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摘 要
本次设计的题目是预应力混凝土T型梁桥的设计。
本设计采用预应力混凝土T型梁桥，跨径布置为（7×30）m，主梁为变截面T型梁。跨中梁高为2m。桥墩为重力式桥墩桥台和桩基配肋式桥台。
本文主要阐述了该桥的设计和计算过程。首先对主桥进行总体结构设计，然后对上部结构进行内力、配筋计算，再进行强度、应力及变形验算，最后进行下部结构验算。
具体包括以下几个部分：桥型布置，结构各部分尺寸拟定；选取计算结构简图；恒载内力计算；活载内力计算；荷载组合；配筋计算；预应力损失计算；截面强度验算；截面应力及变形验算；下部结构验算。
关键词 预应力混凝土，T型简支梁桥，桥墩，桥台
ABSTRACT
This design is of the same section Prestressed Concrete t-shaped supported beam bridge design.
The bridge belongs to the prestressed concreted structuer which is a simple supported beam bridge.The span arrangement is （7×30）m.The superstructure is variable T shaped supported beam bridge.The height of the girder on the support is 1.80m,and the height of the middle is 1.80m too.The pier is gravity pier. The abutment is gravity abutment.
This essay focuses on the design and calculation process of the bridge.Firstly, make an overall structure design of the main span.Secondly perform the calculation of the internal force and reinforcing bar on the superstructure.Thirdly,check the intensity,stress and deflection.Finally,check the substructure..
The main points of the design are as the follows:The arrangement of the bridge types;The units partition of the structute;The calculation of the internal force of dead load;The calculation of the internal force of movable load;The combination of every kind of load;The arrangement of prestressed reinforcing bar;The calculation of the prestressed loss;The check of the section intensity;The check of the section stress and deflection;The check the substructure.
Key words Prestressed conctete， T shaped supported beam bridge，pier，abutment | 
