大跨连续刚构桥中预应力索布置与长期挠度关系研究

Study on Relationship between Prestressed Cable Arrangement and Long-term Deflection in Long-span Continuous Rigid-frame Bridge

从底板预应力配索与跨中挠度关系的分析入手,明确沿底板布索的形式促进了跨中挠度的发展,而沿直线布置底板索则有利于抑制跨中挠度。进一步通过对实例桥的模型计算,在位移、弯矩、应力等方面在不同工况下对两种布索形式进行比较,得出直线布索较优的结论。

The article analyzes the relationship between the prestressed cable arrangement at bedplate and the deflection in the span,defines the type of cable arrangement along the bedplate to promote the development of the deflection in the span.Therefore,the arrangement of cable straightly along the bedplate is propitious to restrain the deflection in the span.The article compares two types of cable arrangement under the different construction conditions in the aspects of displacement,bending moment and stress further by the model calculation of bridge cases.And the conclusion of more optimized straight arrangement of cable is given.