体外预应力桥梁转向块构造分析及配筋设计  

Structure Analysis and Reinforcement Calculation of Deviator for External Prestressing Bridge

作　　者：卢春玲[1,2] 王强[1] 

机构地区：[1]桂林工学院土木工程系,广西桂林541004 [2]湖南大学土木工程学院,长沙410082

出　　处：《桂林工学院学报》2009年第1期75-80,共6页Journal of Guilin University of Technology

基　　金：广西建筑工程检测与试验重点实验室开放基金资助项目(桂科能07109005-12);广西教育厅科研项目(桂教科研200807LX194)

摘　　要：建立体外预应力桥梁转向块有限元模型并进行了应力分析,根据分析结果对转向块的构造进行优化并给出设计构造建议。根据体外预应力箱梁桥转向块的主应力矢量图和主应力云图确定转向块配筋设计的B区和D区,运用"弹性应力法"建立了转向块D区设计的拉压杆模型。由平衡条件算出拉杆内力,确定配筋面积及布置,并对配筋后的转向块进行有限元分析。结果表明,用拉压杆模型法进行转向块的配筋设计是合理可行的。After the finite element models are established to analyze the stress of the deviator zone of the external prestressing bridge, the conformation of the deviator is given according to the finite element analysis. Based on the principal stress vector diagram and principal distribution diagram, Reign B and D of the deviator of external prestressing bridge are determined. Strut-and-tie model of Reign D of the deviator is established by ＂elasticity stress method＂. The forces of strut-and-tie are calculated through balance qualification. The areas of the reinforcement are calculated and the reinforcement locations are determined. The finite element models are used to analyze the stress of the deviator with the reinforcement. The method of reinforcement designs for the deviator of external prestressing bridge by the strut-and-tie model is practical.

关 键 词：体外预应力 转向块 设计方法 拉压杆模型法 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]