文档介绍：midas Civil 2010 斜拉桥专题—斜拉桥设计专题 Integrated Solution System for Bridge and Civil Strucutres 目录?二、斜拉桥索力调整理论?一、斜拉桥概述 ············································ 4 ································· 7 ············································ 7 ····································· 7 ?三、 midas Civil 中的斜拉桥功能目录?四、斜拉桥分析例题 ······················································ 7 2. 斜拉桥成桥分析········································· 7 ········································ 11 ········································· 7 ········································· 7 midas Civil 201 0 斜拉桥专题—斜拉桥分析专题斜拉桥 4 一、斜拉桥概述斜拉桥的上部结构是由梁、索、塔三个主要部分组成,它是一种桥面体系以加劲梁受压(密索)或受弯(稀索)为主,支承体系以斜索受拉及桥塔受压为主的桥梁。 1956 年,瑞典建成的 Stroemsund 桥拉开了现代斜拉桥建设的序幕。随后斜拉桥建设如雨后春笋般蓬勃发展, 其跨径已经进入以前悬索桥适用的特大跨径范围。 midas Civil 201 0 斜拉桥专题—斜拉桥分析专题斜拉桥 5 二、斜拉桥索力调整理论斜拉桥不仅具有优美的外形,而且具有良好的力学性能,其主要优点在于:恒载作用下, 拉索的索力是可以调整的。斜拉桥可以认为是大跨径的体外预应力结构。在力学性能方面,当在恒载作用时,斜拉索的作用并不仅仅是弹性支承,更重要的是它能通过千斤顶主动地施加平衡外荷载的初张力,正是因为斜拉索的索力是可以调整的,斜拉索才可以改变主梁的受力条件。活载作用下,斜拉索对主梁提供了弹性支承,使主梁相当于弹性支承的连续梁。由此可见,对于斜拉桥而言,斜拉索的初张力分析是非常重要的。张拉斜拉索时,实际上已经将该斜拉索脱离出