【摘要】 为了更好的在实际工程中使用方钢管超高强混凝土偏心受压柱,同时了解该类构件的偏心受压工作机理,采用有限元软件ABAQUS,对方钢管超高强混凝土中长柱偏心受压全过程进行研究,同时分析长宽比、钢管壁厚、偏心率和混凝土强度等主要因素对其受力性能的影响。研究结果表明:其偏心受压全过程大致分成弹性、弹塑性和塑性三个阶段;构件的延性随长细比或偏心率的增大而提高;混凝土强度的提高对构件后期承载力影响不大;随着钢管壁厚的增加,不仅能显著提高其极限承载力,对后期承载力也有明显的提高。更多还原

【Abstract】 In order to better apply the eccentric load-bearing column of UHSC filled square steel tube in practical engineering,and understand the working mechanism of eccentric compression of this kind of structures at the same time,the finite element software ABAQUS is adopted to develop the finite element model of eccentrically loaded medium-and-long columns of ultra-high strength concrete filled square steel tube,and the whole process of eccentric compression is analyzed.Meanwhile,the influence of main factors such as slenderness ratio,steel tube wall thickness,eccentricity and strength of the concrete on its mechanical properties is analyzed.The results show that the whole process of eccentrically loaded mediumand-long columns of ultra-high strength concrete filled square steel tubes is divided into three stages which are elastic stage,elastic-plastic stage and plastic stage.The ductility of the component increases with the increase of slenderness ratio or eccentricity.With the improvement of the strength of concrete,it has little effect on the later bearing capacity of the component.Increase the wall thickness of the steel tube,the ultimate bearing capacity and the lateral bearing capacity are increased.The conclusion can provide reference for practical application of UHSC filled concrete.更多还原