新型内嵌耗能壳板箱形钢墩柱抗震性能研究

SEISMIC BEHAVIOR OF NEW-TYPE BOX STEEL PIER COLUMN WITH EMBEDDED ENERGY-DISSIPATION SHELL PLATES

为探讨新型内嵌耗能壳板箱形钢墩柱的抗震性能,建立新型钢墩柱的有限元模型,并与试验结果进行对比分析,验证了本文有限元模型的准确性。开展新型钢墩柱滞回性能的参数分析,得出试件的横向加劲肋间距或轴压比减小时,试件的承载能力、滞回曲线所包络的面积以及极限位移均随之增大;内嵌壳板厚度增大时,试件抗震性能明显改善,而改变内嵌壳板弧度对试件抗震性能的影响相对较小,试件的长细比越小,其初始刚度越大,骨架曲线下降段越陡,承载力退化越严重。

The finite element models of new-type steel columns were established in order to investi- gate seismic behavior of the new-type box steel pier column with embedded energy-dissipation shell plates. The numerical results were compared with the experimental data, and the accuracy of finite ele- ment models in the paper were verified. The parameter analysis on hysteretic behavior of the new-type steel columns was carried out. The study results show that the bearing capacity, the area of hysteresis curve and the ultimate displacement of specimens are increased with the decrease of the space between transverse stiffeners on shell plates or the axial compression ratio of specimens. The seismic behavior of specimens is obviously improved when the thickness of embedded shell plates is increased. While the ra- dian of embedded shell plates has negligible effects on seismic performance of the specimens. With smal- ler slenderness ratio, the initial stiffness of the specimens is enlarged, and the skeleton curve and the bearing capacity degenerate dramatically.