Quasi-static tests of negative stiffness columns for resilient seismic design
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Date
2021
Publication Type
Conference Paper
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yes
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Abstract
This paper presents quasi-static testing of a 1:5 scale precast restrained rocking bridge column exhibiting negative stiffness. The proposed system is resilient, able to achieve limited to no damage during design earthquakes. It allows prefabrication and quick on-site assembly, which reduces the on-site construction time and traffic impact. Compared to positive stiffness restrained rocking solutions, the negative stiffness system further reduces the design moments of the foundation and could possibly reduce the need for a pile foundation. As part of this experimental campaign, quasi-static cyclic tests were carried out on a reinforced concrete column allowed to rock on its interface with the foundation and cap-beam. An unbonded tendon was adopted to restrain the columns. The tendon was connected in series to a Belleville spring system to keep the overall postuplift stiffness of the system negative. Large drifts lead to stress concentrations at the ends of the columns, therefore they were protected by steel jackets. The column was subjected to drift ratios up to 15%. The results show that it returned to its original position with negligible to no residual displacement.
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published
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Book title
Proceedings of the Seventeenth World Conference on Earthquake Engineering Japan 2021
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Pages / Article No.
Publisher
National Information Center of Earthquake Engineering
Event
17th World Conference on Earthquake Engineering (17WCEE 2020-21)
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Date created
Subject
negative stiffness; rocking; reinforced concrete; bridge design; Accelerated Bridge Construction
Organisational unit
09663 - Vassiliou, Michalis (ehemalig) / Vassiliou, Michalis (former)
Notes
Conference lecture held at poster session on September 28, 2021. Conference postponed due to Corona virus (COVID-19). Conference rescheduled from September 13–18, 2020 to September 27 – October 2, 2021
Funding
ETH-10 18-1 - Seismic analysis, design and experimental testing of precast controlled-rocking negative-stiffness systems (ETHZ)