摘要
为研究高强方钢管-混凝土-圆钢管(HSCS)组合短柱的轴压性能,以环混凝土轴心抗压强度(f ck)、外高强方钢管的抗拉强度、壁厚和宽度、内圆钢管的抗拉强度、壁厚和直径,以及试件的长细比和空心率等为控制参数,共设计27根试件。基于合理的材料本构模型、网格合理性分析和既有试验试件验证分析,确定该模型的预测精度,进而获得各个参数对足尺寸HSCS组合短柱轴压性能的影响规律。结果表明:随宽度、壁厚、内钢管抗拉强度、外钢管抗拉强度和混凝土抗压强度的增加,HSCS组合短柱的轴压承载力显著提高;随试件空心率增加,组合短柱的轴压承载力逐渐减小,建议空心率最佳取值为0.1~0.3。HSCS组合短柱轴压承载力计算表达式具有较高的预测精度,可满足工程实践需要。
In order to study the axial compression performance of the high-strength square-steel-tube-concrete-circular-steel-tube(HSCS)short column,27 HSCS specimens are designed by considering the main parameters of compressive strength(f ck)of the ring concrete,the tensile strength(f yo),thickness(t o)and width(B)of the outer steel tube,the tensile strength(f yi),thickness(t i)and diameter(D)of the inner steel tube,the slenderness ratio(λ)and section hollow rate(T).Based on a reasonable material constitutive model,mash rationality analysis and verification analysis of existing test specimens,the prediction accuracy of the model is determined.Furthermore,the influence of each parameter on the axial compression performance of the full-size HSCS short column is obtained.The results show that with the increasing of B,t o,f yi,f yo and f ck,the axial compression bearing capacity of this specimens is significantly improved,but with the increasing of T,it gradually decreases.The best value of T is recommended to be 0.1-0.3.Finally,the calculation expression of the axial compression bearing capacity of the HSCS short column is derived,which has high prediction accuracy and can meet the needs of engineering practice.
作者
李晓丽
陈莉
LI Xiaoli;CHEN Li(School of Geosciences,Northeast Petroleum University,Daqing,Heilongjiang 163318,China)
出处
《东北石油大学学报》
CAS
北大核心
2021年第1期112-122,I0008,共12页
Journal of Northeast Petroleum University
关键词
高强方钢管-混凝土-圆钢管
组合短柱
轴压性能
截面空心率
本构模型
high-strength square-steel-tube-concrete-circular-steel-tube
composite short column
axial compression performance
section hollow ratio
constitutive model
