摘要
为研究冻融循环作用对钢管混凝土结构力学性能的影响,对冻融作用下圆钢管混凝土短柱的力学性能进行了研究。通过对圆钢管混凝土短柱进行冻融试验及压力测试,得到了不同冻融循环次数下圆钢管混凝土短柱的极限承载力、荷载-位移曲线以及荷载-应变曲线。试验结果表明:冻融循环作用对圆钢管混凝土短柱力学性能如极限承载力、延性系数以及约束系数有较大的影响,具体表现为冻融循环作用降低了圆钢管混凝土短柱的极限承载力、延性系数以及约束系数,且随着冻融循环次数的增加,圆钢管混凝土短柱的极限承载力、延性系数以及约束系数均先降低后增加,因此,在实际工程中,应尽量减少冻融循环对钢管混凝土结构所带来的影响。
To investigate the effect of freezing and thawing on the mechanical propertiesof the concrete-filled steel tube structure,the paper studied the mechanical properties of the circular concrete-filled steel tube stub columns subjected to freeze-thaw cycles.The ultimate load bearing capacity,the load-displacement curves and the load-strain curves of the circular concrete-filled steel tube stub columns subjected to different number of freezing and thawing cycles were obtained by the freeze-thaw test and the compression test conducted on the circular concrete-filled steel tube stub columns.The results showed that freezing and thawing had an important impact on the mechanical properties of the circular concrete-filled steel tube stub columns,which was concretely shown as that the ultimate load bearing capacity,the ductility coefficient and the restraint coefficient of the circular concrete-filled steel tube stub columns decreased when the specimens were subjected to freezing and thawing,and with the increase of the number of freeze-thaw cycles,the mechanical properties of the specimens,including the ultimate load bearing capacity,the ductility coefficient and the restrain coefficient,were found to firstly decreased and then increased.Therefore,it is important to try the best to reduce the impact of the freezing and thawing on the concrete filled steel tube structure in the practical engineering.
出处
《钢结构》
北大核心
2017年第10期34-37,共4页
Steel Construction
基金
国家自然科学基金项目(51478047
51778066)
湖北省杰出青年基金项目(2017)
大学生创新创业训练计划项目(5011700834)
关键词
圆钢管混凝土
冻融循环
极限承载力
约束系数
延性系数
concrete-filled steel tube
freeze-thaw cycles
ultimate load bearing capacity
restraint coefficient
ductility coefficient
