文档介绍：上海交通大学
硕士学位论文
连续刚构桥纵向预应力筋优化设计研究
姓名:金凤温
申请学位级别:硕士
专业:建筑与土木工程
指导教师:寇新建;段树金
20050901
上海交通大学工程硕士学位论文连续刚构桥纵向预应力筋优化设计研究
连续刚构桥纵向预应力筋优化设计研究
摘要
本文针对连续刚构桥的悬臂施工过程及受力特点,提出一种预应力优化设计
的方法。其设计思想是根据悬臂施工阶段按 T 构弯矩平衡配置静定束,成桥阶段
按正截面最不利应力配置后期束,按斜截面最不利主拉应力配置抗剪竖向预应力
钢筋。
以京珠国道主干线广州(新洲)至番禺(坦尾)段高速公路上的观音沙大桥
为
工程背景,根据施工过程,考虑混凝土的收缩徐变的影响,对静定束在最大悬臂
状态、运营阶段、成桥徐变三年下弯和不下弯两种情况进行了分析对比,结果表
明静定束全部采用直束是完全可行的;在满足于施工过程中的受力情况下,对于
底板连续束的布置范围进行了研究,在 ~ 倍的跨度内设置合适长度的连续
束来调整合拢后及运营阶段结构的受力状态,使桥梁结构的受力更合理;在箱梁
的顶底板上,恰当的选择大吨位锚具,由于孔束减少不但给施工带来方便,而且
可以减小构件厚度尺寸从而减轻自重,达到良性循环;结合构造要求从受力情况
来分析,长束尽量布置在最外侧,使其充分发挥对各个施工阶段的作用,通过短
束调整各特殊情况下所引起的受力变化。
关键词:连续刚构,预应力优化,设计
上海交通大学工程硕士学位论文连续刚构桥纵向预应力筋优化设计研究
STUDY ON OPTIMUM DESIGN OF LONGITUDINAL
PRESTRESSED TENDONS FOR CONTINUOUS RIGID
FRAME BRIDGE
ABSTRACT
In this paper, based on the cantilevered construction characteristics
of continuous rigid frame bridge, one optimization method of
prestressing tendon was presented. The idea of design is that statically
determinate prestressing tendons are set to counteract against bending
moment induced by gravity in cantilevered construction stage,
continuous prestressing tendons are set based on worst stress on section
pletion of bridge stage, vertical prestressing tendons are set on
the basis of the worst principal tensile stress on inclined cross-section.
Taking Guan Yin Sha bridge on express highway from GuangZhou
to PanYu of main highway from Beijing to Zhuhai as engineering
background, considering construction process and shrinkage and creep
of concrete, mechanical behavior of the bridge using linear and curving
statically determinate prestressing tendons have been analyzed at the
stage of longer cantilever, operating stage and three years later
completion of bridge, the results show using wholly linear tendons in
statically determinate prestressing tendons is feasible. furthermore
reasonable length of continuous prestressing tensons in bottom plate of
box se