圆薄壁钢管混凝土弯曲性能试验研究

Experim entalstudy on flexural perform ance of circular thin walled concrete filled steeltube

为进一步研究和探讨长径比、套箍系数、偏心率等因素对圆形薄壁钢管混凝土弯曲性能的影响,选取一定规模和数量的构件,通过力学性能的试验,并采用有限元软件ABAQUS系统地分析了各个参数对构件破坏模式、刚度、极限承载力等静力性能的影响规律。试验结果表明:偏心率、长径比、套箍系数等参数对构件作用程度不同。偏心率大的构件极限荷载会急剧下降,偏心率小的构件极限荷载略微平缓,而到了后期两者趋向于接近;长径比大的钢管混凝土构件,刚度、屈服荷载和极限承载力都明显降低,而长径比较小的钢管混凝土构件,刚度、屈服荷载和极限承载力都明显增加;套箍系数大的构件极限承载能力强,而套箍系数小的构件极限承载能力弱。其中偏心率对构件的刚度和承载能力影响最显著,套箍系数的影响是最小的。

In order to further study and discuss the influence of the ratio of length to diameter,the coefficient of hoop and the eccentricity on the flexural performance of the circular thin-walled concrete filled steel tube,a certain scale and number of components are selected.Through the test of mechanical properties and the finite element software ABAQUS,the failure modes,stiffness and ultimate bearing of each component are analyzed systematically.The influence law of load and other static properties.The test results show that eccentricity,aspect ratio,hoop coefficient and other parameters have different effects on members.The ultimate load of the member with large eccentricity will drop sharply,and the limit load of the member with small eccentricity is slightly slow,but the latter two tends to be close.The stiffness,yield load and ultimate bearing capacity of the concrete filled steel tube with long diameter ratio are obviously reduced,and the stiffness and yield load of the steel tube with small length and diameter are smaller.The ultimate bearing capacity of the members with large hoop coefficient is strong,while the ultimate bearing capacity of the members with small hoop coefficient is weak.The eccentricity rate has the most significant influence on the stiffness and bearing capacity of the members,and the influence of hoop coefficient is the weakest.