摘要
通过对不同混凝土强度等级、不同种类钢筋的全珊瑚海水钢筋/混凝土柱(CA/CC)进行大偏心受压性能试验,研究了CA/CC的破坏形态、变形和承载力,建立了荷载-位移、荷载-应变等关系,探讨了CA/CC大偏心受压极限承载力(Nu)的计算模型。结果表明:CA/CC的受力破坏机制和形态与普通骨料钢筋/混凝土柱(OA/CC)基本相似。随着混凝土强度等级的提高,CA/CC纵向受拉钢筋应变开始突变所对应的荷载逐渐增大。在加载过程中,有机新涂层钢筋与珊瑚/混凝土(CA/C)之间产生较大的滑移,使在相同混凝土强度下,普钢钢筋CA/CC的Nu比有机新涂层钢筋CA/CC的Nu大约高7.1%~20.8%。建议在CA/C结构中采用有机新涂层钢筋,能有效的抑制钢筋发生锈蚀,从而延长CA/C结构的有效服役寿命。综合考虑钢筋锈蚀和涂层钢筋滑移的影响,提出了适用于满足高强、高耐久性要求的CA/CC大偏心受压Nu计算模型。
The large eccentric compression behavior of coral aggregate reinforced concrete column(CA/CC)with different types of reinforcement and concrete strength grade was tested.The failure mode,deformation and bearing capacity were investigated.The relationships of load-displacement and load-strain were established.The applicable calculation model for ultimate bearing capacity(Nu)of CA/CC under large eccentric compression was suggested.The results show that the compression behavior of CA/CC is similar to the ordinary aggregate reinforced concrete column(OA/CC).With the increase of concrete strength grade,the load corresponding to the sudden change of the strain of CA/CC longitudinal tensile steel gradually increases.In the loading process,agreater slip was produced in the layer between the organic new coated steel and coral aggregate concrete(CA/C).Nuof common steel is approximately 7.1%~20.8%higher than that of organic new coated steel.The application of organic new coated steel in the CA/C structure is suggested to effectively inhibit steel corrosion and extends the effective service life of the CA/C structure.Based on the comprehensive consideration on the effects of steel corrosion and slip of the coated steel,a calculation model for Nuof CA/CC under large eccentric compression is proposed.
作者
达波
余红发
麻海燕
朱海威
巩位
吴彰钰
DA Bo;YU Hongfa;MA Haiyan;ZHU Haiwei;GONG Wei;WU Zhangyu(Department of Civil Engineering,Nanjing University of Aeronautic and Astronautic,Nanjing 210016,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2019年第10期2426-2438,共13页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51678304
51508272
51878350
11832013)
江苏省自然科学基金(BK20180433)
中国博士后科学基金(2018M630558)
关键词
全珊瑚海水钢筋/混凝土柱
大偏心受压
混凝土强度等级
钢筋种类
钢筋锈蚀
极限承载力
coral aggregate reinforced concrete column
large eccentric compression
concrete strength grade
reinforcement type
steel corrosion
ultimate bearing capacity
