5×40m预应力混凝土简支箱梁桥计毕业设计.doc

学校代码 10126 学号 007290 分 类 号 密级 本科毕业论文（设计） ×40m预应力混凝土设计 学院、系 专业名称 年 级 学生姓名 指导教师 2011年5月21日 作用下的扭矩计算。 对于平面弯曲计算，通常可用熟知的材料力学公式，计算各横截面上的弯曲正应力和弯曲剪应力。对于扭转计算，一般来说，箱形薄壁杆件受扭后横截面将产生自由扭转剪应力，约束扭转正应力与剪应力以及截面发生歪扭引起的畸变正应力与剪应力。但根据经验，箱梁剪力滞，翘曲，扭转，以及畸变产生的应力都较小，可以乘以相应的系数得到，截面内力于活载作用力之和作为箱型梁的计算活载内力。 根据所得内力，进行了梁的预应力钢筋估算，估算了钢绞线的各种预应力损失，并进行预应力阶段和使用阶段主梁截面的强度和变形验算、挠度的计算。下部结构采用以钻孔灌注桩为基础的双柱式桥墩。 关键词：预应力混凝土、简支梁桥、钻孔灌注桩、夹片锚具、AutoCAD。 Abstract：This is a partial struct design of a flyover crossing that is over the railway inN, according to designing assignment and the standard of road and bridge. For the purpose of make the type of the bridge corresponding with the ambience and cost saving, this paper provides two different types of bridge for selection: the first one is pre-stressed concrete continuous bridge; the second one is double cantilever half through no-thrust arch bridge. After the comparisons of economy, appearance, characteristic under the strength and effect, the first one is selected. In this design, The checking calculation of strength of main girder was preceded not only in prestressed statement but also in using statement, deflection,precamber and the assessment of reinforcing steel bar were checked too. The pier of the bridge was basing on digging pile, and adopted rubber pot bearing. According to the characteristic of the overpass bridge and spot condition, it adopted the method that the cantilever job placing combined with bracket job placing. All of the design drawings were protracted by AutoCAD. Except that the thesis called A note on dynamic fracture of the bridge bearing due to the great Hanshin–Awaji earthquake was translated into Chinese, and made a report on. Keywords: prestressed concrete、AutoCAD、simple supported beam bridge、cast-in-place pile、cone anchora