Damage modeling of kaiser effect on reinforced concrete beam under cyclic load using ultrasonic pulses/ Nylle Jericho P. Bague, Jan Gabriel P. Dupaya, Jan Manuel Bien E. Laureano, Naeden Zen P. Maranan, Aaron Vincent L. Onal, and Marvin Angelo A. Pagente .--

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Bague, Nylle Jericho P [author ]

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TextPublication details: Manila: Technological University of the Philippines, 2023.Description: xiii, 192pages: 29cm. +1 CD-ROM (4 3/4in.)Content type:

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BTH TA 145 B34 2023

Dissertation note: College of Engineering.-- Bachelor of Science in Civil Engineering: Technological University of the Philippines, 2023. Summary: The widespread application of concrete in the Philippines has raised the demand for non-destructive evaluation (NDE) techniques for an effective assessment of the structure's health without causing damage. The ultrasonic pulse velocity (UPV) test stands out among various NDE procedures because of its versatility in the in-situ application and its relatively low cost. Unfortunately, despite UPV's positive results, its reliance on the type of applied stress is often neglected. Additionally, In the case of non-destructive testing on concrete materials, there is an occurrence known as Kaiser effect phenomena, which has a practical use to detect crack propagation under different loading conditions. This research follows an approach that focuses on developing damage models using ultrasonic pulses to study the Kaiser Effect phenomenon on concrete structures. The damage models are graphs showing the relation between the damage parameter and applied stress induced by the 3- point flexural strength test until reinforced concrete beam failure. The results showed that the amount of steel reinforcement affects the scalar damage accumulation at early stages of loading. The position of transducers affects the reliability of detecting damage. The concrete strength affects the scalar damage accumulation that occurs on higher stress levels. It was established in this study that there is an obvious occurrence of additional damage on the RC beam when the previous maximum applied load has been exceeded along the cyclic loading procedure. Ultimately, this study concluded that the Kaiser effect is valid on concrete structures under cyclic loads and can be used to effectively evaluate damages.

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Thesis (undergraduate)

College of Engineering.-- Bachelor of Science in Civil Engineering: Technological University of the Philippines, 2023.

Includes bibliography:

The widespread application of concrete in the Philippines has raised the demand
for non-destructive evaluation (NDE) techniques for an effective assessment of the
structure's health without causing damage. The ultrasonic pulse velocity (UPV) test stands
out among various NDE procedures because of its versatility in the in-situ application and
its relatively low cost. Unfortunately, despite UPV's positive results, its reliance on the type
of applied stress is often neglected. Additionally, In the case of non-destructive testing on
concrete materials, there is an occurrence known as Kaiser effect phenomena, which has a
practical use to detect crack propagation under different loading conditions. This research
follows an approach that focuses on developing damage models using ultrasonic pulses to
study the Kaiser Effect phenomenon on concrete structures. The damage models are graphs
showing the relation between the damage parameter and applied stress induced by the 3-
point flexural strength test until reinforced concrete beam failure. The results showed that
the amount of steel reinforcement affects the scalar damage accumulation at early stages
of loading. The position of transducers affects the reliability of detecting damage. The
concrete strength affects the scalar damage accumulation that occurs on higher stress
levels. It was established in this study that there is an obvious occurrence of additional
damage on the RC beam when the previous maximum applied load has been exceeded
along the cyclic loading procedure. Ultimately, this study concluded that the Kaiser effect
is valid on concrete structures under cyclic loads and can be used to effectively evaluate
damages.

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