyword(s):  
Cross Section ◽  
Experimental Research ◽  
Strain Condition ◽  
Glass Plastic ◽  
Rc Beams ◽  
Stress Strain ◽  
Bending Tests ◽  
Different Content

The results of bending tests of RC beams with different content (50 % and 100 %) of glass-plastic bars in tensioned area of cross-section are given in the article. Dependence between stress-strain condition parameters for such elements and quantity of glass-plastic bars is determined. All beams were ruptured by inclined section, what is explained in the article. This type of reinforcement is found out to be ineffective in comparison with traditional ones. Further research will consider portion of glass-plastic bars reduced to 30 % of total amount of reinforcement.

Cross Modal Strain Energy Method for Damage Detection Using Limited Modal Data

2013 ◽  
Vol 284-287 ◽  
pp. 1285-1289 ◽  
Author(s):  
Shu Qing Wang ◽  
Min Zhang ◽  
Fu Shun Liu
Keyword(s):  
Iterative Process ◽  
Strain Energy ◽  
Numerical Study ◽  
Damage Localization ◽  
Modal Strain Energy ◽  
Modal Data ◽  
Severity Estimation ◽  
Modal Strain Energy Method ◽  
Numerical Result ◽  
Strain Energy Method

This paper extends the recently developed cross modal strain energy (CMSE) method for damage localization and severity estimation, using limited modal data, with iterative process. For investigating the performance and verifying the effectiveness of the present CMSE method, the numerical study of this article chooses a damaged beam that was investigated in a published article. The numerical result indicates that the CMSE method is capable of detecting the damage locations and estimating their severities properly, even when only few spatially incomplete, noisy modes are utilized.

scholarly journals Analysis of static response of RC beams with NSM CFRP/GFRP rods

2021 ◽  
Vol 15 (58) ◽  
pp. 402-415
Author(s):  
Erica Magagnini ◽  
Roberto Capozucca ◽  
Maria Vittoria Vecchietti
Keyword(s):  
Carbon Fiber ◽  
Linear Response ◽  
Bending Moment ◽  
Elastic Behavior ◽  
Rc Beams ◽  
Static Response ◽  
Near Surface ◽  
Bending Tests ◽  
Surface Method ◽  
Glass Frp

In this paper experimental results of investigation on reinforced concrete (RC) beams strengthened with the near surface method (NSM) are analyzed considering the response under bending tests on two beams. One of the RC beams was damaged by bending until the yield of reinforcement and successively strengthened with carbon fiber polymer (CFRP) rod, while the second beam was strengthened with glass-FRP rod. Both the beams have been subjected to bending tests until failure. Experimental diagrams and discussion on static response are presented in the paper. It also places a particular emphasis on the non-linear response of RC sections strengthened with CFRP and GFRP rods under bending moment beyond the first elastic behavior.

A Multi-Hierarchical Damage Identification Method for Jacket Platform Using BP Neural Network

2012 ◽  
Vol 166-169 ◽  
pp. 1170-1175
Author(s):  
Xiang Yu Chen ◽  
Sha Sha Dong ◽  
Fu Shun Liu
Keyword(s):  
Neural Network ◽  
Bp Neural Network ◽  
Damage Identification ◽  
Offshore Structures ◽  
Common Type ◽  
Damage Localization ◽  
Jacket Platform ◽  
Identification Method ◽  
Severity Estimation ◽  
Diagnosis Method

Jacket-type platforms may be the most common type of offshore structures, and damage localization and severity estimation is important for these structures. This paper employs a multi-hierarchical damage identification method based on BP neural network to detect damages in jacket platforms. Firstly, the damaged storey of the jacket is detected, and the numbers of the elements among the detected storey are then detected. According to this method, the learning samples can be more targeted and the number can be reduced largely. In the end, a jacket model is used to investigate the performance of this method, and the results indicate that this approach is more effective and has higher accuracy than direct diagnosis method.

