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为了进一步研究内设加劲肋钢管柱填充混凝土后的力学性能,参照某桥上、下弦杆截面,进行了内设加劲肋钢管混凝土柱的轴压短柱试验,得到了试件的极限承载力和破坏模式,并与内设加劲肋空钢管柱进行了对比。试验研究结果表明:内设加劲肋钢管混凝土柱力学特征存在明显三阶段破坏,破坏模式与设直肋薄壁钢管混凝土柱有所同,发生“半波”、“双波”破坏不及薄壁钢管混凝土柱明显。同时,采用大型通用有限元程序ANSYS建立了三维有限元模型,对试件的承载力和荷载应变曲线进行了分析,分析结果与试验结果吻合良好,在此基础上进一步分析了宽厚比对设加劲肋钢管混凝土柱受力性能的影响。
In order to further study the mechanical properties of the stiffened steel columns filled with concrete, the axial compression short columns with stiffened CFST columns were tested with reference to the cross-section of the upper and lower chords. The ultimate bearing capacity and Failure mode, and compared with the internal stiffener empty steel column. Experimental results show that there are obvious three-stage failure of the mechanical characteristics of the CFST column with stiffened stiffeners. The failure modes are the same as those of the straight-walled CFST columns with “half wave” and “double wave” failure Not as obvious as thin-walled CFST columns. At the same time, a three-dimensional finite element model was established by the large-scale finite element program ANSYS. The bearing capacity and load-strain curve of the specimen were analyzed. The analysis results agree well with the experimental results. Based on the analysis, Influence of Concrete Filled Steel Tubular Columns on Mechanical Performance.