Meso-Scale Modelling of Size Effect on Pure Torsional Failure of CFST Columns
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摘要: 在地震作用下,钢管混凝土柱常受到扭转作用或压-弯-剪-扭复合作用,扭矩的存在会加剧钢管混凝土柱的破坏.为探究钢管混凝土柱纯扭破坏及尺寸效应行为,采用三维细观数值模拟方法,考虑混凝土细观组分的非均质性及钢管与混凝土间的接触作用,建立了钢管混凝土柱的三维纯扭细观数值模型.分析了结构尺寸、套箍系数和截面形状对不同尺寸钢管混凝土柱纯扭破坏的影响.最后,对比并修正了Bažant尺寸效应律,提出了全尺寸范围内的名义抗扭强度公式.结果表明:(1)素混凝土柱纯扭破坏表现出显著的脆性破坏特征,而钢管混凝土柱纯扭破坏表现出一定的延性破坏特征;(2)钢管混凝土柱纯扭破坏具有尺寸效应,且方柱的尺寸效应强于圆柱;(3)在低约束作用(用套箍系数标征)下,钢管混凝土柱纯扭破坏尺寸效应较为明显,随着套箍系数的增加,名义抗扭强度的尺寸效应被削弱.Abstract: Under the action of earthquake,concrete-filled steel tubular(CFST) columns are often subjected to torsion action or combined action of compression-bending-shear-torsion.The existence of torque will aggravate the damage of CFST columns.In order to study the pure torsional failure and size effect behavior of CFST columns,a numerical model of CFST columns on pure torsional failure was established by using the three-dimensional meso-scale numerical simulation method,considering the meso-heterogeneity of concrete and the contact between steel tube and concrete.The influence of structural size,confinement coefficient and cross-sectional shape on torsional failure of CFST columns with different sizes were analyzed.Finally,the Bažant size effect law was compared and revised,and the formula for the nominal torsion strength in the full size range was proposed.The results show that:(1)Pure torsion failures of plain concrete columns show significant brittle failure characteristics,while pure torsion failures of CFST columns show certain ductile failure characteristics;(2)The pure torsion failure of the CFST column has the size effect,and the size effect of the square columns is stronger than that of the circular columns;(3)Under low constraints(use confinement coefficient to mark),the size effect of the pure torsion failure of the CFST column is more obvious,with the increase of the confinement coefficient,the size effect of the nominal torsion strength is weakened.
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