摘要
以类双层顶推施工PC箱梁为研究对象,建立该桥ANSYS有限元模型,分析了其顶推过程中钢导梁及混凝土箱梁受力规律,并根据计算结果,使用体外纵向预应力对受力薄弱部位进行加固优化,优化结果表明:体外预应力可有效降低顶推过程中应力峰值,其中钢导梁最大拉应力降幅30.8%,钢混结合段拉应力降至1.53 MPa以下,且应力集中区域面积明显减小。
The PC box girder with double-layer push-up construction is taken as the research object. The ANSYS finite element model of the bridge is established. The force law of steel guide beam and concrete box girder during the pushing process is analyzed. According to the calculation result, the external longitudinal prestressing pair is used. The weakening of the weak part is optimized. The optimization results show that the external prestress can effectively reduce the stress peak during the pushing process. The maximum tensile stress of the steel guide beam is reduced by 30.8%, and the tensile stress of the steel-mixed joint is reduced to less than 1.53 MPa. The area of the concentrated area is significantly reduced.
作者
孙波
蒋鑫
SUN Bo;JIANG Xin(Hunan Transportation International Economic Engineering Cooperation Co,Ltd,Changsha,Hunan 410005,China;Hunan communications Research Institute Co.,Ltd,Changsha,Hunan 410005,China)
出处
《公路工程》
北大核心
2020年第4期152-157,共6页
Highway Engineering
基金
湖南交通科技项目(201454)。
关键词
类双层顶推箱梁
钢导梁
钢混结合段
体外纵向预应力
最大拉应力
double-layer push beam
steel guide beam
steel mixed joint
in vitro longitudinal prestressing
maximum tensile stress