scholarly journals Laboratory Tests of Concrete Beams Reinforced with Recycled Steel Fibres and Steel Bars

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6752
Author(s):  
Małgorzata Pająk ◽  
Grzegorz Wandzik
Keyword(s):  
Tensile Tests ◽  
Image Correlation ◽  
Partial Replacement ◽  
Rc Beams ◽  
Bending Tests ◽  
Steel Fibres ◽  
Four Point Bending ◽  
Steel Bars ◽  
Cracking Pattern ◽  
Recycled Steel

This paper explores the possibility of the partial replacement of the longitudinal reinforcement in reinforced concrete (RC) beams with recycled steel fibres (RSF). Testing was focused on the contribution of two volume ratios of the RSF—0.5%, 1.0%. Basic compression and flexural tensile tests were performed to evaluate the effectiveness of the fibres following current standards. Additionally, the full-scale beams with and without conventional reinforcement were subjected to four-point bending tests. The results indicate that RSF improved the load-bearing capacity of the RC beams. Cooperation of RSF with the steel bars in carrying loads was proved. Findings from the Digital Image Correlation (DIC) revealed no impact on the cracking pattern of the RC beams.

Cross Modal Strain Energy Method for Damage Localization and Severity Estimation

2007 ◽  
Author(s):  
Shuqing Wang ◽  
Huajun Li ◽  
Sau-Lon James Hu
Keyword(s):  
Strain Energy ◽  
Numerical Study ◽  
Element Model ◽  
Damage Localization ◽  
Modal Strain Energy ◽  
Damage Diagnosis ◽  
Damage Scenarios ◽  
Severity Estimation ◽  
Modal Strain Energy Method ◽  
Diagnosis Method

A cross modal strain energy (CMSE) damage diagnosis method, which is capable of localizing the damages and estimating their severities, is presented. The numerical study uses measurements synthesized from a finite element model of a laboratory-scaled offshore platform. Several damage scenarios are investigated, including: single/double damaged element(s), with/without measurement noise. Numerical results suggest that good performance on both damage location and severity assessment can be achieved by implementing the CMSE method.

Mechanism and Experimental Verification of Degradation of RC Beams Induced by Concrete/Rebar Bonding Failure

2010 ◽  
Vol 452-453 ◽  
pp. 877-880 ◽  
Author(s):  
Xiao Bing He ◽  
F. Huang ◽  
C.Y. Zhang
Keyword(s):  
Crack Closure ◽  
Structural Damage ◽  
Degradation Mechanism ◽  
Failure Process ◽  
Plastic Film ◽  
Rc Beams ◽  
Bending Tests ◽  
Rc Structures ◽  
Bending Performance ◽  
Bonding Failure

From the perspective of Fracture Mechanics, concrete/rebar bonding failure process in reinforced concrete (RC) structures means the decreasing of the crack closure force imposed by rebar in RC beams, which will result in crack propagation, and eventually structural damage. In this paper the crack-arresting mechanism of the concrete/rebar bonding stress in RC beams was analyzed, which was employed to reveal the degradation mechanism of RC beams induced by concrete/rebar bonding failure; and bending tests of RC beams were presented where effects of concrete/rebar bonding failure on bending performance of RC beams had been investigated. The concrete/rebar bonding failure was obtained by wrapping the rebar with different length of plastic film during casting. The results shows effective concrete/rebar bonding is the key to provide crack closure force, which can prevent functional degradation of RC beams.

Behavior of RC Beams Strengthened by CFRP and Steel Rope under Frequent Impact Load

2018 ◽  
Vol 1 (1) ◽  
pp. 30-42
Author(s):  
Muataz Ali ◽  
◽  
Yaseen Saleh ◽  
Luna Al Hasani ◽  
Ammar Khazaal ◽  
...  
Keyword(s):  
Impact Load ◽  
Rc Beams ◽  
Steel Rope
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