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Damage-avoidance steel rocking frames with buckling-enabled composite bracing

Damage-avoidance steel rocking frames with buckling-enabled composite bracing
Damage-avoidance steel rocking frames with buckling-enabled composite bracing

The severe social and economic impacts of recent earthquakes have inspired a growing interest in smart structural systems that offer immediate post-disaster occupancy. Post-tensioned rocking frames are emerging damage-avoiding seismic-resistant structures that employ rocking joints at member connections (to avoid major damage to primary structural elements) and unbonded post-tensioned strands (to provide self-centring capability). Nevertheless, currently available passive load-resisting systems to control the peak structural responses in steel rocking frames rely on sacrificial yielding components that accumulate damage during strong dynamic action. This results in a system with limited durability and a requirement for regular maintenance throughout the building's lifetime. By contrast, the recently proposed Buckling-Enabled Composite Bracing (BECB) elements can provide a thorough damage-avoidance solution by means of carefully controlled elastic buckling behaviour. In these systems, compression-only elements with circular-arc-shaped cross-sections are incorporated into steel rocking frames as lattice bracing in order to improve their dynamic performance. The proposed system has been shown to perform successfully under static loading and discrete sine-sweep ground motions for single-storey rocking frames. This further examines this innovative concept by performing numerical investigations on three-storey four-bay post-tensioned steel rocking buildings under real earthquake ground motions. The performances of conventional moment frames (MRFs) and their rocking frame counterparts (RFs) with and without BECB elements are compared through numerical simulations. Glass-fibre reinforced polymer (GFRP) is selected for the BECB elements. Static Pushover, Discrete Sine-sweep and Incremental Dynamic (IDA) analyses are performed to evaluate the buildings' performances. Damage measures investigated include maximum inter-storey drifts and floor accelerations. It is demonstrated that BECB members enhance the dynamic response of steel rocking frames by significantly reducing maximum storey drifts and accelerations.

Buckling-enabled bracing, Damage-avoidance, Rocking frame, Steel buildings
2311-9020
3117-3126
The European Association for Structural Dynamics
Kibriya, Leena T.
d417bd65-c5dc-46a4-bc20-2975aedb0766
Málaga-Chuquitaype, Christian
8aafba9a-7b97-4a30-a2d2-351f4877c665
Kashani, Mohammad M.
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Papadrakakis, Manolis
Fragiadakis, Michalis
Papadimitriou, Costas
Kibriya, Leena T.
d417bd65-c5dc-46a4-bc20-2975aedb0766
Málaga-Chuquitaype, Christian
8aafba9a-7b97-4a30-a2d2-351f4877c665
Kashani, Mohammad M.
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Papadrakakis, Manolis
Fragiadakis, Michalis
Papadimitriou, Costas

Kibriya, Leena T., Málaga-Chuquitaype, Christian and Kashani, Mohammad M. (2020) Damage-avoidance steel rocking frames with buckling-enabled composite bracing. Papadrakakis, Manolis, Fragiadakis, Michalis and Papadimitriou, Costas (eds.) In EURODYN 2020 - 11th International Conference on Structural Dynamics, Proceedings. vol. 2, The European Association for Structural Dynamics. pp. 3117-3126 .

Record type: Conference or Workshop Item (Paper)

Abstract

The severe social and economic impacts of recent earthquakes have inspired a growing interest in smart structural systems that offer immediate post-disaster occupancy. Post-tensioned rocking frames are emerging damage-avoiding seismic-resistant structures that employ rocking joints at member connections (to avoid major damage to primary structural elements) and unbonded post-tensioned strands (to provide self-centring capability). Nevertheless, currently available passive load-resisting systems to control the peak structural responses in steel rocking frames rely on sacrificial yielding components that accumulate damage during strong dynamic action. This results in a system with limited durability and a requirement for regular maintenance throughout the building's lifetime. By contrast, the recently proposed Buckling-Enabled Composite Bracing (BECB) elements can provide a thorough damage-avoidance solution by means of carefully controlled elastic buckling behaviour. In these systems, compression-only elements with circular-arc-shaped cross-sections are incorporated into steel rocking frames as lattice bracing in order to improve their dynamic performance. The proposed system has been shown to perform successfully under static loading and discrete sine-sweep ground motions for single-storey rocking frames. This further examines this innovative concept by performing numerical investigations on three-storey four-bay post-tensioned steel rocking buildings under real earthquake ground motions. The performances of conventional moment frames (MRFs) and their rocking frame counterparts (RFs) with and without BECB elements are compared through numerical simulations. Glass-fibre reinforced polymer (GFRP) is selected for the BECB elements. Static Pushover, Discrete Sine-sweep and Incremental Dynamic (IDA) analyses are performed to evaluate the buildings' performances. Damage measures investigated include maximum inter-storey drifts and floor accelerations. It is demonstrated that BECB members enhance the dynamic response of steel rocking frames by significantly reducing maximum storey drifts and accelerations.

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More information

Published date: 1 January 2020
Venue - Dates: 11th International Conference on Structural Dynamics, EURODYN 2020, , Virtual, Athens, Greece, 2020-11-23 - 2020-11-26
Keywords: Buckling-enabled bracing, Damage-avoidance, Rocking frame, Steel buildings

Identifiers

Local EPrints ID: 446138
URI: http://eprints.soton.ac.uk/id/eprint/446138
ISSN: 2311-9020
PURE UUID: c52a4e6e-c60a-4cbd-a845-8a9ba19ad5ef
ORCID for Mohammad M. Kashani: ORCID iD orcid.org/0000-0003-0008-0007

Catalogue record

Date deposited: 21 Jan 2021 17:35
Last modified: 20 Jan 2024 02:58

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Contributors

Author: Leena T. Kibriya
Author: Christian Málaga-Chuquitaype
Editor: Manolis Papadrakakis
Editor: Michalis Fragiadakis
Editor: Costas Papadimitriou

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