铁道标准设计2018，Vol.62Issue(5)：67-71,115,6.DOI:10.13238/j.issn.1004-2954.201706180004
铁路梁桥在多因素腐蚀环境影响下构件抗弯性能研究
Research on Flexural Performance of Railway Beam Bridge under Multi Factor Corrosion Environment
董伟1
作者信息
- 1. 兰州铁道设计院有限公司,兰州 730000
- 折叠
摘要
Abstract
In order to understand the effects of various corrosive factors on the bending behavior of bridge structures in Xi-Ge railway special line,this article analyzes respectively the influences of water,carbon dioxide concentration and chlorine ion on tensile strength, effective tensile area, concrete carbonization and the bond strength between two kinds of concrete. Based on the cooperative relationship between the corroded reinforcement and the concrete,the formula for calculating the flexural capacity of the corroded reinforced concrete members is derived by constructing new geometrical condition, and the influence of corrosion degree of the reinforcement on the flexural performance of structures is analyzed. The study results show that reinforced concrete members under long time corrosive environment tends to reduce the tensile strength of the reinforcement continuously, the effective tensile area decreases continuously, the concrete carbonation intensifies and the bonding property is reduced. By constructing the strain relationship between the corroded reinforcement and the concrete, the formula for calculating flexural capacity of corroded reinforced concrete members can better reflect the calculation characteristics of structures. With the increase of corrosion degree of reinforcement, the loss rate of flexural bearing capacity of component is also increasing. When the corrosion rate reaches 17%, the lost of flexural capacity of the component comes up to 30.33%.关键词
钢筋混凝土构件/腐蚀环境/锈蚀机理/抗弯承载力Key words
Reinforced concrete members/Corrosion environment/Corrosion mechanism/Flexural ca-pacity分类
交通工程引用本文复制引用
董伟..铁路梁桥在多因素腐蚀环境影响下构件抗弯性能研究[J].铁道标准设计,2018,62(5):67-71,115,6.
