吉首大学学报（自然科学版）2026，Vol.47Issue(2)：62-71,10.DOI:10.13438/j.cnki.jdzk.2026.02.009
主余震作用下近海钢筋混凝桥梁的地震响应
Seismic Response of Offshore Reinforced Concrete Bridges Under Main-Aftershock Sequences
摘要
Abstract
To investigate the seismic response evolution of offshore bridges under the coupled effects of main-aftershock sequences and chloride-induced erosion,a time-dependent damage finite element model of a three-span,three-column simply supported bridge was established based on energy dissipation theory and static pushover analysis.Seismic time-history analysis was conducted to obtain key response indica-tors,including the maximum displacement and residual displacement at the pier top,as well as the pro-portion of cumulative hysteretic energy generated at the pier bottom during aftershocks.The results show that structural durability degradation significantly affected the seismic responses:under the same seismic excitation,the maximum pier-top displacement of long-term service bridges increased by at least 10%,with a maximum increase of up to 43%,compared with newly built bridges.When subjected to high-intensity earthquakes,the residual displacement at the pier top continuously increased with service time,rising by 66%,121%,and 163%after 50,75,and 100 a of service,respectively,compared with new bridges.Aftershocks induced noticeable cumulative damage at critical locations such as the pier bottom,with the cumulative hysteretic energy accounting for an average of 14.08%of the total energy dissipation during the main-aftershock sequence,reaching a maximum of 25.3%.Therefore,it is recommended that both the energy contribution of aftershocks and the effect of durability degradation be considered in the seismic design of offshore bridges.关键词
主余震/氯离子侵蚀/简支桥/最大位移/残余位移/滞回曲线Key words
main-aftershock sequences/chloride ion erosion/simply-supported bridge/maximum displace-ment/residual displacement/hysteresis curve分类
交通工程引用本文复制引用
曹竞,李悦,张常勇,李冲..主余震作用下近海钢筋混凝桥梁的地震响应[J].吉首大学学报（自然科学版）,2026,47(2):62-71,10.基金项目
National Natural Science Foundation of China(51408009) （51408009）
Project of Basic Research Funds for Uni-versities in Beijing(110052971921/062) （110052971921/062）
