Wave-Guided Acoustic Emission Signals of Concrete Slab Obtained by Fatigue Testing on Wheel-Load Machine

2017 ◽  
Vol 12 (3) ◽  
pp. 470-477
Author(s):  
Mitsuharu Shiwa ◽  
◽  
Zhengwang Li ◽  
Takuya Maeshima ◽  
Yasuhiro Koda ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Transverse Wave ◽  
Fatigue Testing ◽  
Concrete Slab ◽  
Wave Radiation ◽  
Live Load ◽  
Wheel Load ◽  
Reinforced Concrete Slab ◽  
Vertical Strain ◽  
Ae Signals

Wave-guided acoustic emission (AE) signals of a reinforced-concrete slab were evaluated by fatigue testing on a wheel-load machine. Two resonant AE sensors, each with a frequency of 60 kHz, were installed at both ends of a reinforcement rod used as an AE waveguides. The detected AE signals indicated the transverse-wave radiation patterns of vertical and horizontal cracks located at the interface between the concrete and the waveguide. The activity of the cumulative AE energies corresponded to the live-load deflection and vertical-strain phenomena.

scholarly journals Acoustic Emission Properties of Concrete Slab During Fatigue Testing with a Running-Wheel Load

2017 ◽  
Vol 11 (3) ◽  
Author(s):  
Mitsuharu Shiwa ◽  
Zhengwang Li ◽  
Takuya Maeshima ◽  
Yasuhiro Koda ◽  
Yasushi Tanaka
Keyword(s):  
Acoustic Emission ◽  
Fatigue Testing ◽  
Concrete Slab ◽  
Running Wheel ◽  
Wheel Load ◽  
Emission Properties

Discrimination of Acoustic Emission Signals for Damage Assessment in a Reinforced Concrete Slab Subjected to Seismic Simulations

2013 ◽  
Vol 38 (3) ◽  
pp. 303-310 ◽  
Author(s):  
Francisco A. Sagasta ◽  
Juan L. Torné ◽  
Antonio Sánchez-Parejo ◽  
Antolino Gallego
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Concrete Slab ◽  
Mechanical Energy ◽  
Low Frequency ◽  
Shaking Table ◽  
Reinforced Concrete Slab ◽  
Rc Structures ◽  
Steel Columns ◽  
Ae Signals

Abstract The purpose of this work is to distinguish between Acoustic Emission (AE) signals coming from mechanical friction and AE signals coming from concrete cracking, recorded during fourteen seismic simulations conducted with the shaking table of the University of Granada on a reinforced concrete slab supported on four steel columns. To this end, a particular criterion is established based on the Root Mean Square of the AE waveforms calculated in two different temporal windows. This criterion includes a parameter calculated by optimizing the correlation between the mechanical energy dissipated by the specimen (calculated by means of measurements with accelerometers and displacement transducers) and the energy obtained from the AE signals recorded by low-frequency piezoelectric sensors located on the specimen. The final goal of this project, initiated four years ago, is to provide a reliable evaluation of the level of damage of Reinforced Concrete specimens by means of AE signals to be used in future Structural Health Monitoring strategies involving RC structures.

Evaluation of Fatigue Damage in Reinforced Concrete Slab by Acoustic Emission.

1999 ◽  
pp. 251-259
Author(s):  
Shigenori YUYAMA ◽  
Zhang-Wang LI ◽  
Takeshi TOMOKIYO ◽  
Masaru YOSHIZAWA ◽  
Taketo UOMOTO
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Fatigue Damage ◽  
Concrete Slab ◽  
Reinforced Concrete Slab

Evaluation of fatigue damage in reinforced concrete slab by acoustic emission

2001 ◽  
Vol 34 (6) ◽  
pp. 381-387 ◽  
Author(s):  
S Yuyama ◽  
Z.-W Li ◽  
M Yoshizawa ◽  
T Tomokiyo ◽  
T Uomoto
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Fatigue Damage ◽  
Concrete Slab ◽  
Reinforced Concrete Slab

Damage assessed by wavelet scale bands and b-value in dynamical tests of a reinforced concrete slab monitored with acoustic emission

