基于冗余度理论的连续斜交桥抗震鲁棒性分析
张航源1, 赵向凯2, 王军文1,3

(1.石家庄铁道大学 土木工程学院,河北 石家庄 050043; 2.北京铁路局丰台工务段,北京 100071 3.道路与铁道工程安全保障省部共建教育部重点实验室(石家庄铁道大学),河北 石家庄 050043)

连续斜交桥; 抗震能力; Pushover分析; IDA分析; 冗余度; 鲁棒性

Seismic robustness analysis based on redundancy theory of continuous skewed girder bridges
ZHANG Hangyuan1, ZHAO Xiangkai2, WANG Junwen1,3

(1. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China; 2.Fengtai Working Section of Beijing Railway Bureau, Beijing 100071, China; 3.Key Labratory of Roads and Railway Engineering Safety Control(Shijiazhuang Tiedao University), Ministry of Education, Shijiazhuany 050043, China)

continuous skew bridge; seismic capability; pushover analysis; IDA analysis; redundancy; robustness

DOI: 10.15986-j.1006-7930.2020.04.011

备注

以某高速公路三跨连续斜交桥为研究对象,利用OpenSees软件建立不同斜度的全桥有限元计算模型,采用Pushover方法得到结构的能力谱曲线,基于抗震冗余度理论分析了斜度对三跨连续斜交桥冗余度需求比r的影响; 运用增量动力分析(IDA)法求出结构的地震易损性曲线,基于抗震鲁棒性理论研究了斜度对抗倒塌储备系数RCM的影响.结果表明:冗余度需求比r与抗倒塌储备系数RCM均随斜度的增加而减小,且两者间存在较好的线性相关关系,说明可以使用抗震冗余度理论对连续斜交桥的抗震鲁棒性和抗震性能进行评价.

Taking a three-span continuous skewed girder bridge on a highway as the research object, OpenSees software was used to establish the full-bridge finite element model with different skew degree. The structural capacity spectrum curve was obtained by pushover method, and based on seismic redundancy theory, the effect of skew degree on the redundancy demand ratio r for a three-span continuous skewed girder bridge was analyzed. The structural seismic fragility curve was determined by a incremental dynamic analysis(IDA)method, and the influence of skew degree on the anti-collapse reserve coefficient RCM was studied on basis of seismic robustness theory. Results show that the redundancy demand ratio r and the anti-collapse reserve coefficient RCM decrease with the increase of skew degree, and there is a good linear correlation between the two indexes, which shows that the seismic robustness and seismic performance of the continuous skewed girder bridge could be evaluated by the redundancy theory.