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1、精选优质文档-倾情为你奉上摘要预应力混凝土连续箱梁桥优点很多，比如构造过程中整体刚度较大，动力性能良好，施工过程中工期较短，同时主梁挠曲变形相对较小，这样对行车速度要求较高，通常适用于高速公路。另外，就先简支后转连续施工方法而言，由于其成桥后，在支点会产生负弯矩，对跨中的正弯矩进行了平衡，从而提高了桥梁整体稳定性与耐久性，比普通的简支梁桥受理更均匀更合理。目前在大多高速公路桥中应用极其广泛。 本设计主梁采用预应力混凝土连续箱梁，对主桥430 m连续箱梁进行了基本的设计。拟建该大桥正跨马跑沟河，为“U”字形河谷，工程地质分区属于冲洪积平原地质区，桥址区域位于管子沟河道及两岸，河道两岸地势较为开阔
2、，地形较为平坦，河道沟道较深。本设计一开始先对桥址资料包括水文、地质、气象进行描述，同时查阅了其适用的设计技术标准以及材料的选取，随即确定了设计方案及施工方法。结构设计过程大致如下：截面尺寸的拟定，每跨各个控制截面的内力及其各类组合的计算汇总，估束及布筋（预应力钢筋），对承载能力极限状态进行承载能力验算，对正常使用极限状态进行构件抗裂性及变形验算，对持久状况和短暂状况进行构件截面应力验算等。其中，钢束布置时，由于使用的是Midas软件建模，故一片中梁边跨共设36根15.2钢绞线，即N1每束设5根，N2、N3、N4每束均设4根，且N1、N2、N3、N4均设为2束；中跨跨中共设32根钢绞线，即N1
3、、N2、N3、N4每束均设5根，且N1、N2、N3、N4均设为2束；中支点共设52根钢绞线，即T1、T3每束均设4根，T2每束设3根，且T1、T2设为2束，T3设为3束。验算后得知，主梁设计结构安全，并满足公路桥梁规范的各项要求。关键词：预应力；连续箱梁；先简支后转连续AbstractPrestressed concrete continuous box girder bridges has many advantages, such as greater overall stiffness during construction, good dynamic performance, the
4、construction process shorter duration, while the main beam deflection is relatively small, so the higher speed of traffic requirements, generally applicable on the highway. In addition, on the simply supported - continuous construction method, since it a bridge, at the fulcrum will produce negative
5、moment, cross the positive moment was balance, thereby improving the overall stability and durability of the bridge, Charpy than ordinary bridge accept more uniform and reasonable. Currently the most telling highway bridge in applications is extremely broad.The design of the main beams of prestresse
6、d concrete box girder, the main bridge 4 30 m continuous box girder made the basic design. The proposed bridge being Kuama ditch run for the U shaped valley, engineering geological zoning belong to the alluvial plain of the geological area, the bridge site area is located on the river and on both si
7、des of the pipe ditch, river sides more open terrain, the terrain is relatively flat, river deeper channel. The design of a bridge began on the first site information, including hydrology, geology, meteorology description, check the design of its applicable technical standards and the selection of m
8、aterials, then determine the design and construction methods. Structural design process is as follows: a cross-sectional size of the formulation, calculated across a broad cross-section of the internal forces to control its various combinations of each summary, estimates and fabric reinforcement bea
9、m (prestressing steel), for the ultimate limit state checking the bearing capacity of normal limit state member crack resistance and deformation analysis of the situation and short lasting section stress member status checking and so on. Wherein, when the steel beam arrangement, as is the Midas soft
10、ware modeling, it is a center sill side span a total of 36 15.2 strand, which is located 5 per tow N1, N2, N3, N4 are located four per bundle, and N1, N2, N3, N4 are set to 2 bundle; cross cross Party set up 32 strands, namely N1, N2, N3, N4 are located 5 per bundle, and N1, N2, N3, N4 are set 2 bun
11、dle; fulcrum total of 52 strands, namely T1, T3 are located four per bundle, T2 located 3 per bundle, and T1, T2 to 2 beams, T3 is set to 3 bundles. After checking that the main design of the structural safety of the beam, and to meet the requirements of highway bridge specification. After checking
12、that the main design of the structural safety of the beam, and to meet the requirements of highway bridge specification.Keywords: Prestressed; Continuous box girder; Simple Support - Continuous专心-专注-专业目录毕设总结.77致谢.781. 桥址资料1.1 地质、地形、水文及气象资料全称是营盘水至双塔高速公路，是国家高速公路网青岛至银川高速公路山西定边至武威联络线的重要组成路段，是京拉高速公路与连霍高速
13、公路的连接线，也是甘肃省高速公路网规划的重要路段。路线全长157.56公里，全线采用四车道高速公路技术标准，设计速度为80公里/小时，路基宽度25.5米。全线设互通式立交5处（预留1处），分离式立交11处。起点位于甘宁交界的白银市景泰县营盘水，途径景泰县城、景泰县寺滩乡、古浪县裴家营、大靖镇、土门镇，终点位于武威市古浪县泗水镇双塔，与甘肃省永古高速公路相连。营双高速公路建成后不仅对地处西北的甘肃、宁夏、新疆、青海及内蒙古等地的公路网建设具有重要的作用，而且将成为西北与华北、东北各省市的一条纽带。营双高速公路建成后，从方向前往等地的车辆将能减少190公里左右的路程。营双高速公路是甘肃省第一条在沙
14、漠地带修建的高速公路。项目全线位于与交界的和祁连山余脉向过渡地带。同时，线路位于祁连山与南北地震带的景泰地震亚带，是我国重点监视的主要地震活动区域之一。该大桥桥址区位于管子沟河道及冲沟两岸，工程地质分区属于冲洪积平原地质区，桥址区地层岩性较为简单，主要有第四系冲洪积粉细砂、黄土、角砾。沟底出露角砾层（稍湿，青灰色，中密多呈棱角、片状，骨料成分以变质砂岩、板岩碎屑为主）。另外，河道两岸地势较为开阔，地形较为平坦，河道沟道较深，海拔高程1728-1751m左右，相对高差23m，沟宽约180m。设计流量978,河床平时干涸无水，只有在暴雨季节有短暂性洪水，桥梁跨径设置可依地形控制，不受流量影响。而冲
15、沟两岸出露冲洪积粉细砂（浅黄色，稍湿，中密，具有层理，多与黄土以互层形式出现），冲洪积黄土（浅黄色，硬塑-坚硬，土质不均匀，多与粉细砂以互层形式出现）。1.2 设计技术标准1. 设计荷载：公路级荷载；2. 设计洪水频率：1/100。3. 桥面净宽：2净-10.75m4. 设计车道：单幅3车道。5. 地震烈度：地震峰值加速度为0.20g，地震烈度等级为7度。6. 桥面横坡：双向 2%横坡。1.3 材料选用1. 混凝土：选用C50混凝土构件类型如下：预制主梁、端横梁、跨中横隔板、中横梁以及桥面现浇层；选用沥青混凝土：桥面铺装。2. 普通钢筋：选用R235和HRB335两种类型钢筋。若钢筋直径，则用HRB335热轧带肋钢筋；若钢筋直径，则用R235钢筋。3. 预应力钢筋：选取抗拉强度标准值、公称直径的低松弛高强度钢绞线。4. 桥面铺装: 桥面现浇层选用8厚C50混凝土，防水层选用10厚沥青混凝土。1.4 施工方法施工方法：先简支后转连续施工法施工要点：施工过程工艺及其质量检验标准，均参照公路桥涵施工技术规范（JT J041-2000）中相关规定。然而，根据上部