2015 ◽  
Vol 60-61 ◽  
pp. 75-89 ◽  
Author(s):  
Miguel E. Zitto ◽  
Rosa Piotrkowski ◽  
Antolino Gallego ◽  
Francisco Sagasta ◽  
Amadeo Benavent-Climent
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Concrete Slab ◽  
B Value ◽  
Reinforced Concrete Slab

scholarly journals Structural condition assessment of reinforced-concrete bridges based on acoustic emission and strain measurements

2020 ◽  
Vol 10 (5) ◽  
pp. 1037-1055
Author(s):  
Imane Bayane ◽  
Eugen Brühwiler
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Concrete Slab ◽  
Structural Condition ◽  
Concrete Bridges ◽  
Reinforced Concrete Slab ◽  
Value Analysis ◽  
Operational Conditions ◽  
Emission Activity ◽  
Structural Condition Assessment

Abstract A reliable novel monitoring approach is developed to assess the structural condition of reinforced-concrete bridge elements. The approach is based on combining acoustic emission technique and strain gauge measurements, and it is illustrated by a case study of a composite steel–concrete viaduct in service since 1957. Monitoring was performed on its reinforced-concrete deck slab under traffic and environmental loading for one year. The monitoring setup and procedure are presented. The variation of acoustic emission signals is evaluated regarding strain and temperature measurements. Parametric study, pencil-break test, statistical analysis, crack classification and b-value analysis are performed to assess the structural condition. The acoustic emission activity of the reinforced-concrete slab is evaluated for 1 year under operational conditions. From the monitoring approach, it was possible to identify the nature of the cracking activity in the concrete slab as a function of traffic loading and temperature and to assess in time the condition of the slab-girder connection.

scholarly journals Proposition of Thin-Layer Repairing Methods Using Low-Elasticity Polymer Portland Cement Materials and Glue and Study on the Fatigue Resistance of Reinforced Concrete Slab

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Tadashi Abe ◽  
Kiyoshi Ito ◽  
Noriyuki Kozakai ◽  
Takayoshi Kodama
Keyword(s):  
Fatigue Resistance ◽  
Concrete Slab ◽  
Wheel Load ◽  
Reinforced Concrete Slab ◽  
Repair Method ◽  
High Durability ◽  
Rc Slabs ◽  
Reinforcement Measures ◽  
Repair Cycle

In this repair method, two types of adhesives, such as a penetrable adhesive and a high-durability adhesive, were applied to the adhesion interface of the materials to be repaired, and then cast. The repair method was then evaluated for fatigue resistance using wheel load running tests. It was developed to ensure the long-term integrity of the repair material and RC slabs. The results of the experiments confirmed that this repair method provides significantly better fatigue resistance than the conventional construction method. Moreover, this study proposes two wet repair cycles and one dry repair cycle with reinforcement measures to improve the load-bearing performance.

INFLUENCE OF RAILING STIFFNESS ON WHEEL LOAD DISTRIBUTION IN TWO-SPAN CONCRETE SLAB BRIDGES

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Sarah Jaber ◽  
Mounir Mabsout ◽  
Kassim Tarhini
Keyword(s):  
Load Distribution ◽  
Concrete Slab ◽  
Wheel Load ◽  
Reinforced Concrete Slab ◽  
Element Analysis ◽  
Analysis And Design ◽  
Design Procedures ◽  
State Highway ◽  
Load Carrying ◽  
Longitudinal Bending

The American Association of State Highway and Transportation Officials (AASHTO) Standard Specifications or LRFD do not account for the presence of railings in the analysis and design of concrete slab bridges. This paper presents a parametric investigation of the influence of railing stiffness on the wheel load distribution in simply-supported, two-equal-span, and one-and two-lane reinforced concrete slab bridges using the finite-element analysis (FEA). A total of 160 bridge cases were modeled and bridge parameters such as span lengths and slab widths were varied within practical ranges. Various railing stiffness were investigated by assuming railings built integrally with the bridge deck and placed on both edges of the bridge. The FEA wheel load distribution and longitudinal bending moments were compared with reference bridge slabs without railings as well as to the AASHTO design procedures. Accordingly, the presence of railings reduced the FEA negative moments by a range of 54% to 72% and the FEA positive moments by a range of 40% to 61% depending on the railing stiffness. This reduction in slab moments due to the presence of railings could be considered an increase in the bridges load carrying capacity. The results of this investigation will assist bridge engineers in better designing and/or evaluating concrete slab bridges in the presence of railings. This could also be considered an alternative for strengthening existing concrete slab bridges.

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