目录烟台大学毕业设计任务书....................................................i摘要....................................................................vi第1章方案比选.........................................................11.1桥梁设计原则.....................................................11.2各种桥梁的特点...................................................11.3方案比选.........................................................21.4截面形式比选.....................................................3第2章设计资料及构造布置...............................................42.1设计资料.........................................................42.1.1桥跨及桥宽................................................42.1.2设计荷载..................................................42.1.3材料及工艺................................................42.1.4设计依据..................................................42.2横截面布置.......................................................42.2.1主梁间距与主梁片数........................................42.2.2主梁跨中截面主要尺寸拟定..................................52.2.3计算截面几何特性..........................................62.2.4检验截面效率指标（希望在0.5以上）....................72.3横隔梁的设置.....................................................8第3章主梁作用效应计算.................................................93.1永久荷载效应计算.................................................93.1.1永久计算集度..............................................93.1.2永久作用效应..............................................93.2可变作用效应计算................................................113.2.1冲击系数和车道折减系数...................................113.2.2计算主梁的荷载横向分布系数...............................113.2.3车道荷载的取值...........................................163.2.4计算可变作用效应.........................................173.2.5主梁内力组合.............................................18第4章预应力钢束估算及其布置..........................................194.1跨中截面钢束的估算..............................................194.1.1按正常使用极限状态的应力要求估算钢束数...................194.1.2按承载能力极限状态估算钢束数.............................194.2跨中截面及锚固端截面的钢束位置..................................204.3钢束起弯角和线形的确定..........................................214.4钢束计算........................................................224.4.1计算钢束起弯点至跨中的距离...............................224.5钢束长度计算....................................................23第5章计算主梁截面几何特征............................................255.1截面面积及惯性计算..............................................255.1.1净截面几何特性计算.......................................255.1.2换算截面几何特性计算.....................................26第6章钢束预应力损失计算..............................................336.1预应力钢束与管道壁之间的摩擦引起的预应力损失....................336.2由锚具变形、钢束回缩引起的预应力损失............................346.3分批张拉时混凝土弹性压缩引起的预应力损失........................356.4由钢束应力松弛引起的预应力损失..................................356.5混凝土收缩和徐变引起的预应力损失................................366.6钢束预应力损失汇总..............................................39第7章承载能力极限状态计算.....
