Shen, Yu;
Freddi, Fabio;
Li, Jianzhong;
(2024)
Seismic response of unbonded precast post-tensioned bridge piers with multi-rocking interfaces.
In:
Proceedings of the 18th World Conference on Earthquake Engineering (WCEE 2024).
World Conference on Earthquake Engineering (WCEE): Milan, Italy.
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Abstract
In the last few decades, several research studies have focused on the development of unbonded post-tensioned (PT) bridge piers defined according to accelerated bridge construction (ABC) techniques. These solutions showed several advantages in terms of minimal damage seismic response, hence promoting the objectives of seismic resilient structures of modern societies. These piers can be built with either a single rocking interface at the base or multiple rocking interfaces along the pier height. The present paper investigates and compares the design and seismic response of unbonded PT bridge piers with base or multi-rocking interfaces. Bridge piers previously tested by the authors and showing single or multiple rocking interfaces are considered for case study purposes. Finite element models are developed in OpenSees, including mechanical and geometric non-linearities, and validated against the experimental results. Non-linear time-history analyses are performed in an Incremental Dynamic Analyses (IDAs) fashion to evaluate the seismic response of each configuration. IDAs are carried out with two sets of pulse-like and no-pulse-like ground motions, respectively. The results highlight the differences in the seismic response of the two types of bridge piers and the two sets of records. Compared to the base rocking bridge piers, multi-rocking pier systems show a larger rockingrelated response (e.g., the lateral displacement), while their acceleration-related response (e.g., the shear force) was comparable. On the other side, the multi-rocking pier mechanism results in a more severe PT force loss. In addition, the pulse-like feature of the ground motions can, to some extent, amplify the seismic responses related to the pier’s deformation. The paper provides useful insights into the optimal design of seismic resilient unbonded PT bridge piers.
| Type: | Proceedings paper |
|---|---|
| Title: | Seismic response of unbonded precast post-tensioned bridge piers with multi-rocking interfaces |
| Event: | 18th World Conference on Earthquake Engineering (WCEE2024) |
| Location: | Milan |
| Dates: | 30 Jun 2024 - 5 Jul 2024 |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | https://www.wcee2024.it/ |
| 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. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS 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/10195513 |
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