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Collapse assessment of a steel frame with high postyield stiffness stainless steel devices in Abaqus

Baiguera, M; Vasdravellis, G; Karavasilis, TL; (2018) Collapse assessment of a steel frame with high postyield stiffness stainless steel devices in Abaqus. In: 16th European Conference on Earthquake Engineering (16ECEE) Proceedings. 16ECEE: Thessaloniki, Greece. Green open access

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Abstract

The collapse resistance of a dual seismic-resistant steel frame with high post-yield stiffness stainless steel devices is evaluated. The dual system consists of a moment-resisting frame equipped with dissipative concentric braces. The dissipative braces are realised as the in-series connection of stainless steel pins (SSPs) with a hourglass shape, conventional steel braces, and friction pads. The latter are activated only under very large seismic intensities to control the peak force of the braces. Moreover, replaceable ductile fuses are used in the beams at the expected locations of plastic hinges. Incremental dynamic analyses are performed using an advanced finite element model in Abaqus that simulates geometric and material nonlinearities including ductile fracture in the SSPs. The cyclic behaviour of the SSPs is experimentally evaluated by testing two full-scale specimens in a configuration reproducing their actual connection details in the steel frame. The results of fourteen cyclic tests show that the SSPs have stable symmetric hysteresis, high post-yield stiffness, and large energy dissipation and fracture capacities. Ductile fracture in SSPs is modelled using a plastic motion-based criterion that is calibrated against the experimental results. The results of incremental dynamic analyses show that the proposed system has superior resistance against seismic collapse, with a 1.2% collapse probability under the maximum-considered earthquake. The large collapse capacity is due to the high post-yield stiffness and the excellent fracture capacity of the SSPs. In particular, fracture is detected only under two long duration earthquakes scaled to intensities higher than that of the maximum considered earthquake.

Type: Proceedings paper
Title: Collapse assessment of a steel frame with high postyield stiffness stainless steel devices in Abaqus
Event: 16th European Conference on Earthquake Engineering (16ECEE)
Location: Thessaloniki, Greece
Dates: 18-21 June 2018.
Open access status: An open access version is available from UCL Discovery
Publisher version: http://www.16ecee.org/
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Seismic collapse; Stainless steel seismic device; Energy dissipative brace; Ductile fracture.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10079179
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