钢筋锈蚀对全珊瑚海水钢筋/混凝土柱大偏心受压性能的影响

达波; 余红发; 麻海燕; 朱海威; 巩位; 吴彰钰

doi:10.13801/j.cnki.fhclxb.20181228.001

钢筋锈蚀对全珊瑚海水钢筋/混凝土柱大偏心受压性能的影响

南京航空航天大学土木工程系, 南京 20016

基金项目: 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）

详细信息

通讯作者:
余红发,博士,教授,博士生导师,研究方向为海洋混凝土耐久性,E-mail:yuhongfa@nuaa.edu.cn

中图分类号: TU528
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出版历程
- 收稿日期: 2018-10-21
- 刊出日期: 2019-10-14

Influence of steel corrosion to the large eccentric compression behavior of coral aggregate reinforced concrete column

Department of Civil Engineering, Nanjing University of Aeronautic and Astronautic, Nanjing 210016, China

摘要

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（N_u）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N_u比有机新涂层钢筋CA/CC的N_u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N_u计算模型。
- 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
Abstract: 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 (N_u) 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, a greater slip was produced in the layer between the organic new coated steel and coral aggregate concrete(CA/C). N_u of 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 N_u of CA/CC under large eccentric compression is proposed.
- coral aggregate reinforced concrete column /
- large eccentric compression /
- concrete strength grade /
- reinforcement type /
- steel corrosion /
- ultimate bearing capacity

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