基于ABAQUS的公路拱涵承载力等级评定优化研究  

Optimization research on the bearing capacity rating of highway arch culverts using ABAQUS

作　　者：谭舒之 Tan Shuzhi(Suqian Port and Shipping Development Center,Suqian Jiangsu 223800,China)

机构地区：[1]宿迁市港航事业发展中心,江苏宿迁223800

出　　处：《山西建筑》2024年第20期170-174,共5页Shanxi Architecture

摘　　要：桥涵的安全评定,直接决定桥涵是否需要维修加固,其中评定方法和评定准确度是两个关键因素。针对我国桥涵承载力等级评定方法并不完善的问题,深入研究了美国荷载和抗力系数评定法(LRFR)参数选取和运用过程。使用有限元软件ABAQUS建立二维有限元简化模型,还原施工现场拱涵上部土体分层回填过程,提高恒载内力分析准确度,并与整体计算结果对比,证明两种计算对拱涵影响存在差异。然后对一拱涵工程实例,在分层计算下使用荷载和抗力系数评定法(LRFR)进行承载力评定分析,并对比整体计算评定结果。结果表明,分层计算还原施工现场,降低与实际检测差异性,可以显著提高评定准确度,为完善和优化我国老旧桥涵评定方法提供参考。The safety assessment of bridges and culverts directly determines whether they require maintenance and reinforcement,with the assessment method and accuracy being two critical factors.Addressing the issue of incomplete evaluation methods for the bearing capacity of bridges and culverts in China,an in-depth study was conducted on the parameter selection and application of the Load and Resistance Factor Rating(LRFR)method used in the United States.Utilizing the finite element software ABAQUS,a simplified two-dimensional finite element model was created to replicate the layered backfilling process of the upper soil of the arch culvert at the construction site,enhance the accuracy of internal force analysis under dead load,and compare these findings with overall calculations to demonstrate the differing impacts on the arch culvert.Subsequently,for a practical arch culvert project,the Load and Resistance Factor Rating(LRFR)method was employed to assess bearing capacity using layered calculations,and these results were compared with the overall evaluation outcomes.The findings reveal that layered calculations,by accurately replicating the construction site and minimizing discrepancies with actual testing,can significantly enhance the accuracy of assessments.This provides valuable insights for refining and optimizing the assessment methods for old bridges and culverts in China.

关 键 词：拱涵 承载能力评定 分层计算 LRFR 有限元分析 

分 类 号：TU997[建筑科学—市政工程] U449.84[建筑科学—桥梁与隧道工程]