防灾减灾工程学报2024，Vol.44Issue(2)：273-282,10.DOI:10.13409/j.cnki.jdpme.20231130005
基于F-J-M法的桥梁温度与地震作用效应组合研究
Study on Combined Effects of Bridge Temperature and Seismic Actions Based on F-J-M Method
摘要
Abstract
Currently,the design of railway bridges is gradually transitioning from the allowable stress method to the limit state method.However,the Code for Design on Railway Bridge and Culvert(Limit State Method)(Q/CR 9300-2018)does not account for the combined effects of seismic actions and variable factors such as temperature,posing significant challenges for seismic design for bridges in areas of extreme cold and high seismic intensity.In order to promote bridge resistance to external loads in a more cost-effective way,the partial coefficient of the optimal seismic design condition load combination was determined by target reliability indices,thereby optimizing the seismic design stan-dards in current bridge design codes.A probability model for temperature effects on a bridge in cold re-gions was established.The distribution characteristics of the effects of earthquake and ambient temper-ature were explored using the Ferry Borges load combination theory.Expressions of the load factor of earthquake and temperature effects were established using JC method and multi-hazard load factor de-sign method(MH-LRFD).Taking a practical bridge engineering project as an example,the failure probabilities of a bridge under earthquake,temperature,and their combined actions were explored re-spectively.The results showed that both the temperature internal force response caused by ambient temperature and the variation in properties of the bridge's main components significantly affected its failure probability.For extreme cold regions with significant temperature variations,ignoring ambient temperature in the current codes would significantly underestimate the failure probability under seismic actions.The proposed F-J-M(Ferry Borges-JC-MH-LRFD)method can be used to calculate the com-bined coefficients for earthquake and temperature actions,providing a necessary theoretical basis for the seismic design of bridges in extreme cold regions.关键词
温度效应概率模型/失效概率/Ferry Bordge法/MH-LRFD/荷载系数Key words
probability model of temperature effects/failure probability/Ferry Borges method/MH-LRFD/load factor分类
建筑与水利引用本文复制引用
王力,潘启仁,周晓夫,杨喜娟,唐智勇..基于F-J-M法的桥梁温度与地震作用效应组合研究[J].防灾减灾工程学报,2024,44(2):273-282,10.基金项目
国家自然科学基金资助项目(52068045)、甘肃省高等学校青年博士基金项目(2023QB-045)、兰州交通大学甘肃省重点实验室开放课题(2022055)资助 （52068045）
