预应力钢—混凝土组合结构连续桥梁的设计中需解决四个关键问题：1.超静定结构内力分析问题；2.体外预应力作用效应问题；3.钢与混凝土共同工作问题；4.钢箱局部稳定问题。本文在完成连续梁桥常规设计内容的基础上，较详细地分析了组合结构桥梁设计中的四个关键问题。并通过有限元分析方法进行了验证，结果表明本设计是合理的可靠的，可以应用于实际工程之中。
Prestressed steel-concrete composite structures for the design of bridges need to be addressed four key issues : 1. Super Static structural analysis of internal forces; 2. Prestressed Effect of in vitro; 3. Steel and concrete work together; 4. Local steel box stability. Based on the continuous girder bridge completed conventional design on the basis of content, a more detailed analysis of the composite structure in the design of the bridge four key issues. And finite element analysis methods of verification, the results show that the design is reasonable and reliable, It can be used in practical engineering.
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