Structural damage evaluation of industrial masonry chimneys

New Super-High-Density (SHD) olive orchards designed for mechanical harvesting are increasing very rapidly in Spain. Most studies have focused in effectively removing the olive fruit, however the machine needs to put significant amount of energy on the canopy that could result in structural damage or extra stress on the trees. During harvest, a series of 3-axis accelerometers were installed on the tree structure in order to register vibration patterns. A LiDAR (Light Detection and Ranging) and a camera sensing device were also mounted on a tractor. Before and after harvest measurements showed significant differences in the LiDAR and image data. A fast estimate of the damage produced by an over-the-row harvester with contactless sensing could be useful information for adjusting the machine parameters in each olive grove automatically in the future.

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Temperature effect on electromechanical admittance–based concrete structural health monitoring

Structural Health Monitoring ◽

10.1177/1475921719860397 ◽

2019 ◽

Vol 19 (3) ◽

pp. 661-692 ◽

Cited By ~ 3

Author(s):

Demi Ai ◽

Chengxing Lin ◽

Hui Luo ◽

Hongping Zhu

Keyword(s):

Numerical Analysis ◽

Structural Health Monitoring ◽

Damage Detection ◽

Temperature Effect ◽

Health Monitoring ◽

Structural Damage ◽

Shield Tunnel ◽

Engineering Practice ◽

Damage Evaluation ◽

Structural Health

Concrete structures in service are often subjected to environmental/operational temperature effects, which change their inherent properties and also inflict a challenge to their extrinsic monitoring systems. Recently, piezoelectric lead zirconate titanate (PZT)-based electromechanical admittance technique has been increasingly growing into an effective tool for concrete structural health monitoring; however, uncertainty in the changes of monitoring signals induced by temperature impact on concrete/PZT sensor would inevitably cause interference to structural damage detection, which adversely hinder its application from laboratory to engineering practice. This article, aiming at exploring the temperature effect on the electromechanical admittance–based concrete damage evaluation, primarily covered a series of theoretical/numerical analysis with rigorously experimental verifications. Three aspects of comparative studies were performed in theoretical/numerical analysis: (1) thermal-dependent parameters were inclusively evaluated in contribution to the electromechanical admittance characteristics via PZT-structure interaction models; (2) three-dimensional finite element analysis in multi-physics coupled field was employed to qualitatively assess the singular temperature effect on the electromechanical admittance behaviors of free-vibrated PZT, surface-bonded PZT/inside-embedded PZT coupled healthy concrete cubes; and (3) depending on the modeling of surface-bonded PZT-/inside-embedded PZT-cracked concrete cube, thermal effect on damage evaluation was addressed via quantification on the electromechanical admittance variations. In the experimental study, rigorous validation tests were carried out on a group of lab-scale concrete cubes, where surface-bonded PZT/inside-embedded PZT transducers were simultaneously employed for electromechanical admittance monitoring in view of thermal difference between concrete surface and its inner part. Correlation coefficient deviation value-based effective frequency shifts algorithm was also employed to compensate the temperature effect. Moreover, temperature effect was further testified on the monitoring of a full-scale shield-tunnel segment structure. Experimental results indicated that temperature triggered different behaviors of electromechanical admittance signatures for surface-bonded PZT/inside-embedded PZT transducers and contaminated the electromechanical admittance responses for damage detection. Structural damage severity level can be disadvantageously amplified by temperature increment even if under the same damage scenarios.

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Practical Method for Damage Evaluation Based on Point Estimate Considering Uncertainty of Structural Properties

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.802.255 ◽

2015 ◽

Vol 802 ◽

pp. 255-260

Author(s):

Kahori Iiyama ◽

Masataka Hoso ◽

Takanori Ishida ◽

Kohei Fujita ◽

Yoshihiro Yamazaki ◽

...

Keyword(s):

Structural Properties ◽

Model Uncertainty ◽

Structural Damage ◽

Large Scale ◽

Practical Method ◽

Point Estimate ◽

Damage Evaluation ◽

Building Structures ◽

Large Scale Simulation ◽

Seismic Simulation

This study introduces a practical method for evaluating structural damage based on a large-scale simulation targeting expansive areas, like whole cities. In such a seismic simulation that deals with numerous building structures, it is desirable to estimate the damage based on a stochastic evaluation considering the uncertainty of structural properties. This is because an accurate modeling of numerous building structures, according to each designed value, would require a great deal of time. However, a damage evaluation considering the model uncertainty generally involves numerous calculations and is inadequate for such a large-scale simulation. Therefore, we propose a method using the point estimate technique which can estimate the probability of damage under model uncertainty from a small number of calculations. The applicability and usefulness of the proposed method is evaluated by comparing it to the method based on a Monte Carlo simulation.

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Post-quake structural damage evaluation by neural networks: theory and calibration

European Journal of Environmental and Civil engineering ◽

10.1080/19648189.2017.1304277 ◽

2017 ◽

Vol 23 (6) ◽

pp. 710-727 ◽

Cited By ~ 4

Author(s):

Hichem Noura ◽

Ahmed Mebarki ◽

Mohamed Abed

Keyword(s):

Neural Networks ◽

Structural Damage ◽

Damage Evaluation

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Structural damage evaluation of natural building stones: Potential and limitations of ultrasonic diagnostics

Zeitschrift der Deutschen Geologischen Gesellschaft ◽

10.1127/zdgg/150/1999/359 ◽

1999 ◽

Vol 150 (2) ◽

pp. 359-374 ◽

Cited By ~ 2

Author(s):

Helmut Dürrast ◽

Siegfried Siegesmund ◽

Manika Prasad

Keyword(s):

Structural Damage ◽

Damage Evaluation ◽

Building Stones ◽

Ultrasonic Diagnostics ◽

Natural Building Stones ◽

Natural Building

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Seismicity of East Anatolian of Turkey and Failures of Infill Walls Induced by Major Earthquakes

Journal of Earthquake and Tsunami ◽

10.1142/s1793431121500172 ◽

2021 ◽

pp. 2150017

Author(s):

Adem Doğangün ◽

Burak Yön ◽

Onur Onat ◽

Mehmet Emin Öncü ◽

Serkan Sağıroğlu

Keyword(s):

Structural Damage ◽

Fault Zones ◽

Eastern Region ◽

Damage Evaluation ◽

Infill Wall ◽

Infill Walls ◽

Out Of Plane ◽

Major Fault ◽

Van Earthquakes ◽

In The Beginning

There are three major fault zones in Turkey scattered around the country known as East Anatolian Fault (EAF), North Anatolian Fault (NAF) and Anatolian-Aegean Subduction Zone (AASZ). Last two decades, EAF has been rather quiescent compared with NAF. However, this quiescence was broken in the beginning of the millennium. The strong shaking was started in 2003 with Bingöl earthquake (Mw = 6.3) and the last earthquake on the EAF is the Sivrice-Elazığ (Mw = 6.8) on January 24, 2020. Strong seismicity of these faults damaged the structures severely and caused death of the habitants. This study aims to present, seismotectonic of the region, general characteristics of the earthquakes and more specifically to report structural damage of infill walls of the structure’s damages caused by these earthquakes. Damage evaluation and identification of the observed infill wall damages due to 2003 Bingöl, 2011 Van earthquakes and January 24, 2020 Sivrice-Elazığ earthquake occurred Turkey’s Eastern region, were presented, and possible solutions were suggested. Moreover, the effects of the infill walls on the behavior of structures under static and dynamic load cases are discussed that experienced in these earthquakes. Damages are classified according to formations such as in-plane or out-of-plane, evaluations and the results obtained from the discussions are presented for each category.

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