开孔钢管混凝土柱抗震性能分析

RESEARCH ON SEISMIC BEHAVIOR OF CONCRETE-FILLED STEEL TUBE COLUMN WITH OPENINGS BASED ON FINITE ELEMENT METHOD

针对钢管混凝土结构中的穿筋单梁式节点,研究节点位置钢管壁开孔和加固对钢管混凝土柱抗震性能的影响。利用ABAQUS有限元软件对5个钢管混凝土柱进行低周反复荷载作用下的抗震性能分析,包括2个开孔构件、2个开孔加固构件和1个作为对比的未开孔钢管混凝土柱。基于模拟结果,对比了构件的破坏形态、滞回曲线、骨架曲线、延性系数和刚度退化等。结果表明:体积开孔率(开孔面积与钢管柱侧表面面积之比)为0.544%时,开孔构件的抗震性能与未开孔构件比较差别较小,但前者会造成开孔处钢管和混凝土应变发展加快;焊接加固管段可以改变开孔钢管混凝土柱的屈曲破坏位置、缓解开孔处应力集中和提高构件承载力。

In view of the reinforced beam type joint in concrete filled steel tubular structure,the research on the influence of openings and reinforcement on the seismic behavior of concrete-filled steel tube column was conducted. Using the finite element software ABAQUS to analyze five concrete filled steel tubular column specimens,including two opening components,two reinforced components and one as contrast components. Based on the simulation results,the paper compared the component failure modes, hysteresis curves, skeleton curves, ductility coefficient and the stiffness degradation,etc. The results showed that when the volume opening rate（opening area divided by the steel tube column side surface area） was 0. 544%,the difference of the seismic behavior between the perforated members and no-opening component was small. Weld reinforcement section could change the buckling location of the concrete-filled steel tube column with openings,so as to ease the stress concentration on openings and increase the bearing capacity of members.