带肋薄壁方钢管混凝土柱的滞回性能

对9根带肋薄壁方钢管混凝土柱的滞回性能进行了试验研究,其主要参数为轴压比和加劲肋的布置.通过试验,研究了试件的破坏形态、滞回特性和耗能能力等重要抗震性能指标.结果表明:轴压比对试件的滞回性能影响很大,当轴压比小于0.5时,四边设肋试件的滞回曲线较饱满,具有较好的延性和耗能能力,而对边设肋试件的滞回曲线出现了轻微的捏缩现象;当轴压比大于0.5时,试件的延性较差.在相同轴压比下2种设肋形式试件的极限承载力较接近,但是四边设肋试件的延性好于对边设肋的试件,滞回曲线更丰满.采用大型有限元程序ABAQUS6.4对每个试件的试验全过程进行了模拟计算,计算结果与试验结果符合较好,为进一步开展带肋薄壁钢管混凝土柱的研究提供了基础.

Hysteretic behavior of square concrete-filled thin-walled steel tubular columns with ribs

The hysteretic behavior of nine square concrete-filled thin-walled steel tubular(CFTST) columns with ribs was investigated experimentally and the failure mode,hysteretic behavior and energy dissipation capacity were examined. The main parameters in the study are the axial load level and the arrangement of ribs.Experimental results indicate that the axial load level has a great influence on the hysteretic behavior of CFTST columns. Specimen with four ribs and axial load level below 0.5 has plump hysteretic loops,better ductility and energy dissipation capacity.Slight pinch phenomenon is observed for two kinds of rib specimens.The ductility of CFTST columns decreases significantly when the axial load level is greater than 0.5.Columns with two kinds of rib arrangement have almost the same load capacity,while the ductility and hysteretic behavior of columns with four ribs is better than that of columns with two opposite ribs under same axial load level.Finally,a non-linear finite element analyses is carried out by using the ABAQUS6.4.The analytical results are in good agreement with the test results and this provides a favorable foundation for further study.