Abstract
The effective retrofit strategy of non-seismic designed structures is required to improve the strength and ductility. Jacketing is the most typical method which can enhance seismic resistance capacity, but there are many disadvantages due to its enlarged jacket section. This study developed a non-welded concrete-filled steel tube system (NoWS) which was installed using bolts in the form of tube-type steel-encased beams and columns; the NoWS could increase the capacity of seismic resistance strength and the ductility of members. One reinforced concrete (RC) frame specimen with non-seismic details and one NoWS were manufactured, and cyclic loading tests were conducted until critical failure was observed in the column after reaching maximum load. As experimental results, the specimen retrofitted with NoWS had excellent seismic performance, showing resistance to lateral load, effective stiffnesses, and energy dissipation capacity approximately 2–3 times greater than the results of an RC frame specimen.
Highlights
IntroductionJacketing is the most typical retrofitting method for reinforced concrete (RC) structural members, and it involves either concrete jacketing, steel jacketing, attaching a fiber-reinforced polymer (FRP) or a method using concrete-filled steel tubes (CFSTs)
Steel jacketing is a method of welding steel plates or steel tubes to existing members and grouting the gap between the steel jacket and the reinforced concrete (RC) members with mortar
To resist torsion caused by lateral load, a ball jig was set in apply in of the direction, a jig with a steel rod was to the load theload middle thenegative column
Summary
Jacketing is the most typical retrofitting method for RC structural members, and it involves either concrete jacketing, steel jacketing, attaching a fiber-reinforced polymer (FRP) or a method using concrete-filled steel tubes (CFSTs). The disadvantages of concrete jacketing are the integration between the existing members and the added jacket, the need for additional rebars to ensure total integration, and the need for drilling on beams. It reduces the available space by increasing the size of the members, and increases the overall cost of construction due to the limited use of the structure during the construction period.
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