| Title |
Structural Performance of the Modular System with Fully RestrainedMoment Connections using Ceiling Bracket |
| Authors |
Lee, Seung-Jae ; Kwak, Eui-Shin ; Park, Jae-Seong ; Kang, Chang-Hoon ; Shon, Su-Deok |
| DOI |
https://doi.org/10.5659/JAIK_SC.2017.33.12.37 |
| Keywords |
Modular system ; Fully restrained moment connection ; Structural performance ; Cyclic loading test ; Ceiling bracket ; Haunch |
| Abstract |
Due to structural characteristics, construction costs and duration of a modular system would be saved by minimizing the schedule on the job site. As such, it is crucial to develop a connection that can guarantee stiffness while allowing for simple assembling. Particularly, the mid- to high-rise construction of the modular system necessitates the securing of the structural stability and seismic performance of multi-unit frames and connections, and thus, the stiffness of unit-assembled structures needs to be re-evaluated and designed. However, evaluating a frame consisting of slender members and reinforcing materials is a complicated process. Therefore, the present study aims to examine the structural characteristics of a modular unit connection based a method for reinforcing connection brackets and hinges while minimizing the loss of the cross section. Toward this end, the study modeled the beam-to-column connection of a modular system with the proposed connection, and produced a specimen which was used to perform a cycling loading test. The study compared the initial stiffness, the attributes of the hysteretic behavior, and the maximum flexural moment, and observed whether the model acquired the seismic performance, compared to the flexural strength of the steel moment frame connection that is required by the Korean Building Code. The test results showed that the proposed connection produced a similar initial stiffness value to that of the theoretical equation, and its maximum strength exceeded the theoretical strength. Furthermore, the model with a larger ceiling bracket showed higher seismic performance, which was further increased by the reinforcement of the plate. |