体外横张预应力在连续刚构桥后期挠度调控中的应用

Application of Continuous Rigid-frame Bridge's Deflection Regulated by External Vertically Tensioned Prestress

针对连续刚构桥跨中下挠病害,在分析常规体外预应力优、缺点的基础上提出了体外横张预应力调控连续刚构桥挠度的新构思,并介绍了其施工要点、流程及优点,推导了其预应力钢束的张拉控制力、预应力损失计算公式。为连续刚构桥的跨中下挠调控提供了一种新的方法。

For the midspan sag of continuous rigid-frame bridge,scheme of using vertically tensioned prestressed techniques to regulate is proposed according to the features of external prestress on the basis of analysis of its advantages and disadvantages.This paper introduces the construction key point,construction process and advantages of vertically tensioned prestressed techniques.Formula of tensioning force and prestress loss are deduced.It provides a new approach for midspan sag of continuous rigid-frame bridge regulated by external vertically tensioned prestress.