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

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.

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

Strain monitoring in a reinforced concrete slab sustaining service loads by distributed Brillouin fibre optic sensors

2010 ◽  
Vol 37 (10) ◽  
pp. 1341-1349 ◽  
Author(s):  
Beatriz Martín-Pérez ◽  
Amre Deif ◽  
Bruno Cousin ◽  
Chunshu Zhang ◽  
Xiaoyi Bao ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Fibre Length ◽  
Experimental Program ◽  
Small Scale ◽  
Fibre Optic ◽  
Reinforced Concrete Slab ◽  
Rc Structures ◽  
Strain Monitoring ◽  
Rc Slab

Reinforced concrete (RC) structures deteriorate and as a result crack due to extreme loading and (or) environmental conditions. Damage accumulation as such adversely affects the structure’s durability properties, impairing its service life. The intensity of cracking in an RC structure is usually regarded as the key criterion toward damage assessment and repair intervention. This paper presents the results of an experimental program in which the concrete strains of a small-scale RC slab sustaining in-service loads were monitored by traditional electrical strain gauges and distributed Brillouin fibre optic sensors in an attempt to detect damage due to crack formation. A comparison of these measurements with classical bending theory is also presented. The results show that distributed Brillouin fibre optic sensors can capture both tensile and compressive strains in concrete; however, the accuracy of their measurements is dependent on the proper installation of the sensors and the fibre length over which the strains are to be measured.

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.

Evaluation and comparison of concrete constitutive models in numerical simulation of reinforced concrete slabs under blast load

2021 ◽  
pp. 204141962110489
Author(s):  
Hani Mahdavi Talaromi ◽  
Farhad Sakhaee
Keyword(s):  
Reinforced Concrete ◽  
Numerical Models ◽  
Concrete Slab ◽  
Constitutive Models ◽  
Computation Time ◽  
Material Model ◽  
Reinforced Concrete Slab ◽  
Rc Structures ◽  
Reinforced Concrete Slabs ◽  
Concrete Damage

Numerical models have been used recently to analyze concrete structures subjected to high-impulsive loads. A material model that can well capture the mechanical behaviors is crucial to obtain reliable results. Present study, focused on reinforced concrete slab as a major load carrying element of the RC structures under blast loading. By performing several simulations in popular and powerful concrete constitutive models, including concrete damage R3, HJC, CSCM, and Winfrith the accuracy of these models was investigated. Maximum deflections have been compared with each other and expanded further to compare with experiments. Result showed all models have an acceptable accuracy in estimating maximum slab deflection. Concrete Damage R3 presented the highest accuracy. HJC has the second rank and CSCM and Winfrith have the third and the fourth places, respectively. HJC needed the minimum computation time. CSCM had minimum input parameters but includes maximum calculation time. Winfrith had the lowest accuracy, however this model presented very conservative results. Uniaxial compressive and tensile stress-strain curves showed that the models which presented higher values of strength, evaluated lower maximum values of deflection.

Dimension and Frequency Profiles of Concrete Highway Bridges in New Madrid Region of Southeastern Missouri

1997 ◽  
Vol 1594 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Ralph Alan Dusseau
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Highway Bridges ◽  
Ambient Vibration ◽  
Earthquake Hazards ◽  
Empirical Formulas ◽  
Reinforced Concrete Slab ◽  
Box Girder ◽  
Bridge Spans ◽  
New Madrid

The results of a study funded by the U.S. Geological Survey as part of the National Earthquake Hazards Reduction Program are presented. The first objective of this study was the development of a database for all 211 highway bridges along I-55 in the New Madrid region of southeastern Missouri. Profiles for five key dimension parameters (which are stored in the database) were developed, and the results for concrete highway bridges are presented. The second objective was to perform field ambient vibration analyses on 25 typical highway bridge spans along the I-55 corridor to determine the fundamental vertical and lateral frequencies of the bridge spans measured. These 25 spans included six reinforced concrete slab spans and two reinforced concrete box-girder spans. The third objective was to use these bridge frequency results in conjunction with the dimension parameters stored in the database to develop empirical formulas for estimating bridge fundamental natural frequencies. These formulas were applied to all 211 Interstate highway bridges in southeastern Missouri. Profiles for both fundamental vertical and lateral frequencies were then developed, and the results for concrete highway bridges are presented.

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