【摘要】 提出了一种底部加强型矩形钢管混凝土柱,采取在柱底部区域钢板外侧贴焊钢板的构造措施,以提高其抗震耗能能力。进行了3个不同构造的矩形钢管混凝土柱模型的低周反复加载试验,模型1为普通矩形钢管混凝土柱,模型2为矩形截面底部垂直加载方向钢板外侧贴焊钢板的钢管混凝土柱,模型3为矩形截面底部双向外侧钢板均贴焊钢板的钢管混凝土柱。模型按1/5缩尺。分析了各模型的承载力、刚度及退化过程、延性、滞回耗能特性和破坏特征。给出了底部加强型矩形钢管混凝土柱正截面及斜截面承载力的计算公式,计算与实测结果符合较好。研究表明:所提出的底部加强型矩形钢管混凝土柱与普通矩形钢管混凝土柱相比,其承载力明显提高,延性和抗震耗能能力显著提高。更多还原

【Abstract】 The bottom strengthened rectangular concrete filled steel tube(CFST) column was put forward.The bottom area of the rectangular column was welded with steel plates to improve its seismic energy dissipation capacity.Three 1/5 scaled column models with different construction measures were tested under horizontal low cyclic loading.Model 1 is a conventional rectangular CFST column;Model 2 is a rectangular CFST column welded with steel plates at the outer bottom part vertical to the direction of loading;Model 3 is a rectangular CFST column welded with steel plates around lateral side of the bottom of the column.The load-bearing capacity,stiffness and degradation process,ductility,hysteretic energy dissipation capacity and failure characteristics of the models were analyzed.The calculation formula of load-bearing capacity of bottom strengthened rectangular CFST column for normal section and oblique section was given,and the results agree well with those from the experiments.The study shows that the load-bearing capacity,ductility and seismic energy dissipation capacity of the bottom strengthened rectangular CFST column are improved obviously compared with the conventional rectangular CFST column.更多还原