圆不锈钢管混凝土短柱轴压承载力性能研究

为了研究圆不锈钢管混凝土柱轴压承载力性能,在试验的基础上,利用有限元软件ABAQUS建立合理的有限元模型,并进行不同混凝土强度和约束效应系数参数化分析及不锈钢管和核心混凝土的轴力分配研究.结果表明:壁厚相同时,CFSST短柱的极限荷载增大幅度由大到小为:30MPa增加到40 MPa,50 MPa增加到60 MPa,40...

Study on bearing capacity of concrete-filled circular stainless steel tubular stub columns under axial compression

In order to study the bearing capacity of concrete-filled stainless steel tube(CFSST)stub column under axial compression,a finite element model is established by using the finite element software ABAQUS on the basis of the test.The parametric analysis of different concrete strength and restraint effect coefficient was conducted.And the axial force distribution of stainless steel tubes and core concrete were carried out.The results show that,under the same wall thickness,the enhancement in the ultimate bearing capacity of CFSST short columns from the largest to the smallest is that,with the core concrete increasing from 30 MPa to 40 MPa,from 50 MPa to 60 MPa,and from 40 MPa to 50 MPa.With the same concrete strength,the increase of ultimate bearing capacity of CFSST short columns decreases with the increase of wall thickness.When the restraint coefficient of the stainless steel tube(ξss)<1.2,the load axial displacement curve reaches the peak point and then it continues to decline.And the distribution of stainless steel tube and core concrete is mainly divided into three categories,that is,whenξss<ξ1,the axial load undertook by concrete is always greater than that of the stainless steel tube.Whenξss>ξ2,it is just the opposite.Whenξ1<ξss<ξ2,the concrete and stainless steel tubes are successively larger than the axial force undertook by the other side,and the difference can be ignored.