预应力混凝土简支t型梁桥设计论文_学位论文.doc

大连星海大桥 预应力混凝土简支T型梁桥设计 摘 要 桥是跨越障碍的通道，随着我国城市建设和高等级公路、道路建设的发展，桥梁的建设也将成为必然的趋势。预应力混凝土简支T型梁桥设计在我国公路上修建很多。 本毕业设计内容为预应力混凝土简支T型梁桥设计，结构设计包括对预应力混凝土简支T型梁、墩柱及盖梁的设计和计算，具体计算方法包括荷载横向分布系数计算法、容许应力法。施工组织包括钻孔桩施工、T型梁的预制和架设、支座和伸缩缝施工、以及桥面铺装和栏杆施工以及附属结构的施工等。 设计中参考了《桥梁计算示例集—混凝土简支梁（板）桥》、《公路钢筋混凝土及预应力桥涵设计规范》、《公路桥涵设计通用规范》、《桥梁工程》、《桥梁施工组织管理》等课内外有关资料。 关键词：桥梁，设计，预应力，混凝土 T梁 Abstract Bridge across obstacles corridors, with our urban construction and the high-grade highway, road construction, bridge building will also become the inevitable trend. Pre-stressed Concrete T bridge design teams in the construction of many of our roads. The design elements for Pre-stressed Concrete graduated from T bridge design, structural design, including extensions of Pre-stressed Concrete, and culvert design and calculation, the specific methodology including horizontal distribution of load factor calculations, allowing stress law. Construction organizations, including bored pile construction, and erection of prefabricated T bridge design, secure and joints construction, decking and railings and deck construction and construction subsidiary structure. Specific reference in the design of the bridge of examples Collection - concrete extensions (board) Bridge, and Highway design of reinforced concrete and pre-stressed norms, road tunnels designed generic norms, bridge project, bridge construction organization and management classes and outside information. Key words: bridge，design， pre-stress，concrete，T bridge目 录 摘 要 I Abstract Ⅱ 一 绪论 1 二 方案比选 3 2.1方案编制 3 2.2 推荐方案 4 三 上部结构设计 5 3.1 设计资料及构造布置 5 3.1.1 设计资料 5 3.1.2 横截面布置 7 3.1.3 横截面沿跨长的变化 11 3.1.4 横隔梁的设置 11 3.2 主梁作用效应计算 11 3.2.1 永久作用集度 11 3.2.2 可变作用效应计算 14 3.2.3 主梁作用效应组合 22 3.3 预应力钢束的估算及其布置 23 3.3.1 跨中截面钢束的估算和确定 23 3.3.2 预应力钢束布置 24 3.4 计算主梁几何截面特性 30 3.4.1 截面面积及惯矩计算 30 3.4.2 截面净矩计算 33 3.4.3 截面几何特性汇总 34 3.5 钢束预应力损失计算 36 3.5.1 预应力钢束与管道壁之间的摩擦引起的预应力损失 37 3.5.2 由锚具变形、钢束回缩引起的预应力损失 38 3.5.3 混凝土弹性压缩引起的预应力损失 39 3.5.4 由钢束应力松弛引