摘要
本文讨论了混凝土非线性分析中的单元尺寸效应,并基于断裂能和钝裂缝带模型提出把开裂应变作为开裂位移与积分点单元特征长度的函数,应用于塑性损伤模型中,保证了断裂能的唯一性,有效地消除混凝土塑性损伤分析中的单元尺寸效应。利用本文开发的有限元程序对混凝土单轴受拉和koyna重力坝地震损伤分析的实例计算表明,本文提出的方法是有效可行的。
This paper discusses element-size effect on nonlinear analysis of concrete.Crack strain is considered as a function of crack displacement and element length at the integration point,and a model of fracture energy and blunt crack band is developed.This model is used to improve the plastic-damage model in ensuring the uniqueness of fracture energy and effectively eliminating the element-size effect on plastic damage analysis of concrete.Application of these models to a case study of koyna gravity dam shows that the proposed method is effective in simulation of concrete uniaxial tension and analysis of seismic damage.
出处
《水力发电学报》
EI
CSCD
北大核心
2011年第6期52-56,共5页
Journal of Hydroelectric Engineering
基金
水利部公益性行业科研专项(201001035
200901054)
中国水科院专项极限地震下混凝土坝抗震安全研究(抗集1026)
中国水科院博士创新基金(2011)
国家自然科学基金(51079164
91010006)
关键词
塑性力学
混凝土塑性损伤
单元尺寸效应
断裂能
钝裂缝带模型
theory of plasticity
concrete plastic-damage
element-size effect
fracture energy
blunt crack band model
