1、 I 摘摘 要要 目前，预应力混凝土被广泛的使用于各种中小跨度的桥梁中，而且大量采用 预应力混凝土将是未来桥梁发展的趋势。在本次毕业设计中，对目前在公路桥梁 中经常使用的预应力混凝土简支 T 型梁桥的设计做了全面的介绍，其中包括调 研，外文资料的翻译，方案设计，结构计算以及施工图的绘制。在确定方案时， 根据调研及查阅大量的资料，在此桥位上布置了钢管混凝土桥，钢筋混凝土箱型 拱桥及预应力混凝土简支 T 型梁桥三种设计方案，根据“安全，功能，经济，美 观”的原则，对各种桥型的优缺点进行了比选，而预应力混凝土简支 T 型梁桥在 此桥位上更具有竞争力，反映在工程造价比较低，施工工期短，施工技术成熟，
2、因此，最终选择了预应力混凝土简支 T 梁桥为设计方案。 结构计算着重进行了 上部结构的计算，包括截面尺寸的拟定，内力计算（恒载内力，活载内力和附加 内力的计算，内力组合以及影响线） ，配筋设计，施工阶段和使用阶段的应力验 算，承载能力极限状态强度验算，刚度验算，变形验算。 通过本次毕业设计，进一步加深了我对桥梁以及预应力混凝土的认识。 关键词关键词 预应力混凝土;T 型梁桥;结构计算;设计方案;施工图 II III Abstract Nowdays, the pre-stressed concrete is extensively used in various kinds of bridge
3、s of medium and small span ,and it will be development trend of the bridge in the future to adopt the bridge of the pre-stressed concrete in a large amount in this graduation design ,overall introduction of the pre-stressed T-section concretebeam bridgeaamongahighwayabridgeaoftenausedaatapresent,inc
4、ludingainvestigationaandad research,translation,conceptualdesign ,calculation of structure and drawing,according to investigation, research and information. The concrete-filled steel tubular arch bridge , the rigid bridge, cable-stayed bridge of three spans, suspension bridge ,cable-stayed bridge of
5、 twospans,the pre-stressed T-section concrete beam bridge ,according to the principle of the design of the scheme , introduction to the advantage and disadvantage of the various bridges are made , but the pre-stressed T-section concrete beam bridge is in conformity with this location ,and the projec
6、tion fabrication cost is lower, the time for a projection is very short ,construction technology is ripe so , I choose the pre-stressed T-section concrete beam bridge on the location finally .The calculation of structure mainly includes the superstructure such as studying out size of section ,calculating the internal force (the calculation of the internal force under constant load, mobile load and additional load );the design of reinforcing;the checking computation of the stress in the construc
