I
目录
摘要.......................................................................................................................................IV
ABSTRACT...............................................................................................................................V
第 1 章 设计资料及构造布置 ................................................................................................1
1.1 设计资料..............................................................................................................................1
1.1.1 桥梁跨径及桥宽 ...........................................................................................................1
1.1.2 设计荷载 .......................................................................................................................1
1.1.3 材料工艺 .......................................................................................................................1
1.1.4 设计依据 .......................................................................................................................1
1.1.5 基本计算数据 ...............................................................................................................2
1.2 横截面布置..........................................................................................................................3
1.2.1 主梁间距与主梁片数 ...................................................................................................3
1.2.2 主梁跨中截面主要尺寸拟定 .......................................................................................4
1.3 横截面沿跨长变化 ..............................................................................................................6
1.4 横隔梁设置..........................................................................................................................6
第 2 章 主梁作用效应计算 ....................................................................................................7
2.1 (边主梁)永久作用效应计算 ..........................................................................................7
2.1.1 永久作用集度 ................................................................................................................7
2.1.2 永久作用效应 ...............................................................................................................8
2.2 可变作用效应计算(修正刚性横梁法) ..........................................................................9
2.2.1 冲击系数和车道折减系数 ...........................................................................................9
2.2.2 计算主梁的荷载横向分布系数 .................................................................................10
2.2.3 车道荷载的取值 .........................................................................................................14
2.2.4 计算可变作用效应 .....................................................................................................14
2.3 主梁作用效应组合............................................................................................................17
第 3 章 预应力钢束的估算及其布置 ...................................................................................19
3.1 跨中截面钢束的估算和确定 ............................................................................................19
3.1.1 正常使用极限状态 .....................................................................................................19
3.1.2 承载能力极限状态 .....................................................................................................19
3.2 预应力钢束布置 ................................................................................................................20
3.2.1 跨中截面及锚固端截面的钢束位置 ..........................................................................20
3.2.2 钢束起弯角和线形的确定 .........................................................................................21
3.2.3 钢束计算 .....................................................................................................................21
第 4 章 计算主梁截面几何特性...........................................................................................25
4.1 截面面积及惯矩计算 ........................................................................................................25
4.1.1 净截面几何特性计算 .................................................................................................25
4.1.2 换算截面几何特性计算 .............................................................................................25
4.2 截面净矩计算....................................................................................................................26
4.3 截面几何特性汇总............................................................................................................29
第 5 章 钢束预应力损失值 ..................................................................................................30
5.1 预应力钢束与管道壁之间的磨擦引起的预应力损失.....................................................30
5.2 由锚具变形、钢束回缩引起的损失 ................................................................................30