三维混凝土结构“优先开裂”裂缝开展全过程分析

Whole process analysis of cracking development of three-dimensional concrete structure based on principle of “preferential cracking”

目前通用有限元软件所采用的开裂迭代策略往往无法精确、高效模拟混凝土结构开裂过程。在分析研究现有混凝土开裂准则、裂缝模型以及开裂迭代策略的基础上,提出基于"优先开裂"准则的混凝土结构开裂迭代策略,并将其用于混凝土简支梁开裂仿真分析。分析结果表明:该开裂迭代策略无需重新划分网格、可连续自动根据开裂积分点顺序精确模拟裂缝产生、扩展全过程,其计算结果与混凝土结构实际开裂情况较为吻合。

At present,the cracking iterative strategy adopted by general finite element software is often unable to accurately and efficiently simulate the cracking process of concrete structures. Based on the analyses of the existing concrete cracking criterion,crack model and cracking iterative strategy,cracking iteration strategy of concrete structure based on＂preferential cracking＂criteria was proposed and was used for the simulation analysis of simply supported concrete beam cracking.Analysis results show that the cracking iteration strategy does not need remeshing and can accurately simulate cracking generation and expansion process according to the cracking points order continuously and automatically. The calculated results are consistent with the actual cracking condition of the concrete structure.