腐蚀疲劳钢筋混凝土梁正截面应变分析  

Cross-section strain analysis of reinforced concrete beam subjected to corrosion fatigue

作　　者：王海超[1] 何世钦[2] 贡金鑫[3] 

机构地区：[1]山东科技大学矿山灾害预防控制省部共建教育部重点实验室,山东青岛266510 [2]清华大学水利水电工程系,北京100084 [3]大连理工大学土木水利学院,辽宁大连116023

出　　处：《建筑结构学报》2007年第3期105-109,121,共6页Journal of Building Structures

基　　金：国家自然科学基金资助项目(50078009);山东省教育厅基金资助项目(J05N01)

摘　　要：通过钢筋混凝土梁的腐蚀疲劳试验和对比试验,根据实测的试验梁在循环荷载作用下正截面上钢筋和混凝土的动态应变,分析了正截面钢筋和混凝土的应变发展过程。结果表明,在腐蚀环境中,钢筋的拉应变由于腐蚀介质的作用增长率加大,而且是一种不间断的连续增长。不同腐蚀环境中的应变发展过程相似,但应变增长率不同,随着腐蚀环境的不同而变化。在腐蚀环境相同的情况下,受疲劳荷载水平控制;在疲劳荷载水平相同的情况下,受不同的腐蚀环境作用控制。正截面上的应变发展过程同样有三个不同的阶段,即初始阶段、发展阶段和破坏阶段。其结果可以为腐蚀疲劳钢筋混凝土构件的耐久性设计提供参考。The experiments of reinforced concrete beams subjected to corrosion fatigue and the control beams were carried out. Based on the measured values of dynamic reinforcement strain and concrete strain in the cross-section of the reinforced concrete beam subjected to cycling loading, the strain developing process was analyzed. The results show that the increasing rate of the reinforcement tensile strain was accelerated in corrosion environment due to corrosion medium effects and the increasing process was a continuous process. The strain development is similar in the different environment, whereas the developing rate is different in various erosion environment. The increasing rate of strain is controlled by the level of fatigue loading in the same corrosion environment and is determined by the intensity of corrosion effects in the same fatigue loading level. The strain development process of the cross-section is also divided into three stages, the initial stage, the development stage and the failure stage. The results may provide the reference for the durability design of reinforced concrete members subjected to corrosion fatigue.

关 键 词：腐蚀环境 循环荷载 腐蚀疲劳 动态应变分析 

分 类 号：TU375.1[建筑科学—结构工程]