摘要
预应力混凝土梁的上拱度过大将导致结构使用极限状态的失效。结合上海地铁三号线高架段的设计方案对该问题进行了理论上的探讨，提出采用部分预应力混凝土和对徐变预控措施相结合是减小上拱的有效途径。
Excessive camber of prestressed concrete beam causes the failure of service ability state in structure. This paper made a theoretical analysis of the method of predicting and controlling the camber, and indicated that a combination of partially prestressed concrete and control of creep in advance is an effective way to decrease the camber.
