Felix Clauß

Thermo-Mechanical Investigations of Reinforced Concrete Structures Using Coda Wave Interferometry


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ISBN:

978-3-8440-8698-0

Series:

Schriftenreihe des Instituts für Konstruktiven Ingenieurbau
Herausgeber: Prof. Dr.-Ing. R. Breitenbücher, Prof. Dr.-Ing. Rüdiger Höffer, Univ.-Prof. Dr. Markus Knobloch, Univ.-Prof. Dr.-Ing. habil. Peter Mark and Prof. Dr.-Ing. Markus Thewes
Bochum

Volume:

2022,2

Keywords:

Codawellen; Korrelation; Dehnung; Relative Geschwindigkeitsänderung; Thermomechanisch; Momenten-Krümmungsbeziehungen; Structural Health Monitoring; Stahlbeton;

Type of publication:

Thesis

Language:

English

Pages:

224 pages

Figures:

125 figures

Weight:

332 g

Format:

21 x 14,8 cm

Binding:

Paperback

Price:

49,80 € / 62,30 SFr

Published:

August 2022

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Abstract:

Civil engineering structures are aging. Ultrasonic coda waves offer an auspicious opportunity to monitor this deterioration. Current approaches with coda wave-based monitoring of concrete (structures) focus on specimens that are only a few centimeters small or on detecting cracks in reinforced concrete. The empirical model introduced in this thesis enables evaluating the load-bearing capacity of reinforced concrete structures subjected to bending using coda waves. The model involves the complex material behavior of reinforced concrete, from the linear-elastic range to the range of cracking and completed cracking.

The underlying methodology is based on mechanical, thermal, and thermo-mechanical experiments on reinforced concrete beams. Ultrasonic measurements are evaluated using coda wave interferometry. This method yields the relative velocity change. The strain of the component is used as a reference. Investigations into the application, assembly and accuracy of strain measurement techniques reveal fiber optics as a suitable technique.

The relative velocity change is correlated with the measured strain. The idea is based on the volume-like collection of influences by coda waves. The correlation of the two respective quantities (relative velocity change and average steel strain) exhibits a linear relationship. This gives a first-order approach. Using this approach, the strain of the beam can be accurately calculated via the relative velocity change. Statistically, the model is of high quality (R^2 = 0.99) and low error (RMSE = 0.09 ‰).

Consequently, it becomes feasible to monitor reinforced concrete structures by means of ultrasonic measurements and to accurately indicate the load-bearing capacity even under progressive cracking.