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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。
In order to study the effect of freeze-thaw cycles on the mechanical properties of CFST structure, the mechanical properties of CFST stub columns under freeze-thaw cycles were studied. The ultimate bearing capacity, load - displacement curve and load - strain curve of CFST stub columns under different freeze - thaw cycles were obtained by freezing and thawing tests and pressure tests on the CFST stub columns. The experimental results show that the effect of freeze-thaw cycles on the mechanical properties such as ultimate bearing capacity, ductility coefficient and restraint coefficient of short CFST columns have a great influence on the ultimate bearing capacity of concrete filled CFST columns , Ductility coefficient and restraint coefficient. With the increase of the number of freeze-thaw cycles, the ultimate bearing capacity, ductility coefficient and restraint coefficient of CFST stubs first decrease and then increase. Therefore, in practical engineering, the freezing and thawing should be minimized Effect of circulation on concrete-filled steel tube structure.