湖南大学学报（自然科学版）2024，Vol.51Issue(11)：126-137,12.DOI:10.16339/j.cnki.hdxbzkb.2024114
PC与钢-UHPC混合式连续梁桥结合段受力分析
Mechanical Analysis on Joint Section of PC and Steel-UHPC Hybrid Continuous Girder Bridges
摘要
Abstract
In order to solve the engineering problem of continuous box girder bridges with severe cracking due to excessive self-weight,a combined PC and steel-UHPC composite beam continuous hybrid girder bridge is proposed.To investigate the mechanical properties of the UHPC layer in the new type of bridge as well as its effect on the force transfer mechanism of the joint section of steel-UHPC composite girder,a Midas integral FE model was established to obtain the internal force of the structure under the design load effect,taking Binzhou Yellow River Bridge in Shandong Province as the engineering background.Meanwhile,two FE sub-models of the joint section of the steel-UHPC composite girder with and without UHPC layer were established by using ANSYS,respectively.The differences between the two models in the force performance and load transfer mechanism of the steel-concrete joint section were compared,and the mechanical properties of the UHPC layer were analyzed.The FE results show that:1)Except for some stress concentration areas,the stresses in all parts of the new structure are lower than the strength design value,meeting the design requirements;2)Under the most unfavorable bending moment,the maximum tensile stress of the top plate of the new structure's steel box girder is significantly reduced,which can significantly improve the fatigue life of the steel structure;3)The stress at the interface of the top plate of the new structural concrete beam is decreased by about 5%～29%,which can improve the cracking resistance;4)The maximum tensile and compressive stresses of the UHPC layer are lower than their design strength,meeting the design requirements,and the UHPC layer can share 4%～10.9%of the bending moment of the joint section.关键词
桥梁工程/混合梁结合段/数值分析/力学性能/钢-UHPC组合梁Key words
bridge engineering/joint section of hybrid girder/numerical methods/mechanical properties/steel-UHPC composite girder分类
交通工程引用本文复制引用
邵旭东,熊满华,怀臣子,莫然,杨纪..PC与钢-UHPC混合式连续梁桥结合段受力分析[J].湖南大学学报（自然科学版）,2024,51(11):126-137,12.基金项目
湖南省研究生科研创新项目(CX2017B118),Postgraduate Scientific Research Innovation Project of Hunan Province(CX2017B118) （CX2017B118）
国家自然科学基金重点项目(52038003),Key Project of National Natural Science Foundation of China(52038003) （52038003）
河南省重点研发计划资助项目(212102310452),Key R&D Program of Henan Province(212102310452). （212102310452）
