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为了给寒区钢管混凝土结构的设计与施工提供参考,针对拱桥拱肋或桥墩中普遍采用的钢管混凝土,考虑冻融循环次数、核心混凝土立方体抗压强度等因素的影响,进行了冻融循环作用后钢管混凝土轴压短柱的试验研究。基于试验结果分析,提出了冻融循环作用后核心混凝土的本构关系,同时利用该本构关系建立了冻融循环作用后钢管混凝土轴压短柱的有限元分析模型,并与试验结果进行对比。研究结果表明:冻融循环作用后钢管混凝土轴压短柱的破坏形态和荷载-应变曲线总体上与未遭受冻融循环作用试件类似,但试件的承载力和组合弹性模量随冻融循环次数的增加而减小;有限元理论模型的计算结果与试验结果总体吻合较好。
In order to provide references for the design and construction of concrete filled steel tubular structures in cold regions, the effects of freeze-thaw cycles, the number of freeze-thaw cycles, the compressive strength of core concrete cubes, and so on, Experimental study on post concrete filled steel tubular stub columns. Based on the analysis of test results, the constitutive relation of core concrete after freeze-thaw cycle was put forward. At the same time, the finite element analysis model of CFST short columns was set up by using this constitutive relation, and compared with the experimental results . The results show that the failure modes and load-strain curves of CFST short columns are similar to the ones without freeze-thaw cycles, but the bearing capacity and combined elastic modulus of the specimens vary with the freeze-thaw cycles The number of cycles decreases and the calculated results of finite element model are in good agreement with the experimental ones.