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
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二、斜拉桥索力调整理论
一、斜拉桥概述
1. 拉索单元模拟············································4
2. 未知荷载系数法功能·································7
3. 索力调整功能············································7
4. 未闭合配合力功能·····································7
三、midas Civil中的斜拉桥功能
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四、斜拉桥分析例题
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2. 斜拉桥成桥分析·········································7
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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。
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