摘要
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.
出处
《施工技术》
CAS
北大核心
2009年第S2期260-263,共4页
Construction Technology
关键词
连续刚构桥
体外预应力
横张预应力
挠度
调控
张拉力
continuous rigid-frame bridge
external prestres
vertically tensioned prestress
deflection
regulation
tensioned force