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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (6): 1083-1091    DOI: 10.3785/j.issn.1008-973X.2019.06.007
土木与建筑工程     
轴压圆钢管混凝土短柱非线性徐变效应分析方法
李世伟(),杨永清*(),蒲黔辉,孙博
西南交通大学 土木工程学院，四川 成都 610031
Nonlinear creep effect analysis for short concrete-filled circular steel tubular columns under axial compression
Shi-wei LI(),Yong-qing YANG*(),Qian-hui PU,Bo SUN
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
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摘要：

运用连续介质损伤力学的方法，分析轴压圆钢管混凝土（CFST）短柱在高应力水平下的非线性徐变效应. 提出一种新的均匀约束条件下的混凝土塑性损伤本构模型（DPM-UC），以便于模拟高应力下的塑性和损伤演化；以DPM-UC为基础，提出一种新的考虑混凝土徐变三维特性的非线性徐变效应分析理论框架，建立相应的数值分析方法，并嵌入到有限元分析软件ABAQUS中. 将不同应力水平下的徐变试验结果与分析结果进行对比，结果显示：当承受较大应力水平时，采用非线性与线性徐变理论的计算结果差异明显，采用非线性徐变理论的预测值与实测值更为接近，验证了所提方法的可靠性与合理性.
关键词： 结构工程;  圆钢管混凝土（CFST）短柱;  非线性徐变效应;  连续介质损伤力学;  ABAQUS二次开发    
Abstract:

The nonlinear creep effect of axial loaded short concrete-filled circular steel tubular columns under high stress levels was studied based on the continuum damage mechanics method. First, a new damaged plasticity model for uniform confined concrete (DPM-UC) was proposed, making it convenient to simulate the plasticity and damage evolution of concrete under high stress levels. Next, a new theoretical frame for nonlinear creep effect analysis considering 3D characteristic was presented based on DPM-UC; a corresponding numerical analysis method was established and subsequently implemented into the finite element software ABAQUS. Finally, the analytical results were compared with the experimental results under different stress levels. Results show that the calculated results of nonlinear and linear creep theory differ significantly under high stress levels. The predictive value presented by the nonlinear creep theory is closer to the test results, thus the reliability and validity of the proposed method are verified.
Key words: structural engineering    short circular concrete-filled steel tubular (CFST) columns    nonlinear creep effect    continuum damage mechanics    secondary development by ABAQUS
收稿日期: 2018-06-26 出版日期: 2019-05-22
CLC:  TU 392.3  
通讯作者: 杨永清     E-mail: lishiwei1987@my.swjtu.edu.cn;yangyongqingx@163.com
作者简介: 李世伟（1987—），男，博士生，从事钢混组合结构长期结构行为研究. orcid.org/0000-0002-1760-7410. E-mail: lishiwei1987@my.swjtu.edu.cn
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李世伟
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引用本文:

李世伟,杨永清,蒲黔辉,孙博. 轴压圆钢管混凝土短柱非线性徐变效应分析方法[J]. 浙江大学学报(工学版), 2019, 53(6): 1083-1091.

Shi-wei LI,Yong-qing YANG,Qian-hui PU,Bo SUN. Nonlinear creep effect analysis for short concrete-filled circular steel tubular columns under axial compression. Journal of ZheJiang University (Engineering Science), 2019, 53(6): 1083-1091.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.06.007    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I6/1083

图 1  均匀约束条件下应力状态在偏平面上的投影
图 2  均匀约束条件下Haigh-Westergaard坐标系中的拉、压子午线
试件编号 D/mm T/mm h/mm F/kN nc
试验I 0.46-a 138 2.57 380 420 0.46
试验I 0.46-b 138 2.49 380 420 0.46
试验I 0.72-a 138 2.57 380 679 0.72
试验I 0.72-b 138 2.53 380 679 0.72
试验II 0.38-a 108 4.00 330 377 0.38
试验II 0.80-a 108 4.00 330 793 0.80
表 1  CFST徐变试验试件参数
构件名称 fck/MPa fy/MPa Ec/GPa Es/GPa μ
试验I 核心
混凝土 		33 ? 33.4 ? 0.17
试验II 60 ? 37.7 ? 0.17
试验I 圆钢管 ? 299 ? 189 0.28
试验II ? 345 ? 206 0.28
表 2  CFST徐变试验试件材料参数
图 3  CFST徐变试验加载装置
MPa?1
试验 q2 q3 q4
试验I 110.88×10?6 6.91×10?6 2.47×10?6
试验II 35.11×10?6 2.00×10?6 0.84×10?6
表 3  B4徐变模型计算参数
图 4  轴压CFST短柱徐变试验试件有限元模型
图 5  混凝土徐变应变计算曲线
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