桥梁工程毕业设计
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目录
1 方案拟定与比选 .....................................................................................................................3
1.1 概述 ...............................................................................................................................3
1.2 方案比选 .......................................................................................................................3
2 主梁内力计算 .........................................................................................................................8
2.1 主要技术指 ...................................................................................................................8
2.1.1 材料规格 .............................................................................................................8
2.2 梁截面尺寸拟定 ...........................................................................................................8
2.2.1 主梁梁高 .............................................................................................................8
2.2.2 顶板和底板 .........................................................................................................9
2.2.3 腹板 .....................................................................................................................9
2.2.4 桥面铺装及栏杆 .................................................................................................9
2.2.5 下部结构尺寸拟定 .............................................................................................9
2.2.6 主梁分段及施工过程 .........................................................................................9
2.3 内力计算 .....................................................................................................................10
2.3.1 截面特性计算 ...................................................................................................10
2.4 结构内力计算 ............................................................................................................. 11
2.4.1 结构自重 ........................................................................................................... 11
2.4.2 可变作用效应 ...................................................................................................15
2.5 作用效应组合 .............................................................................................................19
2.5.1 承载能力极限状态下的效应组合 ...................................................................19
3 预应力钢束设计 ...................................................................................................................27
3.1 钢束估算 .....................................................................................................................27
3.2预应力筋束的布置原则 ..............................................................................................28
3.3 主梁净截面及换算截面特性值 .................................................................................29
3.4 预应力损失及有效预应力 .........................................................................................31
3.4.1 控制应力及有关参数的确定 ...........................................................................31
3.4.2 预应力筋钢与管道壁间摩擦引起的应力损失σl1的计算 .............................31
3.4.3 锚具变形、钢束回缩和接缝压缩一起的应力损失σl3啦的计算 .................32 3.4.4 混凝土的弹性压缩引起的应力损失σl4咯的计算 .........................................33
3.4.5 预应力筋束松弛引起的应力损失σl5计算 .....................................................34
3.4.6 混凝土收缩和徐变引起的应力损失σl6的计算 ...........................................34
3.4.7 预应力损失组合及有效预应计算 ...................................................................35
4 主梁验算 ...............................................................................................................................37
4.1 强度验算 .....................................................................................................................37
4.1.1 正截面抗弯承载能力 .......................................................................................37
4.1.2 斜截面抗剪验算 ...............................................................................................47
4.2 应力验算 .....................................................................................................................47
4.2.1 预应力筋拉应力验算 .......................................................................................47
4.2.2施工阶段法向压应力验算 ................................................................................49
4.2.3 使用阶段正截面压应力验算 ...........................................................................59
4.2.4 斜截面主压应力验算 .......................................................................................63
4.2.5 使用阶段正截面压应力的验算 .......................................................................68
