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1、I摘 要本工程名称为崖头湾大桥设计，设计贯彻“实用、安全、经济、美观”的设计原则，按照建筑设计规范，认真考虑影响设计的各项因素，进行必要的方案比选，最终确定最佳方案为装配式预应力混凝土简支 T 梁，标准跨径为 1030=300。该m桥采用双向分离式四车道，全桥横向宽度 23.5。本桥为旱桥，所处地层自上而下m依次为种植土、强风化砂岩、弱风化砂岩、微风化砂岩。钻孔所涉及的深度范围内未见构造破碎带，场地稳定。设计时主要进行了结构方案中 T 型主梁承载能力的计算。在确定主梁与横隔板的布置之后，先进行了梁毛截面几何特性的计算、截面效率指标的检验，接着进行恒载内力的计算,然后利用荷载横向分布系数计算活载
2、内力，进而按荷载组合初步确定预应力钢束的配置，考虑预应力损失，同时进行重力式墩台的计算，最后用桥梁博士验算设计是否符合规范要求。关键词：简支 T 梁 荷载计算 预应力 桥梁博士IIAbstractThe name of this project is Yatou Bay Bridge. The design implement “practical, security, economical, aesthetic”, the design principles. With the architectural rules, design seriously consider the influe
3、nce of the various factors, conduct the necessary programs, and ultimately determine the best option, prestressed concrete simple supported T beam, whose standard span is 1030=300 meters, full-bridge transverse width is 23.5 meters. The bridge is overpass, in which the stratum from top to bottom is
4、planting soil, strongly weathered sandstone, weak weathered sandstone, weathered sandstone. The fracture zone is not founded in the depth range covered by the drilling.This design mainly calculate the load capacity of the T beam. In determining the layout of the main beam and the diaphragm, the firs
5、t calculation is the beam gross section, geometric characteristics, the inspection of the cross-section efficiency indicators, followed by the calculation of dead load of the internal force, and then use lateral load distribution factors to calculate the live load, initially determine the configurat
6、ion of the prestressing stell beam and then press the load combination, considering the loss of prestress. At the same time, calculate the gravity pier. Last, check the design whether to meet the requirements with doctor bridge.Key words：simple supported T beam load calculation prestressed doctor br
7、idgeIII目目 录录摘要.Abstract.绪论.11 桥梁方案比选.21.1 方案比选的原则.21.2 方案比选.31.2.1 预应力混凝土简支 T 梁桥.31.2.2 下承式钢管混凝土拱桥.31.2.3 预应力混凝土连续箱梁桥.42 预应力混凝土简支 T 形梁桥设计.62.1 设计资料及构造布置.62.1.1 设计资料.62.1.2 构造布置.72.2 梁毛截面几何特性的计算.82.2.1 截面几何特性.82.2.2 检验截面效率指标.132.3 主梁内力计算.132.3.1 恒载内力计算.132.3.2 主梁活载横向分布系数计算.152.3.3 活载内力计算.182.3.4 主梁内力组合.212.4 预应力钢筋面积的估算及其布置计算.212.4.1 估算预应力面积.212.4.2 钢束布置.222.4.3 钢束预应力损失计算.232.4.4 预加内力计算及钢束预应力损失汇总.25IV3 梁式桥墩台的计算.253.1 最不利荷载效应组合.273.1.1 作用在桥梁墩台的作用与作用计算.253.1.2 效应组合.
