体外预应力桥梁混凝土锚固结构受力性能分析  

Stress Performance Analysis on Concrete Anchor Block of Externally Prestressed Bridges

作　　者：阳令明 李丽民 刘汉民 YANG Ling-ming;LI Li-min;LIU Han-min(College of Civil and Environmental Engineering,Hunan University of Science and Engineering,Yongzhou 425199,China)

机构地区：[1]湖南科技学院土木与环境工程学院,永州市425199

出　　处：《北方交通》2019年第4期8-11,15,共5页Northern Communications

基　　金：湖南省自然科学基金资助项目(2015JJ2073);湖南科技学院科研项目(2015XKY023)

摘　　要：基于ANSYS有限元分析软件,建立了体外预应力桥梁角隅矩形齿块的拉-压杆模型,推导出拉-压杆最小夹角公式,确定了夹角合理取值范围是24.8°～65.2°,分析了拉-压杆夹角、锚固块厚度、锚固块截面尺寸、箱梁腹板斜率等变化时角隅矩形齿块的受力变化,发现拉应力主要集中在锚下10cm内,压应力主要集中在锚下20cm内。特定荷载作用下,角隅矩形齿块存在一个合理的厚度取值,可供工程设计提供参考。Based on the finite element analysis software ANSYS,a strut-and-tie model for corner rectangular anchor block of externally prestressed bridges was modeled,and a theory formula of the strut-and-tie minimum angle was derived,which reasonable numerical value range of 24.8°~65.2°was also given out.In addition,influencing factors of strut-and-tie minimum angle,thickness of corner rectangular anchor block,section dimension and slope of box girder webs were analyzed,the conclusions of the maximal tensile stress occurred within 10cm of corner rectangular anchor block,the maximal compressive stress occurred within 20cm were obtained When the corner rectangular anchor block is under a given constant load condition,a reasonable scope of anchor block s thickness is existent.

关 键 词：体外预应力桥梁 角隅矩形齿块 拉-压杆模型 有限元分析 

分 类 号：U441[建筑科学—桥梁与隧道工程]