Title: Research on seismic response of long-span continuous rigid frame bridge in degraded permafrost regions

Authors: Jianning Li; Xuexian Sun; Ziqi Li; Wei Lu

Addresses: School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China ' School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China ' School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China ' School of Civil Engineering, Northwest Minzu University, Lanzhou, Gansu 730030, China

Abstract: To study the influence of permafrost degradation on seismic response of a bridge, a large-span continuous rigid frame bridge in warm permafrost regions of Qinghai-Tibet Plateau was used as research object, two permafrost degradation modes have been studied, Results showed that permafrost temperature has less influence on seismic response of rigid-framed pier but more obvious on movable pier under the overall warming degradation mode. However, the maximum bending moment of pile decreases and its position move down with temperature rise, while along transverse direction, the position all at top of piles. When under top-bottom degradation mode, only movable pier are significantly affected in longitudinal direction. The maximum bending moment of pile increases and its position move down with degradation depth. In general, the adverse effects caused by permafrost degradation should be considered in piles, but for piers just consider it to a certain extent.

Keywords: bridge engineering; permafrost degradation; seismic analysis; overall warming degradation; top-down degradation; seismic response.

DOI: 10.1504/IJESMS.2022.123958

International Journal of Engineering Systems Modelling and Simulation, 2022 Vol.13 No.3, pp.200 - 208

Received: 19 Oct 2020
Accepted: 16 Aug 2021
Published online: 05 Jul 2022 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article