Hysteresis performance of through bolted connections in CFST frame
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ORIGINAL PAPER
Hysteresis performance of through bolted connections in CFST frame K. P. Beena1 · M. S. Ajith1 · S. Sheela2 Received: 6 February 2020 / Accepted: 8 July 2020 © Springer Nature Switzerland AG 2020
Abstract This paper presents an experimental study on the seismic performance of composite structural frame systems consisting of concrete-filled steel tubes (CFSTs) and steel beams. The modified, extended end-plate connections were fabricated by straight through bolt for square columns and split bolt for the circular column with a curved endplate. Half-scale CFST composite moment resisting frames were tested under displacement-controlled quasi-static lateral cyclic load. Circular CFST columns possess better confinement than square CFST columns, but the application in construction is restricted due to the difficulty in joining with the steel beams. The present study investigates the strength, stiffness degradation, ductility, failure mode, and energy dissipation characteristics corresponding to the inter-story drift. The results from the tests indicate that the seismic resistance is at par with the American Institute of Steel Construction (AISC) seismic recommendations for composite special moment-resisting frame, and hence the split-bolt assembly can be used as an effective alternate for connection in circular columns. This work also tries to impart the experimental database on the effect of increasing the number of the bay in the resisting direction. Single-bay and double-bay frames were compared to quantify the improvement in seismic performance. Keywords CFST frame · Through bolt · Curved end plate · Lateral cyclic loading
Introduction Concrete-filled steel tube (CFST) is a promising technology for high-rise structures in order to satisfy the demand for seismic strength and pace of construction. In CFST, steel is positioned continuously on the outer periphery of concrete core. This helps both materials to complement each other to improve the stiffness and strength by confinement and lateral restraints (Shanmugam and Lakshmi 2001). These characteristics make CFST a better option for high rise structures in seismic regions, compared to regular RCC
* K. P. Beena [email protected]; [email protected] http://ce.cet.ac.in/beenakp.php M. S. Ajith [email protected]
S. Sheela [email protected]; [email protected]
1
Structural Engineering Division, Department of Civil Engineering, College of Engineering Trivandrum, Thiruvananthapuram, Kerala 695016, India
Mohandas College of Engineering, Trivandrum, Kerala 695541, India
2
structures. The application of CFST is limited mainly due to the shortage of design guidelines and lack of understanding of the complexities in the connection between CFST column and structural steel beams. A proper understanding of joint response is essential to avoid connection failure (Galambos 2000; He et al. 2013). For frames, strength hierarchy needs to be maintained in such a way that under seismic action, the ductility of components is utilized to m
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