1、 毕业设计毕业设计 题题 目:目:35m35m 预应力混凝土简支预应力混凝土简支 T T 型梁桥设计型梁桥设计 (净(净- -7+27+20.75m0.75m 人行道)人行道) 指导教师:指导教师: 职称:职称: 教授教授 2012 年 6 月 1 日 摘要 I 摘要 本设计依据 2004 年新规范设计一座 35 米预应力混凝土 T 形简支梁桥, 设计中汽车荷 载采用公路级设计,人群荷载取标准值。该桥标准跨径 35 米,计算跨径 33.88 米,主 梁预制长度 34.96 米,桥面宽为净 7+20.75m,采用 4 片主梁,间距 2.1m,梁高 2.2m, 设 5 道横隔梁,翼缘板采用刚结,预
2、应力筋采用 12 束 24 丝 # 5 碳素钢丝,后张法施工, 各主梁配筋及布置相同。 本设计书共包括以下内容: 1.纵横断面设计 根据规范要求确定主梁间距与主梁片数和主梁高度及各截面主要尺寸. 2. 主梁设计 主梁设计首先进行内力计算, 主要由恒载内力和活载内力计算组成.内力计算完成后, 根据所算出的内力对预应力钢束数进行估算, 进行配筋, 然后对钢束进行预应力损失计算, 最后对主梁进行强度,应力和变形验算. 3. 横隔梁设计 设置横隔梁是为了保证各主梁共同受力和加强结构整体性,本设计中采用偏心压力法 进行横隔梁计算.鉴于桥梁跨中处横隔梁受力最大,只计算跨中横隔梁内力,其余横隔梁可 依据中横
3、隔梁偏安全选用相同的截面尺寸和配筋. 4. 行车道板设计 本设计中行车道板的受力图式为单向板,经过内力计算后选择行车道板尺寸 5. 支座设计 由设计的具体条件选择采用板式橡胶支座。 关键词: 预应力混凝土、T 型梁、后张法。 Abstract II ABSTRACT The design is a 35-meter prestressed concrete simply supported T-beam bridge based on the design of the new rules in 2004,with the motor vehicles using the road load
4、level , and the crowd load is from the standard value. The bridge span designed is 35 meters, and the calculation long-span is 33.88 meters, the main girder length is 34.96 meters, the prefabricated of bridge wide is net7+2 0.75m.The bridge uses five main girder with spacing 1.6m, and the beam is 2.
5、2m high . There are 5 crossing beam located in the bridge, the beam flange plate uses just guitar, and the pretesting force muscle adopts12charcol plain steel wire5 ,the construction uses post-tensioned, the main beam reinforcement and layout is the same. A total of this design includes the followin
6、g content: 1. The arrange of longitudinal section and lateral section To identify the main beam and girder spacing and the main beam of a few films and a high degree of cross-section main dimensions in accordance with regulatory requirements 2. Main beams design First of all, the main beam design is for the calculation of internal forces, primarily calculated composing by cross-contained set of internal forces and internal force. after Internal force calcul