预制预应力箱梁力学性能研究  

Research on Mechanical Properties of Precast Prestressed Box Girders

作　　者：田时雨 宋琢 卢德辉 陈明 TIAN Shi-yu;SONG Zhuo;LU De-hui;CHEN Ming(Canton One Construction Group Co.,Ltd.,Guangzhou 510060;Guangzhou Construction Co.,Ltd.,Guangzhou 510030;School of Civil Engineering and Transportation,Guangzhou University,Guangzhou 510006)

机构地区：[1]广州一建建设集团有限公司,广州510060 [2]广州建筑股份有限公司,广州510030 [3]广州大学土木与交通工程学院,广州510006

出　　处：《广州建筑》2025年第3期28-32,共5页GUANGZHOU ARCHITECTURE

基　　金：广州市建筑集团有限公司科技计划项目([2024]-KJ009、[2024]-KJ010、[2024]-KJ018)。

摘　　要：预制预应力箱梁因其承载力高、施工快捷等优势被广泛应用于桥梁工程中。预应力钢绞线的排布方式、预应力损失情况以及混凝土强度是箱梁设计、施工和使用过程中的关键问题。为此,本文采用有限元分析的方法研究了不同预应力钢绞线排布方式、预应力大小以及混凝土强度对装配式预应力箱梁力学性能的影响,结果表明:随着预应力钢绞线排数的增加,箱梁的初始刚度和峰值荷载逐渐增大,但增速逐渐放缓,预应力钢绞线排布越靠近箱梁底部受拉侧,对试件的承载力提升作用越明显;提高预应力值对提升箱梁的初始刚度和峰值荷载作用显著,但对峰值位移影响不大,预应力值每提升30%,箱梁刚度增加5%~6%,承载力提升6%~8%;混凝土强度的提高同样能够提升箱梁的承载力和刚度,混凝土标号每提升一个等级,箱梁刚度提高6%~8%,承载力提升8%~9%。Precast prestressed box girders are widely used in bridge projects because of their advantages such as high bearing capacity and fast construction.The arrangement of prestressing strands,prestressing loss and concrete strength are the key issues in the design,construction and application of box girders.For this reason,this paper adopted the method of finite element analysis to study the effects of different prestressing strand arrangement,prestressing strength and concrete strength on the mechanical properties of assembled prestressed box girders.The results showed that as the number of prestressed steel strand rows increases,the initial stiffness and peak load of the box girder gradually increased,but the growth rate gradually slowed down.The closer the prestressing strand rows were to the bottom tensile side of the box girder,the more obvious the effect of bearing capacity enhancement on the specimen was.Increasing the prestress value has a significant effect on enhancing the initial stiffness and peak load of the box girder,but little effect on the peak displacement.For every 30% increment in prestress value,the box girder stiffness increased by 5% to 6%and the load carrying capacity improved by 6% to 8%.The increase in concrete strength also improves the bearing capacity and stiffness of box girders.For each increase in concrete grade,the stiffness of the box girder increases by 6% to 8%,and the bearing capacity increases by 8% to 9%.

关 键 词：箱梁 预应力 预制 钢绞线 力学性能 

分 类 号：TU984[建筑科学—城市规划与设计]