圆不锈钢管混凝土短柱轴压承载力性能研究  

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

作　　者：唐红元[1] 范璐瑶 赵鑫 杨虹[1] TANG Hongyuan;FAN Luyao;ZHAO Xin;YANG Hong(Institute of Structural Engineering,Xihua University,Chengdu 610039,China)

机构地区：[1]西华大学结构工程研究所,四川成都610039

出　　处：《地震工程与工程振动》2021年第1期63-69,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家留学基金项目(201708515135);教育部春晖计划项目(192647)。

摘　　要：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:30 MPa增加到40 MPa,50 MPa增加到60 MPa,40 MPa增加到50 MPa;混凝土强度相同时,壁厚越大,CFSST短柱极限承载力的增大幅度越小;与普通钢管混凝土不同的是,当ξss<1.2时,荷载-轴向位移曲线达到峰值点短暂下降后又继续趋于向上;不锈钢管和核心混凝土的轴力分配情况分为3类:当ξss<ξ1时,混凝土始终大于不锈钢管承担的轴向荷载;当ξss>ξ2时,与之相反;当ξ1<ξss<ξ2时,混凝土和不锈钢管先后大于对方所承担的轴力,且相差较小。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.

关 键 词：不锈钢管混凝土 轴压承载力 有限元 约束效应系数 轴力分配 

分 类 号：TU398.9[建筑科学—结构工程]