大跨度预应力混凝土连续刚构桥跨中下挠原因分析  

Analysis of the Causes of Midspan Deflection in Long-span Prestressed Concrete Continuous Rigid Frame Bridges

作　　者：黄炜 余健 李晓猛 李懿 宁德飚 HUANG Wei;YU Jian;LI Xiaomeng;LI Yi;NING Debiao(Yunnan Provincial Highway Science and Technology Research Institute,Kunming 650051,China)

机构地区：[1]云南省公路科学技术研究院,昆明650051

出　　处：《科技和产业》2023年第4期254-260,共7页Science Technology and Industry

基　　金：云南省交通运输厅科技创新及示范项目(云交科教编〔2020〕18号)。

摘　　要：在大跨度预应力混凝土连续刚构桥迅速发展的同时,如何有效抑制跨中长期过度下挠成为大跨度预应力连续刚构桥病害防治研究的核心问题。以一座处于服役期间的大跨度预应力连续刚构桥为研究对象,运用有限元软件进行全桥建模,从混凝土长期徐变、底板钢束径向力和钢束预应力损失比3个方面进行分析,讨论各因素所导致的不利状态对大跨度预应力连续刚构桥跨中下挠的影响。In the rapid development of long-span prestressed concrete continuous rigid frame bridges,how to effectively inhibit excessive midspan deflection has become a central issue in the research of disease prevention and control of large span prestressed continuous rigid frame bridges.A long-span prestressed continuous rigid frame bridge in service is used as the object of study.The full bridge is modelled using finite element software,and the effects of the adverse conditions caused by each factor on the deflection in the span of a large span prestressed continuous rigid frame bridge are discussed in terms of long-term concrete creep,radial force in the bottom tendons and loss of prestress in the tendons.

关 键 词：连续刚构桥 长期挠度 徐变 钢束径向力 预应力损失 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]