摘要
为研究冻融循环作用对方钢管混凝土短柱的影响,本试验以冻融循环次数为参数对冻融循环作用后方钢管混凝土短柱的力学性能进行了研究。试验得到了冻融循环作用下方钢管混凝土短柱的受压破坏模式,荷载—位移曲线以及荷载—应变曲线,并分析了冻融循环次数对方钢管混凝土短柱极限承载力,位移延性以及初始刚度的影响。根据试验现象,将破坏模式分为2种。研究表明:方钢管混凝土短柱的力学性能如极限承载力,位移延性以及初始刚度受冻融循环作用影响重大。具体表现为试件的极限承载力随冻融次数增加而逐渐下降,且冻融循环次数越大,极限承载力下降幅度愈明显;对于试件的初始刚度,其随着冻融循环次数的增加而减小;另外,冻融循环作用对方钢管混凝土短柱的延性系数影响较大,表现为随冻融循环次数的增加,延性系数随之增加。
Inorder to analyze the effect of the number of freeze-thaw cycles on the mechanical behaviors of square concrete filled steel tube（ CFST） stub columns,an experimental study on several specimens was conducted. The failure modes,load-deformation curves and load-strain curves of the specimens were presented. According to the test phenomenon,all specimens could be divided into two categories according to their failure modes. The effect of the number of freeze-thaw cycles on the ultimate load bearing capacity, ductility and initial stiffness of the specimens was investigated. The results show that the freeze-thaw cycles has a great impact on the mechanical behaviors of square CFST stub columns,especially for the ultimate load bearing capacity,ductility coefficient and the initial stiffness. The ultimate load bearing capacity of the specimens decreases with the increase of the number of freeze-thaw cycles,and the larger the number of freeze-thaw cycles,the more obvious decline of the ultimate load bearing capacity. The initial stiffness of thespecimens decreases with the increase of the number of freeze-thaw cycles. In addition,it can be found that the ductility of the specimens increases with the increase of the number of freeze-thaw cycles.
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2017年第4期1250-1255,共6页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(51478047
51278209)
大学生创新创业计划训练项目(5011700834)
关键词
方钢管混凝土短柱
冻融循环
极限承载力
延性系数
初始刚度
square concrete filled steel tube stub columns
freezing and thawing cycles
ultimate load bearing capacity
ductility coefficient
initial stiffness
