Seismic design, modelling and assessment of self-centering steel frames using post-tensioned connections with web hourgl
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Seismic design, modelling and assessment of self-centering steel frames using post-tensioned connections with web hourglass shape pins Athanasios I. Dimopoulos · Theodore L. Karavasilis · George Vasdravellis · Brian Uy
Received: 10 December 2012 / Accepted: 17 February 2013 © Springer Science+Business Media Dordrecht 2013
Abstract A new self-centering steel post-tensioned connection using web hourglass shape pins (WHPs) has been recently developed and experimentally validated. The connection isolates inelastic deformations in WHPs, avoids damage in other connection parts as well as in beams and columns, and eliminates residual drifts. WHPs do not interfere with the composite slab and can be very easily replaced without bolting or welding, and so, the connection enables non-disruptive repair and rapid return to building occupancy in the aftermath of a strong earthquake. This paper presents a simplified nonlinear model for the connection and the associated beams and columns that consists of nonlinear beam-column elements, and hysteretic and contact zero-length spring elements appropriately placed in the beam-column interface. The model was calibrated against experimental results and found to accurately simulate the connection behaviour. A prototype building was selected and designed as a conventional steel moment-resisting frame (MRF) according to Eurocode 8 or as a selfcentering steel MRF (SC-MRF) using the connection with WHPs. Seismic analyses results show that the conventional MRF and the SC-MRF have comparable peak storey drifts, and highlight the inherent potential of the SC-MRF to eliminate damage in beams and residual drifts. The paper also shows that repair of damage in the conventional MRF will be costly and disruptive after the design basis earthquake, and, not financially viable after the maximum considered earthquake due to large residual drifts. Keywords Self-centering · Post-tensioned · Seismic design · Steel connection · Steel MRFs
A. I. Dimopoulos · T. L. Karavasilis (B) School of Engineering, University of Warwick, Coventry CV4 7AL, UK e-mail: [email protected] G. Vasdravellis · B. Uy Institute for Infrastructure Engineering, University of Western Sydney, Penrith, Sydney, NSW 2751, Australia
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Bull Earthquake Eng
1 Introduction Conventional ductile steel moment-resisting frames (MRFs) are currently designed to form a global plastic mechanism under strong earthquakes by developing plastic hinges at the ends of the beams and at the base of the columns (EC8 2009). This design approach results in softening force-drift behaviour, and so, has many advantages including reduced member forces and low base shear force. However, plastic hinges in structural members involve cyclic inelastic deformations and local buckling which result in difficult to inspect and repair damage as well as residual drifts. The socio-economic losses related to damage and residual drifts are repair costs, loss of building occupation and business interruption, and possibly building demolition due to the complicatio
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