1. 研究目的与意义（文献综述包含参考文献）
摘要：本文设计的是 30 50 30m 预应力混凝土箱梁桥，按照标准设计步骤来说，第一部分主要内容应该是通过水文计算确定桥长，并通过方案的比选确定出本次设计的桥型；第二部分的内容比较多，主要包括结构尺寸的拟定、恒载和活载内力计算、根据承载力配筋并进行截面的承载力和应力验算、张拉预应力钢筋和计算预应力钢筋的各种应力损失、验算局部承压和梁的挠度变形计算，同时还简单的计算复核了横隔梁和行车道板的承载力。
最后就是进行了下部结构盖梁的简单计算。
关键词: 预应力；箱梁；内力组合；承载力；应力损失Abstract: The design of this paper is 30 32 30m prestressed concrete box girder bridge, acco rding to the standard design steps, the first part of the main content should be through the h ydrological calculation to determine the length of the bridge, and through the selection of th e scheme to determine the design of the bridge; In the second part of the content is more, m ainly includes the structure size of dead load and live load, internal force calculation, accordi ng to the bearing capacity of reinforcement and bearing capacity of cross section and stress c alculation, tensioned prestressed and calculation of prestressed reinforcement stress loss an d local pressure calculation and beam deflection deformation calculation, also simple calcula tion but I check the cross beam and traffic capacity. Finally, the simple calculation of the subs tructure cover beam is carried out.Key words: prestress; Box girder. Internal force combination; The bearing capacity; Stress loss
2. 研究的基本内容、问题解决措施及方案
本次设计课题为某连续梁桥设计与计算。
桥梁跨度为30 50 30m，桥面宽度为25.5m，未布置人行道。
采用等高度箱形截面， 主梁施工拟采用先简支后连续法。
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