Bague, Nylle Jericho P.  <br/><br/>
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 .-- 
 - Manila:  Technological University of the Philippines,   2023. 
 - xiii, 192pages:   29cm.   +1 CD-ROM (4 3/4in.)  
<br/><br/> Thesis (undergraduate)  
<br/><br/>College of Engineering.-- 
<br/><br/>Includes bibliography:  
<br/><br/> The widespread application of concrete in the Philippines has raised the demand<br/>for non-destructive evaluation (NDE) techniques for an effective assessment of the<br/>structure's health without causing damage. The ultrasonic pulse velocity (UPV) test stands<br/>out among various NDE procedures because of its versatility in the in-situ application and<br/>its relatively low cost. Unfortunately, despite UPV's positive results, its reliance on the type<br/>of applied stress is often neglected. Additionally, In the case of non-destructive testing on<br/>concrete materials, there is an occurrence known as Kaiser effect phenomena, which has a<br/>practical use to detect crack propagation under different loading conditions. This research<br/>follows an approach that focuses on developing damage models using ultrasonic pulses to<br/>study the Kaiser Effect phenomenon on concrete structures. The damage models are graphs<br/>showing the relation between the damage parameter and applied stress induced by the 3-<br/>point flexural strength test until reinforced concrete beam failure. The results showed that<br/>the amount of steel reinforcement affects the scalar damage accumulation at early stages<br/>of loading. The position of transducers affects the reliability of detecting damage. The<br/>concrete strength affects the scalar damage accumulation that occurs on higher stress<br/>levels. It was established in this study that there is an obvious occurrence of additional<br/>damage on the RC beam when the previous maximum applied load has been exceeded<br/>along the cyclic loading procedure. Ultimately, this study concluded that the Kaiser effect<br/>is valid on concrete structures under cyclic loads and can be used to effectively evaluate<br/>damages. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Infrastructure<br/>Concrete beam 
<br/><br/><label>LC Class. No.: </label>BTH TA 145  / B34 2023