Youngjae Choi

ORCID Identifier(s)


Graduation Semester and Year




Document Type


Degree Name

Doctor of Philosophy in Civil Engineering


Civil Engineering

First Advisor

Shih-Ho Caho


The work presented in this dissertation is divided into two parts. Each part has drawn its own results. Reinforced concrete (RC) buildings resist a strong earthquake through structural foundations, diaphragms, and vertical elements. Moment-resisting frames and shear walls are primary-used vertical elements in RC buildings. The moment-resisting frames consist of columns, beams that frame into the column and beam column joints where the columns and beams meet. A key point of designing the moment-resisting frames against a strong earthquake is to ensure beam-column connections to dissipate as much energy possible. The shear wall often becomes two separate slender cantilever walls due to the requirement for openings over its height. It is the coupling beams that connect these two walls to act as a single wall. This system is called coupled wall. A key point of designing the coupled wall is to assure the coupling beams to resist large rotations, maintaining their strength and stiffness. For the past decades, there has been remarkable achievement on improving the seismic performance of those vertical elements. Although it seems their performance against a strong earthquake is in a safe zone, there have been issues that are related to their construction. Both elements are often found to be very difficult to construct due to either steel reinforcement congestions or difficult steel reinforcement details. The research presented in this dissertation is results of attempts to make their construction much practicable by using either different materials or different steel reinforcement details.


Coupling beams, RC slab-beam-column-connection, HPFRC


Civil and Environmental Engineering | Civil Engineering | Engineering


Degree granted by The University of Texas at Arlington