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。
The U-shaped abutment is a common structure of infrastructure. However, the cracks often appear during the practice.
本文就城市桥梁设计中的桥梁上、下部结构及桥面系结构设计中的几个问题进行讨论。
This paper discusses some problems about bridge superstructure, bridge substructure and bridge decking of city bridge design.
结构计算：含桥梁上下部结构的静力、动力及屈曲稳定计算。
Structure calculation: include the static, dynamical and flection stabilization computation of bridge 's superstructure and the substructure.
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