局部承压圆钢管混凝土柱力学性能研究  

The Behavior of Circular CFST Columns Subjected to Concentric Local Compression

作　　者：杨有福[1] 何彦君[1] YANG Youfu HE Yanjun(School of Civil Engineering, Dalian University of Technology, Dalian 116024, China)

机构地区：[1]大连理工大学土木工程学院,辽宁大连116024

出　　处：《建筑钢结构进展》2016年第6期12-18,共7页Progress in Steel Building Structures

基　　金：国家自然科学基金(51421064)

摘　　要：为了研究不同截面形状垫块作用下圆钢管混凝土柱的局部承压性能,进行了14个试件的试验研究,考察了垫块截面形状、局部承压面积比和端板厚度对局部承压圆钢管混凝土柱破坏形态、荷载-变形曲线及承载力的影响。结果表明,垫块截面形状对局部承压圆钢管混凝土柱破坏形态的影响较小,但方形垫块作用试件的承载力和荷载-变形曲线的初始斜率略高于圆形垫块作用试件。在确定钢材和核心混凝土本构模型的基础上,建立有限元模型对局部承压圆钢管混凝土柱的力学性能进行了模拟,总体上模拟结果与试验结果符合较好。最后,根据研究结果修正了以往圆钢管混凝土柱局部承压承载力的计算方法。To study the local compressive behavior of circular concrete filled steel tube（CFST）columns under different crosssectional bearing plates（BP）,14 specimens were tested to investigate the influence of cross-section of BPs,local compression area ratio,and thickness of endplate on the failure pattern,load-deformation curves and bearing capacity.The experimental results show that the cross-section of BPs has little effect on the failure pattern of circular CFST columns under concentric local compression.However,the specimens with square BPs have slightly higher bearing capacity and initial slope of load-deformation curves than those with circular BPs.Finite element analysis models of circular CFST columns are also developed based on the constitutive model of steel and core concrete.Overall the predicted results are in a good agreement with the experimental results.At last,current formula for calculating the bearing capacity of CFST columns under local compression is revised based on the experimental and numerical results in this paper.

关 键 词：圆钢管混凝土柱 局部承压 力学性能 有限元 承载力 

分 类 号：TU398[建筑科学—结构工程]