摘要
随着服役时间的增加,混凝土结构中钢筋易发生锈蚀,引起混凝土结构承载性能下降,严重影响工程结构的继续使用。该文在分析纵筋锈蚀后的屈曲效应、箍筋锈蚀后的约束效应、混凝土和钢筋材料性能劣化的基础上,建议了考虑锈蚀影响的钢筋、混凝土及锈蚀钢筋与混凝土界面粘结性能的本构模型,以锈蚀钢筋混凝土柱为研究对象,对反复荷载作用下钢筋混凝土柱的分析模型进行修正,建立了锈蚀钢筋混凝土柱压-剪-弯交互作用下极限承载力计算模型,并通过21根锈蚀混凝土柱的试验结果对建议分析模型进行了验证。研究结果表明:锈蚀钢筋混凝土柱极限承载力试验值与计算值之比的平均值为1.021,方差为0.014,建议模型极限承载力预测值与试验结果吻合较好,可用于低周反复荷载作用下锈蚀钢筋混凝土柱的承载力分析。
With the increasing of their service life,the steel reinforcements in concrete structures are prone to corrosion,which causes the bearing capacity degradation of a concrete structure.Therefore,the corrosion of reinforcing bars greatly affects the use of concrete structures.Based on analyzing the effect of corroded steel reinforcement on buckling,the confinement effect of corroded stirrup and degradation of mechanical properties of concrete and steel,the constitutive models of these materials including steel and concrete along with the bond behaviour between the steel bars and concrete were proposed in many literatures.By selecting the corroded reinforced concrete columns as the research object,an analytical model of peak lateral load capacity of corroded reinforced concrete columns under axial-shear-flexure loading was put forward by modifying the analysis model of reinforced concrete columns subjected to cyclic loading.The proposed model was verified through 21 corroded columns tests.It is believed that a good agreement between test results and prediction results for lateral load capacity is achieved with an average ratio of test results to predicted results of 1.021 and a variance of 0.014 between test results and predicted results.The suggested model can be served as a theoretical method to analyse the load bearing capacity of corroded reinforced concrete columns under cyclic loading.
作者
邢国华
杨成雨
常召群
秦拥军
张广泰
XING Guo-hua;YANG Cheng-yu;CHANG Zhao-qun;QIN Yong-jun;ZHANG Guang-tai(School of Civil Engineering,Chang’an University,Xi’an 710061,China;School of Civil Engineering,Xinjiang University,Urumqi 830046,China)
出处
《工程力学》
EI
CSCD
北大核心
2019年第8期87-95,共9页
Engineering Mechanics
基金
国家自然科学基金项目(51868073)
新疆自治区自然科学基金项目(2018D01C038)
陕西省青年科技新星资助项目(2017KJXX-37)
中央高校基本科研业务费资助项目(300102288302,300102288710)
关键词
粘结
锈蚀
极限强度
压-剪-弯交互作用
钢筋混凝土柱
bond
corrosion
ultimate strength
axial-shear-flexure interaction
reinforced concrete columns
