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摘 要
随着我国桥梁事业的发展，国内桥梁形式复杂多样，发展迅速，但是，先简支后连续预应力混凝土梁桥仍在我国桥梁行业内占据重要地位。当前，我国大部分公路桥，城市高架桥以及近年我国大力支持的高铁，基本都以连续梁桥做为主要的结构形式，主要是因为这种桥梁的优点具有易取材，施工方便、快速，耐久以及美观等一系列优点。
本次设计选用的结构形式为先简支后连续T梁，设计该桥的主要结构包括：桥面板，横隔梁，支座，盖梁，桥墩等。横隔梁和行车道板两部分结构，把主梁连接为一个整体。桥面的其它部分，例如伸缩缝，防撞栏，桥面混凝土铺装层，虽然设计中没有对这几部分进行计算，但他们也是桥梁不可或缺的重要组成部分。
桥梁的承载力主要受跨中弯矩的影响，由活荷载和永久荷载特别是结构自重引起的跨中弯矩，会随桥梁跨径增大而增大，本设计采用单跨30m跨径，长度合理，跨中弯矩在可控范围内，使本桥具有足够的安全性。通过计算主梁内力、预应力钢筋、行车道板、盖梁、桩基础以及对主梁的强度验算等，可以完成本桥的设计，设计过程中，所有计算以及要求必须满足规范的要求。
关键词：预应力；连续梁桥；强度验算
Abstract
With the development of the cause of the bridge, the bridge complex and diverse domestic form, the rapid development, however, the simply supported - continuous prestressed concrete beam bridge is still within our bridge industry occupies an important position. At present, the small span of a permanent bridge, whether it is a road bridge or viaduct city, including the current support of high-speed rail development, mostly in prestressed concrete beam bridge, primarily because the advantages of this bridge has place drawn, mechanized construction, good durability, adaptability, and a beautiful series of advantages
This design uses Simple Support and Continuous T beam structure, the structure of its upper bearing member is mainly composed of the main beam, the crossbeam, lane plate, bridge and abutment and the like. For the vehicle load between the main beams have better lateral distribution of the traffic lane by the crossbeam and the main beam connection board as a whole. The design of the bridge parts have pavement, joints and parapets, etc. These structures also about the overall safety performance of the bridge, though not as a load-bearing member of the bridge, but the bridge is an important structure, which is built on this design He has done a detailed explanation
The span of the bridge by the impact moment, with the span increases across the load and live load moment caused by exercise and also increased, mainly by the concrete material itself cause weight moment increases, thus affecting the present bridge span and bearing capacity. The design uses a single span 30m span, reasonable length, cross the moment under control, so that the bridge has adequate security. By calculating the main beam internal force, prestressing steel, lane plate, cover beams, pile foundation and the main beam of intensity checking, etc., to be completed this bridge design, the design process, all calculations and requirements must be met regulatory requirements窗体底端
The span of the bridge by the impact moment, with the span increases across the load and live load moment caused by exercise and also increased, mainly by the concrete material itself cause weight moment increases, thus affecting the present bridge span and bearing capacity. The design uses a single span 30m span, reasonable length, cross the moment under control, so that the bridge has adequate security. By calculating the main beam internal force, prestressing steel, lane plate, cover beams, pile foundation and the main beam of intensity checking, etc., to be completed this bridge design, the design process, all calculations and requirements must be met regulatory requirements
Key word: Pre-stressed; continuous bridge; Strength checking | 
