摘要
强震作用下,传统的数值分析本构模型不能考虑钢材的累积损伤、强度和刚度退化现象。为了较准确地模拟钢结构在强震作用下的损伤破坏发展全过程,基于应力三轴度和初始损伤等效塑性应变定义损伤初始准则,利用等效塑性位移与损伤因子定义损伤演化,并对国内外大量钢梁、节点及钢框架实验进行数值模拟验证。结果显示,该方法能够真实地表现结构的强度和刚度退化、损伤部位、损伤程度及损伤发展过程,与实验数据吻合程度较高,具有一定的准确性和可行性。
The cumulative damage,strength and stiffness degradation of steel are not considered in the conventional constitutive model of numerical analysis in the presence of strong shock.In order to accurately simulate the whole process of damage and failure of steel structures subject to strong shock,the damage evolution is defined with equivalent plastic displacement and damage factors according to the initial damage definition criteria based on the stress triaxiality and equivalent plastic strain of initial damage.A large number of domestic and foreign experiments on steel beams,joints and frames were numerically verified.Results show that this method truly represents the strength and stiffness degradation,damage site,damage degree and damage process of structures and highly fits experimental data,with high accuracy and feasibility.
作者
孟春辉
MENG Chun-hui(PowerChina Roadbridge Group Co.,Ltd.,100037,Beijing,China)
出处
《建筑技术》
2024年第16期1938-1942,共5页
Architecture Technology
关键词
钢结构
材料本构
数值分析
损伤失效
刚度退化
steel structure
material structure
numerical analysis
damage and failure
stiffness degradation
