产生坑蚀后建筑用钢筋S-N曲线中C参数劣化规律的研究  

Study on the deterioration of parameter C in S-N curve of steel bars with corrosionpits used in construction

作　　者：彭修宁[1,2,3] 韦斌凝[1] 薛建阳[4] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]西安建筑科技大学土木工程博士后流动站,陕西西安710055 [3]广西电力工业勘察设计研究院博士后工作站,广西南宁530023 [4]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2009年第5期627-630,662,共5页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：中国博士后科学基金(20080440814);广西大学科学基金(DD030011);广西电力工业勘察设计研究院博士后基金

摘　　要：钢筋的疲劳强度主要决定于最大应力处附近的局部应力情况,因此应力集中处的疲劳强度往往比光滑部分低,常常成为钢筋的薄弱环节,在对32个试件进行试验研究的基础上分析了锈坑(宏电池腐蚀)对钢筋疲劳性能的影响,提出了产生锈坑后建筑用钢筋疲劳S-N曲线中C参数的劣化规律,C值的劣化大致可分为三个阶段:第一阶段钢筋的锈蚀量很小(锈坑深度很浅),C值的下降规律不明显;第二阶段随着钢筋锈坑深度的增长,C值呈线性下降规律;第三阶段当锈坑深度达到一定数值后,C值将有急剧下降的趋势.Steel bars＇ corrosion is one of the most important factors that influence durability of reinforced concrete structures or members. Corroded bars （especially with unsymmetrical corrosion pits） under fatigue loads make deterioration of their own behavior greatly. Experimental research of 32 specimens has been done and the influence of corrosion pits （macro battery corrosion） on fatigue performance of steel bars is studied in this paper. As a result of experimental investigation influence on remained static strength of bars has been analyzed and the deterioration of parameter C in S-N curve of steel bars with corrosion pits used in building construction has been established. This will be used in evaluation on fatigue behavior of corroded bars used in reinforced concrete structures.

关 键 词：锈坑 腐蚀 S-N曲线 疲劳 

分 类 号：TU375[建筑科学—结构工程]