- Conference Paper
Rights / licenseIn Copyright - Non-Commercial Use Permitted
In seismic regions, more often than never the dogma that bridge columns need to be firmly connected to the ground leads to huge pile foundations that require as much concrete as the superstructure. This is clearly a non-sustainable design method. To reduce the foundation design moment and possibly avoid the piles foundation, it has been proposed to let the bridge columns uplift and rock. 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. 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 post-uplift 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. Show more
Pages / Article No.
SubjectRocking bridges; Accelerated bridge construction; Sustainable seismic design; Precast bridges
Organisational unit09663 - Vassiliou, Michalis / Vassiliou, Michalis
ETH-10 18-1 - Seismic analysis, design and experimental testing of precast controlled-rocking negative-stiffness systems (ETHZ)
NotesConference lecture held on June 29, 2021.
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