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1、摘 要先简支后连续T梁桥是国内一级公路上常用的一种桥梁结构新形式。它施工技术娴熟，行车条件平顺舒适和更简单的养护方法。它还具备了简支梁与连续梁桥的优点。本工程为一座跨径（30m+30m+30m）的预应力钢筋混凝土连续梁桥。 桥梁采用T形等高截面，桥幅为24m，分为两幅，设计时只考虑单幅设计。下部结构采用桩柱式桥墩和重力式桥墩。具体设计如下：首先，进行方案的比选。根据工程地质资料，初步拟定三个设计方案。它们分别为预应力混凝土连续T梁、中承式拱桥及斜腿刚构桥。从安全、适用、经济、美观及环保等方面比选，从中选30m+30m+30m 预应力混凝土连续T梁桥作为最终设计方案。然后是上部结构的设计。通过参
2、考通用图，对主梁的尺寸进行确定。本主梁的设计分为双幅设计，单幅为5片T梁，桥面宽12m，分为3车道。由于两幅受力情况相同，所以整个内力计算和配筋计算，都按单幅来进行。为确保计算的可靠性，除了对截面的强度、抗裂、挠度、持久状况应力状态、短暂状况应力状态进行验算之外，还采用了桥梁博士进行验算。其次，下部结构设计。经过地质分析，采用重力式U型桥台和桩柱式桥墩。参考相关设计图纸，拟定尺寸，其中桥墩台采用1.5m直径的墩柱和1.8m 直径的桩基。然后进行盖梁、墩柱设计计算和验算，对桥台进行强度验算，承载力验算及强度验算。最后，是施工方案的简述。主要介绍总体的施工方案。重点是对扩大基础的施工、墩台施工、主
3、梁的预制及安装流程的介绍。通过上述一系列的设计计算，本设计基本合理，符合规范要求。关键词：预应力混凝土；T形截面连续梁桥；钻孔灌注桩立柱式桥墩；重力式U形桥台ABSTRACT Design of Continuous Simple Supported T-shaped Girder Bridges is a new form of Bridge structure, that be used on the road at the domestic level. It has a skilled Construction, smooth comfortable driving condition
4、s and easier conservation methods. It also has the advantage of the Charpy and the continuous beam bridge. Bridges using T-shaped high section, it width of 24m, and it is divided into two, the design only consider single design. Substructure using piled pier piers and gravity. Specifically designed
5、as follows: First, Selection of the program will be carried out. According to geological data, tentatively three designs, three designs be tentatively set. They were prestressed concrete continuous T beam, the arch bridge and ramps Rigid Frame Bridge. From a security, application, economic, aestheti
6、c and environmental aspects of comparison, Select from 30m +30 m +30 m prestressed concrete continuous T bridge as the final design.Then，it is the design of the superstructure.According to the general map, we determine the dimensions of the main beam. The design of the main beam is divided into doub
7、le-width design, single to 5 T beams, deck width 12m, divided into three lanes. Since the two identical force, the entire force calculation and reinforcement calculations are carried out on the single. In addition to the cross-section strength, cracking, deflection, persistent stress state condition
8、s, transient conditions beyond checking the stress state, Dr. Bridges also incorporates checking to ensure the reliability of the calculation.Secondly, it is the design of the substructure. After geological analysis, it using gravity U-shaped abutments and piled pier. It intended size referencing to
9、 the relevant design drawings which PIERS using 1.5m diameter pier and 1.8m diameter pile. Then design calculations and checking the capping beam and pier, checking the strength of bridge abutment, bearing Capacity and strength checking.Finally, it is a brief description of the construction program.
10、 It describes the overall construction program. It describes focusing on the expansion of basic construction, pier construction, precast Main beam and installation processes.Through all these design calculations, the design is reasonable and in line with regulatory requirements.Keywords: prestressed
11、 concrete; T-shaped section continuous bridge; bored column pier; U-shaped gravity abutment目 录摘 要IABSTRACTII目 录I1 设计资料21.1主要设计技术标准21.1.1设计荷载21.1.2 桥梁宽度21.1.3水位21.1.4地震烈度21.1.5坡度21.1.6材料21.1.7设计规范21.2路线资料31.3桥址纵断面图31.4桥位地质32 方案设计42.1方案一：30m+30m+30m预应力钢筋混凝土T形连续梁桥42.1.1基本设计资料42.1.2主要材料42.1.3基本构造布置及尺寸42
12、.2方案二：90m中承式系杆拱桥42.2.1基本设计资料42.2.2主要材料52.2.3基本构造布置及尺寸52.3方案三：90m预应力钢筋混凝土斜腿刚构桥52.3.1基本设计资料52.3.2主要材料52.3.3基本构造布置及尺寸52.4 方案比选图62.5方案比选表122.6方案的选定123 主梁的设计及计算133.1尺寸选定及几何特性133.1.1尺寸拟定133.1.2 T梁几何特性计算153.1.3检验截面作用效应指标193.2主梁作用效应计算203.2.1结构自重作用效应计算203.2.2汽车荷载作用效应计算283.2.3次内力计算483.2.4内力组合533.2.5电算（桥梁博士）56
13、3.3预应力钢束估算及布置603.3.1钢束估算603.3.2钢束布置663.3.3主梁净、换算截面几何特性计算663.4预应力损失及有效预应力计算683.4.1后张法由预应力筋与管道之间的摩擦引起的应力损失683.4.2后张法由锚具变形、钢筋回缩和接缝压缩引起的应力损失683.4.3后张法由混凝土的弹性压缩引起的应力损失693.4.4后张法由预应力筋束的应力松弛引起的预应力损失终极值703.4.5后张法由混凝土收缩、徐变引起的预应力损失713.4.5截面预应力损失合计和有效预应力723.5配束后主梁内力计算和内力组合733.6截面强度验算763.7抗裂验算773.7.1正截面抗裂验算773.
14、7.2斜截面抗裂验算793.8持久状况构件的应力验算833.8.1正截面混凝土压应力验算833.8.2预应力筋拉应力验算853.8.3混凝土主压应力验算863.9短暂状况构件的应力验算903.9.1预加应力阶段的应力验算903.9.2吊装验算913.10挠度验算913.10.1汽车荷载作用下主梁边跨和中跨的最大截面挠度计算913.10.2温度效应主梁边跨和中跨的最大截面的挠度值923.10.3消除结构自重后长期挠度验算924 下部结构的计算934.1盖梁（墩帽）设计934.1.1设计资料及上部结构资料934.1.2荷载计算934.1.3内力计算1024.1.4盖梁截面配筋与设计校核1054.2
15、墩柱设计1094.2.1荷载计算1094.2.2截面配筋计算及应力验算1114.3挖孔灌注桩的计算1144.3.1荷载计算1144.3.2桩长计算1154.3.3桩的内力计算（m法）1164.4重力式桥台设计1224.4.1设计资料1224.4.2桥台尺寸拟定1224.4.2 荷载布置、支座反力和土压力计算1254.4.3 其他力计算1284.4.4 台身底截面强度验算1294.4.5基础底面地基承载力计算1304.4.6基础稳定性验算1314.4.7沉降量1335 施工方案1345.1 总体施工方案1345.2施工方法1345.2.1基础施工1345.2.2 墩台施工1355.2.3 T梁预制与安装135结 论138致 谢139参考文献140附录1 图纸1 设计资料1.1主要
