scholarly journals Optimal Localization of Smart Aggregate Sensor for Concrete Damage Monitoring in PSC Anchorage Zone

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6337
Author(s):  
Quang-Quang Pham ◽  
Ngoc-Loi Dang ◽  
Quoc-Bao Ta ◽  
Jeong-Tae Kim
Keyword(s):  
Damage Detection ◽  
Prestressed Concrete ◽  
Impedance Model ◽  
Artificial Damage ◽  
Smart Aggregate ◽  
Damage Monitoring ◽  
Concrete Damage ◽  
Potential Damage ◽  
Optimal Localization ◽  
Real Scale

This study investigates the feasibility of smart aggregate (SA) sensors and their optimal locations for impedance-based damage monitoring in prestressed concrete (PSC) anchorage zones. Firstly, numerical stress analyses are performed on the PSC anchorage zone to determine the location of potential damage that is induced by prestressing forces. Secondly, a simplified impedance model is briefly described for the SA sensor in the anchorage. Thirdly, numerical impedance analyses are performed to explore the sensitivities of a few SA sensors in the anchorage zone under the variation of prestressing forces and under the occurrence of artificial damage events. Finally, a real-scale PSC anchorage zone is experimentally examined to evaluate the optimal localization of the SA sensor for concrete damage detection. Impedance responses measured under a series of prestressing forces are statistically quantified to estimate the performance of damage monitoring via the SA sensor in the PSC anchorage.

scholarly journals Use of Time- and Frequency-Domain Approaches for Damage Detection in Civil Engineering Structures

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
V. H. Nguyen ◽  
J. Mahowald ◽  
S. Maas ◽  
J.-C. Golinval
Keyword(s):  
Damage Detection ◽  
Frequency Domain ◽  
Prestressed Concrete ◽  
Civil Engineering ◽  
Damage Identification ◽  
Real Life ◽  
Hankel Matrix ◽  
Principal Component ◽  
Engineering Structures ◽  
Civil Engineering Structures

The aim of this paper is to apply both time- and frequency-domain-based approaches on real-life civil engineering structures and to assess their capability for damage detection. The methodology is based on Principal Component Analysis of the Hankel matrix built from output-only measurements and of Frequency Response Functions. Damage detection is performed using the concept of subspace angles between a current (possibly damaged state) and a reference (undamaged) state. The first structure is the Champangshiehl Bridge located in Luxembourg. Several damage levels were intentionally created by cutting a growing number of prestressed tendons and vibration data were acquired by the University of Luxembourg for each damaged state. The second example consists in reinforced and prestressed concrete panels. Successive damages were introduced in the panels by loading heavy weights and by cutting steel wires. The illustrations show different consequences in damage identification by the considered techniques.

Evaluation of internal blast resistance of bi-directionally prestressed concrete tubular structure according to ANFO explosive charge weight

2021 ◽  
Author(s):  
Ji-Hun Choi ◽  
Seung-Jai Choi ◽  
Tae-Hee Lee ◽  
Dal-Hun Yang ◽  
Jang-Ho Jay Kim
Keyword(s):  
Prestressed Concrete ◽  
Explosive Charge ◽  
Blast Resistance ◽  
Crack Pattern ◽  
Structural Behavior ◽  
Charge Weight ◽  
Property Damage ◽  
Blast Pressure ◽  
Prestressing Loss ◽  
Real Scale

When extreme loading from an internal is applied to prestressed concrete (PSC) structures, serious property damage and human casualties may occur. However, existing designs for PSC structures such as prestressed concrete containment vessels (PCCV) do not include features to protect the structure from the blasts. Therefore, the internal blast resistance capacity of PSC structures is evaluated by internal blast tests on bi-directional PSC tubular members. The goal of the study was to obtain the structural behavior data from an internal detonation. The ANFO charges were detonated at the center of the mid-span of the tube specimen with a standoff distance of 1,000 mm. The data acquired included blast pressure, deflection, strain, crack pattern, and prestressing loss. The data are used derive the equations to calculate the required internal blast charge weight to fail a real-scale PCCV and to calibrate a commercial simulation program to be used for internal blast simulations.

Smart Aggregate-Based Damage Detection of Circular RC Columns under Cyclic Combined Loading

2010 ◽  
Author(s):  
Yashar Moslehy ◽  
Haichang Gu ◽  
Abdeljalil Belarbi ◽  
Y. L. Mo ◽  
Gangbing Song
Keyword(s):  
Damage Detection ◽  
Combined Loading ◽  
Rc Columns ◽  
Smart Aggregate

scholarly journals Piezoceramic-Based Damage Monitoring of Concrete Structure for Underwater Blasting

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1672 ◽  
Author(s):  
Jianfeng Si ◽  
Dongwang Zhong ◽  
Wei Xiong
Keyword(s):  
Damage Detection ◽  
Piezoelectric Transducer ◽  
Impact Load ◽  
Wavelet Packet ◽  
Blast Hole ◽  
Damage Index ◽  
Underwater Explosion ◽  
Damage Monitoring ◽  
Concrete Materials ◽  
The Impact

