论文部分内容阅读
基于已有的试验研究与理论分析,给出了矩形钢管混凝土中钢管不出现局部屈曲时的最大宽厚比限值,同时提出大宽厚比下矩形钢管混凝土中考虑钢管屈曲的承载力计算方法。通过回归分析给出了矩形钢管混凝土轴压短柱、轴压中长柱的承载力简化计算公式,简化计算结果和大量试验结果进行对比,用试验结果验证了简化计算结果的正确性。同时,采用CECS、DBJ、EC4、LFRD及AIJ规程计算了矩形钢管混凝土承载力并和试验结果进行对比,对比结果表明:欧洲EC4规程、DBJ规程及简化计算结果与试验结果较为接近,所提出的简化计算公式不仅适用于普通宽厚比下矩形钢管混凝土承载力计算,且适用于大宽厚比下考虑局部屈曲时承载力计算,实现了普通壁厚和薄壁矩形钢管混凝土承载力计算公式的统一。
Based on the existing experimental research and theoretical analysis, the maximum thickness to thickness ratio limit of steel tube in rectangular CFST without buckling is given, and the calculation method of bearing capacity of steel tube in rectangular CFST with large aspect ratio is proposed. Through the regression analysis, a simplified calculation formula of the bearing capacity of rectangular CFST columns under axial compression and long columns under axial compression is given. The calculation results are compared with a large number of test results. The correctness of the simplified calculation results is verified by the test results. Meanwhile, the CECS, DBJ, EC4, LFRD and AIJ procedures were used to calculate the bearing capacity of the concrete filled rectangular steel tube and compared with the test results. The comparison results show that the European EC4 code, DBJ code and simplified calculation result are close to the experimental ones. The simplified calculation formula is not only applicable to the calculation of bearing capacity of concrete filled rectangular steel tube under general aspect ratio, but also applicable to the bearing capacity calculation considering local buckling under large aspect ratio, which realizes the unification of common wall thickness and formula of bearing capacity of thin-walled rectangular CFST.