Abstract
This paper proposes a new kind of U-type reinforcement ferrule (URF) connection for the assembly of precast concrete (PC) components, which has a good fault-tolerance ability and low cost of construction with a simple post-grouting process. The modified connection features welded U ferrules, which can increase the bonding mechanism and internal stress transmission in the spliced region. A series of quasi-static cyclic tests were performed on URF-connected PC columns with different welding patterns. Comprehensive comparisons were performed on the load-bearing capacity, the plastic energy dissipation ability, the internal force transmission, the column ductility and the stiffness. The results indicated that PC columns with welded URF connections can ensure better lateral resistance than the cast-in-place concrete column. The weld type and length influence the connection performance, and the 15d-welded and full-length welded URF connections presented better connection performance and were suggested for the assembly of PC columns. Then, finite element analyses were performed to further reveal the working and failure mechanisms and the affecting mechanism of some working parameters. Parametric simulations indicated that the increase in the axial load ratio and the concrete strength in the postcast region had a slight but limited effect on improving the lateral resistance of the column connection.
Highlights
Due to the advantages of high construction efficiency, low environmental pollution and flexible space arrangement, precast concrete (PC) structures have received considerable attention and have been widely adopted in structural engineering (Elliott 2016)
3.1 Failure Modes The tested specimens all displayed a failure pattern that was similar to the small eccentric compression failure of the reinforced concrete column
The results indicated that the sleeve connection could present strong bonding between the spliced longitudinal reinforcements, leading to the high lateral strength and stiffness of the assembled column
Summary
Due to the advantages of high construction efficiency, low environmental pollution and flexible space arrangement, precast concrete (PC) structures have received considerable attention and have been widely adopted in structural engineering (Elliott 2016). Unlike traditional cast-inplace (CIP) concrete structures, PC structures have concrete elements prefabricated in a factory These precast columns and beams are connected on site with only a small amount of concrete casting or grouting work. The results indicated that the grouted sleeves could ensure similar ductility and energy dissipation capacity of the structural members. Test results showed that the proposed construction method can effectively transfer the internal stress and can ensure the ductility and energy dissipation ability of the precast columns. Sayadi et al (2014, 2015) studied the bonding behavior of spliced sleeves located in the elastic and inelastic segments of the splice sleeves through bending tests on the assembled beams. It was found that providing an interlock mechanism in the elastic segment of the sleeve would decrease the bond strength of the spliced sleeves and the load-carrying capacity of the beam
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Concrete Structures and Materials
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
