热带海洋环境下钢筋混凝土构件承载力退化研究  

Load-bearing capacity degradation of reinforced concrete membersin tropical marine environment

作　　者：朱海威 余红发[2] 麻海燕[2] 达波 范志宏[1] 杨海成[1] 杨礼明 ZHU Haiwei;YU Hongfa;MA Haiyan;DA Bo;FAN Zhihong;YANG Haicheng;YANG Liming(CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Guangzhou 510230,China;Department of Civil and Airport Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;Guangxi Communications Design Group Co.,Ltd.,Nanning 530029,China)

机构地区：[1]中交四航工程研究院有限公司,广东广州510230 [2]南京航空航天大学土木与机场工程系,江苏南京211106 [3]广西交通设计集团有限公司,广西南宁530029

出　　处：《西安建筑科技大学学报（自然科学版）》2024年第4期512-524,共13页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金(11832013,51878350);2021年交通运输行业重点科技项目(2021-MS1-002)。

摘　　要：为研究热带海洋严酷环境下钢筋混凝土结构的承载力退化规律,通过对南海现场暴露3.5a后的C50、C80钢筋混凝土梁柱构件进行混凝土回弹值与超声波、钢筋锈蚀率与拉伸、梁受弯与柱大偏心受压测试,系统分析混凝土抗压强度、钢筋失重率、梁受弯承载力与柱大偏心受压承载力等物理力学性能的变化特征,并与既有承载力退化模型进行验证.结果表明:经现场暴露试验后,C50、C80构件的混凝土抗压强度与相对动弹性模量下降,且C50构件中混凝土损伤较C80构件的严重;C50构件已发生钢筋锈蚀,而C80构件中钢筋仍处于钝化状态;C50、C80梁在受弯条件下的抗裂性能与极限受弯承载力下降,且C50梁较C80梁下降明显;C50、C80柱在大偏心受压条件下的抗裂性能与极限受压承载力小幅下降.In order to investigate the deterioration laws of load-bearing capacity of reinforced concrete structures in tropical marine environment,changes in the compressive strength of concrete,relative dynamic elastic modulus of concrete,reinforcement weight loss,bending capacity of beams and eccentric compression capacity of columns were analyzed by testing the rebound value,ultrasound wave velocity,beam bending resistance and column resistance of the reinforced concrete members exposed in the South China Sea for 3.5 years,and the data was verified with the theoretical formulas.The results show that after the field exposure,the concrete compressive strength and relative dynamic elastic modulus of C50 and C80 members decrease,and the concrete damage in C50 members was more serious than that in C80 members.The reinforcement in the C50 members has been corroded,while the reinforcement in the C80 members is still in the passivation state.The crack resistance and ultimate bending capacity of C50 and C80 beams under bending conditions decrease,and the decrease of C50 beams is more obvious than that of C80 beams.The crack resistance and ultimate bearing capacity of C50 and C80 columns under large eccentric compression decrease slightly.

关 键 词：热带海洋环境 现场暴露 钢筋混凝土构件 混凝土劣化 钢筋锈蚀 承载力退化 

分 类 号：TU654[建筑科学—建筑技术科学]