This paper developed a piezoelectric-transducer-based damage detection of concrete materials after blasting. Two specimens (with or without an energy-relieving structure) were subjected to a 40 m deep-underwater blasting load in an underwater-explosion vessel, and their damage was detected by a multifunctional piezoelectric-signal-monitoring and -analysis system before and after the explosion. Statistical-data analysis of the piezoelectric signals revealed four zones: crushing, fracture, damage, and safe zones. The signal energy was analyzed and calculated by wavelet-packet analysis, and the blasting-damage index was obtained after the concrete specimen was subjected to the impact load of the underwater explosion. The damage of the two specimens gradually decreased from the blast hole to the bottom of the specimen. The damage index of the specimen with the energy-relieving structure differed for the fracture area and the damage area, and the damage protection of the energy-relieving structure was prominent at the bottom of the specimen. The piezoelectric-transducer-based damage monitoring of concrete materials is sensitive to underwater blasting, and with wavelet-packet-energy analysis, it can be used for postblasting damage detection and the evaluation of concrete materials.

New Damage Detection Method Based on Support Reaction and Mid-Span Displacement for Simply Supported Bridges

2010 ◽  
Vol 29-32 ◽  
pp. 1537-1542
Author(s):  
Z.J. Ma ◽  
S.J. Zhang
Keyword(s):  
Numerical Simulation ◽  
Damage Detection ◽  
Model Experiment ◽  
Direct Relationship ◽  
Detection Method ◽  
Simply Supported ◽  
Local Mass ◽  
Support Reaction ◽  
Basic Characteristics ◽  
Potential Damage

Capabilities to locate damage, and applicability to simply supported bridges are considered as basic characteristics of the method to be investigated in this paper. A new method which employs support reaction and mid-span displacement as indicators is presented to detect a certain type of damage. Unlike the existing study, this work proposes the direct relationship between the change in local mass caused by damage and the measured support reaction and mid-span displacement values. With the cooperation of inspection means, this method is capable of successfully identifying the location of local potential damage. The feasibility of this method is demonstrated by numerical simulation and model experiment.

THE EFFECT OF SHEAR REINFORCEMENT RATIO ON PRESTRESSED CONCRETE BEAMS SUBJECTED TO IMPACT LOAD

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Mohamad Elani ◽  
Yehya Temsah ◽  
Hassan Ghanem ◽  
Ali Jahami ◽  
Youmn Al Rawi
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Impact Load ◽  
Nonlinear Behavior ◽  
Element Model ◽  
Shear Reinforcement ◽  
Dynamic Increase Factor ◽  
Concrete Damage ◽  
Different Response ◽  
The Impact

Structural elements subjected to impact loads have a different response than those subjected to static loads. This research studied the effect of using shear reinforcement to reduce the local damage occurred when an impact load applied on a prestressed concrete beam. An accurate finite element model was provided for the analysis using the advanced volumetric finite element modeling program (ABAQUS). The concrete material was defined using the built in concrete damage plasticity model (CDP), that considers the nonlinear behavior of concrete when subjected to dynamic loading. All material properties were modified using the dynamic increase factor (DIF) to consider the effect of impact loading. It was realized that the failure was concentrated in the impact zone. However, using shear reinforcement reduced the permanent damage occurred due to impact.

Damage Detection in Composite Skin Stiffener with Hybrid PZT-FO SHM System

2017 ◽  
Vol 754 ◽  
pp. 367-370 ◽  
Author(s):  
Florian Lambinet ◽  
Zahra Sharif Khodaei
Keyword(s):  
Damage Detection ◽  
Hybrid System ◽  
Composite Structure ◽  
Composite Structures ◽  
Diagnostic System ◽  
Fibre Optic ◽  
Artificial Damage

A hybrid piezoelectric (PZT)/fibre optic diagnostic system has been developed for damage detection in built up composite structures. The hybrid system uses PZT transducers to actuate the structure and fibre optic (FO) sensors to capture the propagating wave. The diagnostic system will then have the advantages of both PZT and FO sensors. The applicability of the system is then tested for detecting an artificial damage at a skin/stiffener interface of a thick composite structure. The response of the FO sensors is then compared to PZT sensors and presented.

scholarly journals Multipoint Ultrasonic Diagnostics System Of Prestressed T-Beams

2014 ◽  
Vol 60 (4) ◽  
pp. 475-492
Author(s):  
A. Mariak ◽  
K. Wilde
Keyword(s):  
Wave Propagation ◽  
Damage Detection ◽  
Prestressed Concrete ◽  
Detection System ◽  
Concrete Bridge ◽  
Ultrasonic Wave Propagation ◽  
Ultrasonic Diagnostics ◽  
Material Discontinuities ◽  
Prestressed Concrete Bridge ◽  
Diagnostics System

AbstractThis paper is devoted to the application of ultrasonic wave propagation phenomena for the diagnostics of prestressed, concrete, bridge T-beams. A multi-point damage detection system is studied with use of numerically obtained data. The system is designed to detect the presence of the material discontinuities as well as their location.

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