混凝土结构三维非线性徐变效应分析方法  

3D nonlinear creep analysis method for concrete structures

作　　者：李世伟[1] 杨永清[1] 陈远久[1] LI Shiwei;YANG Yongqing;CHEN Yuanjiu(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《中南大学学报（自然科学版）》2019年第3期704-711,共8页Journal of Central South University:Science and Technology

基　　金：铁道部科技研究开发计划重大课题资助项目(2008G031-K)~~

摘　　要：为准确分析混凝土结构在不同应力水平和多向受力状态下的徐变效应,首先,通过徐变泊松比提出复杂应力状态下的徐变预测模型;然后,以混凝土塑性损伤本构模型为基础,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模型,建立相应的数值分析方法,并结合有限元分析软件ABAQUS二次开发计算程序;最后,通过徐变试验验证方法的可靠性。研究结果表明:提出的分析模型计算方便,所得结果合理,能够适用于复杂应力状态下的线性及非线性徐变效应分析。In order to exactly analyze creep effects of concrete structures at different stress levels and under multiaxial loadings,firstly,a prediction model of creep in complex stress states was proposed through creep Poisson's ratio.Secondly,based on the concrete damage plasticity(CDP)model,a new nonlinear creep effect analysis model considering 3D characteristic was presented,and a corresponding numerical method was established and implemented into the ABAQUS secondary platform.Finally,the reliability of the method was shown by comparing the analytical results to the classical experimental results.The results show that the proposed analytical model is convenient to calculate and the obtained results are rational,and can be widely used in the analysis of linear or nonlinear creep effect in complex stress states.

关 键 词：混凝土结构 三维徐变特性 非线性徐变 ABAQUS二次开发 

分 类 号：U448.21[建筑科学—桥梁与隧道工程] TU311.41[交通运输工程—道路与铁道工程]