摘要
以大连国贸中心大厦五边形多腔体钢管混凝土巨型柱为原型,为研究截面构造对其偏压性能的影响,进行了2个不同截面构造的巨型柱模型偏心受压性能试验。试件编号分别为CF-Ⅰ和CF-Ⅱ。CF-Ⅰ为五边形四腔体无钢筋笼截面试件,CF-Ⅱ为五边形四腔体带钢筋笼截面试件。试验得到了2个试件的承载力、荷载-变形曲线及损伤破坏特征等。利用ABAQUS有限元软件对各试件进行了数值模拟,计算结果与试验符合较好;在此基础上,分析了外钢管钢板厚度、对称轴分腔隔板厚度、周边竖向肋板厚度对柱偏压性能的影响。研究表明:加设钢筋笼可提高试件的承载力和延性;增加外钢管钢板厚度提高试件承载力和延性的比例,明显大于增加腔体对称轴分腔隔板厚度提高的比例;提高腔内周边竖向肋板的厚度,可明显减轻试件损伤。
Taking the pentagonal multi-cavity concrete filled steel tubular( CFST) mega-columns of Dalian International Trade Center building as the prototype,eccentric compression performance tests of two mega-column models with different cross-section constructions were carried out in order to investigate the influence of cross-section construction on eccentric compression behavior. Specimen CF-I was a CFST mega-column model with pentagonal quadruple-caved section without reinforcement cage inside and Specimen CF-Ⅱ was that with reinforcement cages inside. The load-bearing capacity,load-deformation curves and failure characteristics of two models were obtained and the finite element simulation was carried out based on ABAQUS as well. The results of simulations accord well with the test. In view of this,simulations are carried out for analyzing the effects of the thickness of the external steel tubular plates,the separator located in the axis of asymmetry and peripheral vertical ribs on eccentric behaviors of columns. The conclusions are drawn that the additional reinforcement cages can improve load-bearing capacity and ductility,the increased proportion of bearing capacity and ductility due to the increase of thickness of external plates is greater than that due to the increase of thickness of separator located in the axis of asymmetry,and that the damage of specimens are reduced by increasing the thickness of surrounding vertical ribs.
出处
《自然灾害学报》
CSCD
北大核心
2015年第1期114-122,共9页
Journal of Natural Disasters
基金
国家自然科学基金资助项目(51178010)
关键词
多腔钢管混凝土
五边形截面
巨型柱
偏心受压性能
数值模拟
multi-cavity CFST
pentagonal cross-sections
mega-columns
eccentric compressive behavior
numerical simulation
