海水干湿交替作用下持载钢筋引气混凝土柱滞回性能  

HYSTERETIC BEHAVIOR OF REINFORCED AIR-ENTRAINED CONCRETE COLUMNS WITH PERSISTENT LOADS UNDER SEAWATER WET-DRY ALTERNATION

作　　者：张健[1] 刁波[1,2] 周煜[1] 郑晓宁[1,2] 

机构地区：[1]北京航空航天大学土木工程系,北京100191 [2]华南理工大学亚热带建筑科学国家重点实验室,广州510641

出　　处：《工业建筑》2015年第3期83-88,99,共7页Industrial Construction

基　　金：国家自然科学基金资助项目(51178020);北京市自然科学基金资助项目(8092020);华南理工大学重点开放基金(2013KA03)

摘　　要：沿海地区的钢筋混凝土结构会同时受到使用荷载和氯离子侵蚀作用。通过实验室模拟沿海地区混凝土结构的工作状态,试验研究在海水干湿交替作用下承受不同比例持续偏心荷载钢筋引气混凝土柱的表面剥蚀、裂缝发展以及滞回性能,使用显微镜观测裂缝处混凝土并测定氯离子含量;分析海水干湿交替作用与持续荷载比例对柱承载力、刚度、延性的影响。结果表明,经过100次海水干湿交替作用后,钢筋混凝土柱的滞回曲线随着持续荷载比例的增加变得不对称;持载比例越大,正向加载时,柱子的屈服荷载、极限荷载、刚度和延性越小,反向加载时屈服荷载与极限荷载变化不大,刚度与延性均呈现先增大后降低的趋势。Reinforced concrete structures in coastal areas are always subjected to chloride wet-dry alternation and persistent loading.The working status of reinforced concrete structures in coastal areas were simulated in laboratory, the surface scaling, cracks development and hysteretic behavior of reinforced air-entrained concrete columns with different persistent eccentric load ratios under seawater wet-dry alternation were experimentally investigated.The impact of seawater wet-dry alternation and persistent eccentric load ratio on the bearing capacity, stiffness and ductility were analyzed.Results showed that after 100 cycles of seawater wet-dry alternation, the hysteresis curve was asymmetrically changed with the increase of persistent load ratio.As the persistent loads increased, the stiffness, ductility, yield load and ultimate load of columns gradually decreased in forward loading direction ( same stress distribution as that produced by persistent eccentric load ) , and in reverse loading direction, the yield load and ultimate load changed little, the stiffness and ductility both have tendency to increase first and then decrease.

关 键 词：钢筋引气混凝土柱 持续偏心荷载 海水干湿交替 裂缝发展 滞回性能 延性 

分 类 号：TV431[水利工程—水工结构工程]