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为研究低周反复荷载下平缀管式等截面钢管混凝土格构柱的抗震性能,进行共计7根试件的拟静力试验,重点考察不同柱肢混凝土强度、柱肢纵向间距、缀管竖向间距对此类构件刚度、强度和延性的影响。同时,基于Open Sees平台建立了采用纤维单元的有限元计算模型,对此类钢管混凝土格构柱试件的滞回性能进行数值模拟,模拟结果与试验数据吻合良好。通过对试件破坏过程、荷载位移滞回曲线和骨架曲线等结果的分析表明:钢管混凝土格构柱试件具有良好的抗震性能,破坏形态均以整体压弯破坏为主,得到的水平荷载-位移滞回曲线饱满无捏缩;柱肢混凝土强度主要影响格构柱的承载力,随着混凝土强度等级从C40增加到C60,试件的承载力提高了5.7%;柱肢纵向间距由250 mm加大到650 mm,试件的承载力和位移延性系数分别提高了14.5%和6.8%;缀管竖向间距由200 mm增加到313 mm,试件的承载力和位移延性系数分别降低了12.9%和12.0%。
In order to study the anti-seismic performance of CFST column with flat-tube CFST under cyclic low cyclic loading, a total of seven specimens were subjected to quasi-static tests, focusing on the concrete strength of different columns, the longitudinal spacing of column and column, Effect of Pitch on Stiffness, Strength and Ductility of Such Members. At the same time, based on the Open Sees platform, a finite element model using fiber elements was established to simulate the hysteretic behavior of CFST specimens. The simulation results are in good agreement with the experimental data. Through the analysis of the failure process, load-displacement hysteresis curve and the skeleton curve, the results show that the specimens of the concrete-filled steel tubular columns have good anti-seismic performance, and the failure modes are mainly the whole bending failure. The horizontal load- And the displacement hysteresis curve is full without pinch. The strength of columnar concrete mainly affects the bearing capacity of the lattice columns. As the concrete strength increases from C40 to C60, the bearing capacity of the specimens increases by 5.7% The test results show that the bearing capacity and displacement ductility coefficient of the specimens increase by 14.5% and 6.8%, respectively. The vertical spacing of the pipes increases from 200 mm to 313 mm, and the bearing capacity and displacement ductility coefficient of the specimens decrease by 12.9 % And 12.0%.