Abstract: The U-shaped abutment is a common structure of infrastructure．However，the cracks often appear during the pracdee． Based on the specifications and the numerical analyses of FEA，some proposals are given out about inner and outer side slope for the common U-shaped abutment．Furthermore，some measurements and design methods which could reduce the stress and deform ation，such as setting the chamfer，reinforced concrete ring beam between the fore wall and the two side walls.emplacing the pre-stressed concrete bar or reinforced concrete pull-beam between the two side walls．These measurements and methods can be reference during designing and reinforcing bridges

Key words: U-shaped abutment, structural pattern , design , reinforcement

摘要： U型桥台是公路桥梁下部结构常用的构造，在工程实践中，U型桥台常常出现开裂.依据规范的有关条文，结合 有限元数值分析结果，给出了常用桥台的构造内坡比和增设桥台外坡的建议值；进一步提出了改善桥台受力和减小 变形的措施和设计方法，包括在前墙与侧墙交汇处增设倒角、前墙与侧墙外侧设置钢筋砼圈梁、在侧墙两侧设置预 应力砼拉筋法或钢筋砼拉梁法等，供设计和加固时参考.

关键词: U型桥台, 构造型式, 设计, 加固