混凝土结构非线性徐变计算方法研究  

NONLINEAR CREEP ANALYSIS METHOD FOR CONCRETE STRUCTURES

作　　者：黄海东[1] 向中富[1] 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074

出　　处：《工程力学》2014年第2期96-102,共7页Engineering Mechanics

基　　金：863计划现代交通技术专项课题项目(2008AA11Z102)

摘　　要：为准确分析既有病害条件下的混凝土结构长期变形及受力行为,该文进行了混凝土材料非线性徐变计算方法研究。以非线性弹性徐变本构理论为基础,利用Hongnestad模型推导出材料软化系数,提出一种新的非线性徐变本构模型,采用初应变法进行显式迭代,实现混凝土材料非线性徐变分析。以混凝土徐变及开裂的线性耦合假定为基础,模拟长期持载过程中裂缝的扩展。采用ADINA用户子程序二次开发实现了相关算法,并通过混凝土非线性徐变经典试验的对比分析,验证了计算方法的可靠性。The concrete nonlinear creep constitutive rule and the analysis method have studied for the accurate calculation of a long-term deflection and for the stressed condition of the concrete structures with defects. Based on the nonlinear elastic creep law, the stress softened coefficient is induced according to a Hongnestad model, and a new nonlinear creep constitutive model is presented. By the initial strain method, the creep incremental strain iteration is accomplished, considering the concrete material nonlinear effects. The linear coupling between creep and cracking is assumed for taking into account the development of cracking with time. The new material-model is implemented into the Adina user-supplied subroutine. Through comparing the analytical results to the classical experimental results, it is verified that the calculation method is reliable.

关 键 词：混凝土结构 非线性徐变 弥散型裂缝 初应变法 ADINA二次开发 

分 类 号：U445.7[建筑科学—桥梁与隧道工程]