Citation

Gao F, Chen XC, Yan SH. Tiedao Xuebao 2006; 28(5): 71-77.

Affiliation

School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

Copyright

(Copyright © 2006, Zhongguo tie dao chu ban she)

DOI

unavailable

PMID

unavailable

Abstract

It is worth attaching importance to the problem that the frozen earth layer has influence upon the aseismatic safety of bridges. Using the soil-structure interaction method that can simulate the radiant function of waves by use of the artificial viscidity-elasticity boundary, the responses of bridges under multifarious earthquakes in permafrost and seasonal frozen regions are calculated. The influence of the frozen earth layer change on the seismic responses of bridges is analyzed. The general distributing law of bridge pier stresses under seismic loading is summarized on condition of different sites, different frozen soil layer thicknesses, different heights of bridge piers and different bridge foundations. The analysis results are as follows: on sites type 2, frozen earth layers have marked influence on seismic responses of bridge piers and the maximum stress difference for different types of frozen earth layer sites may reach more than one time; when bridge piers are 10 to 22 m high, frozen earth layers have the most notable effects on pier seismic responses; the types of pier foundations may be neglected when the pier seismic responses are compared between winter and summer; in general, bridge pier seismic responses have close relationship with the frozen earth features, dynamic characteristics of bridge piers and seismic wave features. It needs to consider the interaction between bridge piers and frozen earth layers because it is not safe to apply thawy soil conditions to bridge design.