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摘要: 简支梁桥的使用非常广泛，是梁桥中应用最早一种桥型。简支梁桥适应性强，能够工业化施工并且可以就地取材，具有良好的耐久性,并且外形美观，具备较好的整体性等多种优点。本设计依据给定的设计资料，参考《公路钢筋混凝土及预应力混凝土桥涵设计规范》JTGD62-2004与《公路桥涵设计通用规范》JTGD60-2004进行20m预应力混凝土简支T梁设计与计算。本设计简支梁桥的标准跨径为20m，计算跨径为19.50m。设计资料中，，设计行车车速20km/h，为公路—II级荷载。设计计算内容主要包括主梁内力计算、预应力钢束估算及布置、主梁截面强度验算、行车道板内力计算、钢筋预应力损失、主梁变形计算、锚固段局部承压验算等。设计验算结果符合规范要求，所用的方法准确合理。19965
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关键词：简支T梁桥；预应力混凝土结构；后张法；预应力钢筋布置；行车道板内力计算
The design and calculation of 20 m pre-stressed concrete beam bridge
Abstract ：Single supported beam bridge is one of the most early applied and widely used bridge in the world. This kind of bridge has the advantage of good durability,compatible, besides, it has industrialization construction and easy to find the local material. 20 m pre-stressed concrete beam bridge overall layout and the design and calculation of the upper structure is based on the designed data and《highway reinforced concrete and pressed concrete bridge and culvert design specification》(JTGD-2004) and 《highway bridge design general specification》(JTGD-2004) of. This design is standard 20 m span standard beam bridge; calculation span 19.50 m; structure of beam deck width is 19.96m, with 1.9 m beam height, II class road load. The designed speed the car is 20 km/h.
The design is mainly consist of king post endogenic force computation , the stress steel bar arrangement, king post section intensity and stress checking calculation, the inter force calculation of the lane board, the loss of pre-stressed reinforcing steel bar, the calculation of the main girder deformation, the computation of partial compression of the of the anchorage and so on designs. The design use the appropriate method and the computation result has confirmed to the requirement perfectly.
Keyword: simple support T beam bridge；pre-stressed concrete structure； post-tensioning method；prestressed reinforcement layout；the inter force calculation of the lane board
目录
1 课题综述 1
1.1 课题的目的和意义 1
1.2 国内外研究现状与水平 1
1.3 发展趋势 2
2 调研情况 3
2.1 悬索桥 3
2.2 预应力空心板桥 3
2.3 预应力混凝土简支梁桥 4
2.4最佳方案的确定 4
3 设计资料和结构尺寸 5
3.1 设计资料 5
3.2 横截面布置 5
3.2.1 主梁尺寸拟定 7
3.2.2 主梁截面几何特性计算 5
3.2.3 主梁间距和主梁片数 6
4 主梁内力计算 9
4.1 恒载内力计算 9
4.1.1 恒载集度 9
4.1.2 恒载内力 10
4.2 活载内力计算 12
4.2.1 支点截面的荷载横向分布系数 12
4.2.2 跨中的荷载横向分布系数 13
4.3人群荷载内力计算 20
4.4 主梁内力组合 21
4.5 弯矩和剪力图 22
5 预应力钢束的估算及其布置 24
5.1 预应力钢束的估算与确定 24
5.1.1 按使用阶段的应力要求估算钢束数 24