Optimization of Reduced Beam Section Moment Connections
thesis
posted on 2023-04-17, 19:55 authored by Morayo Oluwaseun LawalReduced beam section (RBS) moment connections also referred to as Dog-bone connections
are commonly used in seismic resistant steel moment frames. In RBS connections, the top and
bottom flanges of the steel beam are selectively trimmed in the area adjacent to the beam to
column connection. This is to ensure that under seismic loading, plastic hinges are formed in
the beam not in the column.
The purpose of this study is to optimize the cyclic responses of RBS moment connections
including those with sloping beams. Using a response surface method, predictive equations are
developed for the response characteristics, such as initial stiffness, plastic strain index, moment capacity, hysteretic energy dissipation, and strength degradation rate. The optimization studies
consider objectives leading to higher stiffness, lower plastic strain index, maximum moment
capacity, higher hysteresis energy dissipation and lower strength degradation. The optimization
results obtained shows that beam slope angle greater than 27.8° will experience fracture, high
inelastic demand with higher strength degradation and more intense buckling.
History
Language
EnglishDegree
- Master of Engineering
Program
- Civil Engineering
Granting Institution
Ryerson UniversityLAC Thesis Type
- Thesis Project
