摘 要
本桥梁设计依据国家现行相关设计规范、标准、城市规划管理局对工程方案设计的审查意见通知书，结合本工程的具体情况和有关资料进行编制。
天津金沽桥全长192m，荷载公路—Ⅱ级，主桥宽23.5m，桥面净宽—7+2×0.75m。上部结构采用钢筋混凝土简支T梁结构。本桥设置5cm厚沥青混凝土和8cm厚C25混凝土作垫层的桥面铺装。
主要设计过程是：
1、纵横断面设计：根据给定的基本设计资料，参考标准图、技术规范与经验公式，正确拟定桥梁纵断面和横断面的布置。
2、行车道板计算：确定行车道板类型，进行行车道板恒载内力计算、活载内力计算、作用效应组合，获得行车道板最大设计内力值
3、主梁内力计算：选取控制截面分别进行主梁恒载内力计算、活载内力计算，以及作用效应的组合计算。
4、配置钢筋及验算：根据主梁跨中最大弯矩设计值，进行主梁纵向受拉钢筋的配置，绘制跨中截面钢筋布置图。
5、进行预算
计算表明，各项验算均符合要求，设计方案合理。
关键词：混凝土，结构设计
Abstract
This bridge design in accordance with the relevant existing national design codes,standards,Urban Planning Administration Beau for review comments Notice engineering design,conbined with the specific circumstances and relevant information for the preparation of the project.
Tianjin Jingu bridge span 192m , highway design load Ⅱ, deck width: net -7 +2 × 0.75m, upper structure uses reinforced concrete simply-supported T beam structure, The bridge is set 5cm thick asphalt concrete and 8cm thick cushion C25 concrete for bridge deck.
Main design process:
1. Vertical and horizontal cross-section design: according to given basic design information, reference standard drawings, technical specifications and the empirical formula, the correct longitudinal section and cross section of the bridge layout developed.
2. Deck calculation: determine the lane plate type, make carriageway slab dead load internal force calculation, Live Load calculations, Combinations, get carriageway slab maximum design internal force
3. Girder internal force calculation:select main beam control section were dead load internal force calculation,Live Load calculations, as well as the effect of the combined action of the calculation.
4. Configuring reinforcement and checking: According to the design value of the maximum moment span girder, conducted longitudinal tensile steel girder configuration section reinforced draw span layout.
5.Budget
Calculations show that the checking meet the requirements, reasonable design.
工程设计概况
上部结构采用4跨简支桥梁，下部结构桥墩采用钢筋砼双柱式圆墩，桩基础；桥台采用柱式桥台，桩基础。桥面净空：净-7+20.75m人行道；荷载设计水平按二级公路设计。
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