摘要
为了确定在一致地震作用下独塔斜拉桥的合理抗震约束体系,本文首先对独塔斜拉桥在纵桥向和横桥向约束体系的传力机理进行了研究,然后以松花江大桥为研究对象,采用非线性时程分析方法,分析了墩、梁以及塔梁的纵向约束体系和横向约束体系对独塔斜拉桥地震反应的影响。分析表明,考虑支座滑动摩擦能显著减少独塔斜拉桥主梁和主塔的纵向位移,降低塔底的弯矩;由于独塔斜拉桥的主塔在横桥向对主梁的强大约束作用,边跨过渡墩和辅助墩的横向约束体系与主跨主梁的横向约束体系相互影响很小。
In order to find out the appropriate seismic constraint system for simple-tower cable-stayed bridges under consistent earthquake, principle of distributing the inertia forces longitudinally and tranverslly was analysed firstly. Then the seismic responses of simple-tower cable-stayed with different longitudinal constraint systems and lateral constraint systems between piers or tower and girder were calculated by taking the songhuajiang highway bridge as a studying object, and using the nonlinear time-history analysis method. The results indicate that, for simple-tower cable-stayed bridges, greatly reduce the longitudinal displacement of the girder and tower, and the moment at the bottom of the tower can be reduced greatly considering the sliding friction owing to large lateral constraint of tower to girder, lateral constraint systems of side-span piers have less influence on the girder of main-span, vice verse.
出处
《结构工程师》
2008年第6期29-35,共7页
Structural Engineers
关键词
独塔斜拉桥
约束
阻尼器
simple-tower cable-stayed bridge, constraint, damper
