土木工程论文编号:TM001 论文字数:22593,页数:104
目 录 第1章 概 述........................................................................ 1 1.1 设计资料........................................................................ 1 1.1.1 设计资料及构造布置 .............................................................1 1.1.2 施工方法 .......................................................................2 1.1.3 设计依据 .......................................................................2 1.2 设计特点........................................................................ 2 第2章 桥梁结构总体布置................................................................4 2.1 立面布置........................................................................ 4 2.2 截面布置........................................................................ 4 2.2.1 截面形式........................................................................4 2.2.2 主梁跨中截面主要尺寸拟定........................................................4 2.2.3 主梁间距和主梁片数..............................................................5 2.2.4 横截面沿跨长的变化..............................................................6 2.2.5 横隔梁的设置 ...................................................................6 2.2.6 主梁尺寸计算....................................................................7 第3章 结构内力计算....................................................................12 3.1 主梁内力计算 .....................................................................12 3.1.1 预制主梁自重（第一期恒载）......................................................12 3.1.2第二期恒载.......................................................................13 3.2 活载内力计算 .....................................................................14 3.2.1 活载冲击系数....................................................................14 3.2.2 车道折减系数....................................................................14 3.2.3 计算活载内力 ...................................................................19 第4章 预应力钢束估算及其布置 .........................................................24 4.1预应力钢束的估算 ..................................................................24 4.1.1钢绞线及锚具 ....................................................................24 4.1.2 跨中截面的钢束估算与确定........................................................24 4.1.3 支点截面所需抵抗负弯矩的上部预应力钢束的估算结合确定 ...........................25 4.2 预应力钢束的布置 .................................................................26 4.2.1 连续梁预应力钢束的配置原则......................................................26 4.2.2 跨中截面钢束布置 ...............................................................27 4.2.3 锚固截面的钢束布置..............................................................27 4.2.4 钢束起弯角和线形的确定 .........................................................28 4.3 钢束计算..........................................................................29 4.3.1钢束起弯点到跨中截面的距离计算 ..................................................29 4.3.2 控制截面的钢束重心位置计算......................................................29 4.3.3 钢束长度计算....................................................................31 第5章 计算主梁截面几何特性............................................................33 5.1 截面面积及惯矩计算................................................................33 5.1.1 净截面几何特性计算..............................................................33 5.1.2 换算截面几何特性计算............................................................33 5.2 各阶段截面对重心轴的静矩计算......................................................36 第6章 次内力的计算....................................................................43 第7章 钢筋预应力损失计算..............................................................45 7.1 预应力钢筋与管道壁之间的摩擦......................................................45 7.2 由锚具变形、钢筋回缩和接缝压缩引起的预应力损失（考虑反摩擦）......................46 7.3 混凝土的弹性压缩损失..............................................................48 7.4 由预应力钢筋松弛引起的应力损失....................................................49 7.5 混凝土的收缩和徐变引起的损失......................................................50 第8章 主梁截面强度与应力验算..........................................................53 8.1 持久状况承载能力极限状态计算......................................................53 8.1.1 正截面抗弯承载能力验算..........................................................53 8.1.2 斜截面抗弯强度验算..............................................................59 8.1.3 斜截面抗剪承载力验算 ...........................................................59 8.1.4 局部承压验算 ...................................................................64 8.2 持久状态正常使用极限状态计算......................................................66 8.2.1 抗裂验算........................................................................66 8.2.2 挠度验算 .......................................................................74 8.3 持久状况构件的应力计算............................................................76 8.3.1 受压区混凝土最大压应力和受拉区预应力钢筋最大拉应力验算..........................76 8.3.2 混凝土的主压应力验算............................................................83 第9章 行车道板计算....................................................................85 9.1 悬臂板荷载效应计算 ...............................................................85 9.1.1 恒载效应........................................................................85 9.1.2 活载效应........................................................................87 9.2 连续板荷载计算....................................................................88 9.2.1 恒载效应........................................................................88 9.2.2 活载效应........................................................................90 9.2.3 荷载组合........................................................................92 9.3 截面设计配筋与强度验算 ...........................................................92 致 谢.................................................................................94 参考文献 .............................................................................95 附 录 1...............................................................................96 附 录2 ..............................................................................102 第1章 概 述 1.1 设计资料 题目：7*30m公路预应力混凝土连续梁桥上部结构设计 1.1.1 设计资料及构造布置 1. 设计资料 桥孔布置形式：7-30=210m 标准跨径：30m；梁长：29.90m；计算跨径：29.20m 桥宽：为分离式 左右幅均为12.25m 净—11.25m 设计荷载：公路—Ⅰ级
