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以长细比和偏心率为变化参数,对4个八边形中空夹层钢管混凝土偏心受压构件进行试验研究。通过对试验现象和试验结果的详细分析,总结出此类构件的一些力学特点,并与相同条件下的圆中空夹层钢管混凝土、方中空夹层钢管混凝土进行比较,发现其承载能力比方形截面柱高,比圆形截面柱稍低。其承载力影响因素主要有构件的轴压性能、抗弯性以及偏心率。在分析试验结果和利用数值分析的基础上,提出压弯构件承载力验算公式,与试验结果吻合良好。
Taking the slenderness ratio and the eccentricity as the parameters, four octagonal hollow steel tubular eccentric compression members were tested. Based on the detailed analysis of test phenomena and test results, some mechanical characteristics of such members are summarized and compared with those of circular-hollow CFST and CFD-CFST under the same conditions, and its bearing capacity is found to be higher than that of square section , Slightly lower than the circular cross-section column. The bearing capacity of the main components of the axial compression properties, bending resistance and eccentricity. Based on the analysis of the test results and the numerical analysis, the calculation formula of the bearing capacity of the compression-bending members is proposed, which is in good agreement with the test results.