中外公路2025，Vol.45Issue(1)：20-30,11.DOI:10.14048/j.issn.1671-2579.2025.01.003
考虑材料冻融劣化与多年冻土退化影响效应的桥梁桩基础抗震性能
Seismic Performance of Bridge Pile Foundation Considering Effects of Material Freeze-Thaw Deterioration and Permafrost Degradation
摘要
Abstract
In cold and high-seismic regions,such as the Qinghai-Xizang Plateau in China,the deterioration of material properties caused by freeze-thaw cycles and permafrost degradation due to climate change have become increasingly severe,posing significant challenges for the seismic performance assessment of bridge pile foundations.To systematically investigate the impact of permafrost degradation and material freeze-thaw deterioration on the seismic performance of bridge pile foundations and ensure proper seismic design,a finite element model was established,considering the dual effects of permafrost degradation and material freeze-thaw deterioration.A comparative analysis was conducted to evaluate the influence mechanisms of various factors on the seismic performance of bridge pile foundations in permafrost regions.The results indicate that as the bridge service life increases,the horizontal bearing capacity,equivalent stiffness,and energy dissipation capacity of the pile-permafrost system all show a decreasing trend.Notably,the combined effect of permafrost degradation and material freeze-thaw deterioration has a more significant impact on the seismic performance of the bridge pile foundations.Specifically,after 100 years of bridge service,the horizontal bearing capacity of the pile-permafrost system reduces to approximately 55%of its initial value,whereas when only permafrost degradation is considered,the horizontal bearing capacity drops to around 89%of its initial value.Therefore,neglecting the effect of material freeze-thaw deterioration will lead to an unsafe seismic performance assessment of the bridge pile foundation.In the seismic performance analysis of bridge pile foundations in permafrost regions,it is essential to consider not only the effect of permafrost degradation but also the impact of material freeze-thaw deterioration.关键词
桥梁桩基础/抗震性能/多年冻土退化/材料冻融劣化/有限元模型Key words
bridge pile foundation/seismic performance/permafrost degradation/material freeze-thaw deterioration/finite element model分类
交通工程引用本文复制引用
张熙胤,于生生,王万平,文海荣..考虑材料冻融劣化与多年冻土退化影响效应的桥梁桩基础抗震性能[J].中外公路,2025,45(1):20-30,11.基金项目
国家自然科学基金资助项目(编号:52068045) （编号:52068045）
