摘要
塑性混凝土作为一种介于普通土与混凝土之间的特殊材料,其在峰值强度之前表现出硬化特性,破坏之后的变形现象更为复杂,表现出受围压影响的应变软化特征。为描述塑性混凝土的力学特性,本研究在室内三轴试验基础上,以微裂缝作为损伤基元,利用Weibull分布理论和Lemaitre应变等价原理构建塑性混凝土损伤演化方程,并引入硬化土模型中,建立了考虑损伤效应的弹塑性本构模型,并通过ABAQUS及子程序对新模型进行数值实现。模拟结果与试验结果对比发现:新模型计算结果与试验结果吻合较好,不仅能描述塑性混凝土的峰前应变硬化特征,还能呈现出随围压变化的峰后应变软化效应。研究表明所建模型能较好地描述塑性混凝土的力学特性。
Plastic concrete,a unique material situated between soil and conventional concrete,exhibits hardening characteristics before reaching peak strength.After failure,its deformation phenomena becomes increasingly complex,displaying strain-softening effects influenced by confining pressure.To characterize the mechanical properties of plastic concrete,a damage evolution equation is constructed based on indoor triaxial tests.This equation incorporates micro-cracks as the fundamental damage units,utilizing Weibull distribution theory alongside Lemaitre’s strain equivalence principle.Additionally,an elastoplastic constitutive model is developed by combining the hardening soil model with a damage evolution equation that accounts for damage effects.The new model is numerically implemented using ABAQUS and its subroutines.Comparative analysis of simulation results with experimental data demonstrates that the new model aligns well with experimental findings,capturing both pre-peak strain hardening characteristics and the post-peak strain softening effects associated with varying confining pressures.The findings indicate that the model accurately characterizes the mechanical behavior of plastic concrete.
作者
赛冬拉·马学义
崔溦
江志安
张宝增
SAI DONG LA·Maxueyi;CUI Wei;JIANG Zhian;ZHANG Baozeng(State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300072,China;Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration,Tianjin University,Tianjin 300072,China;SINOHYDRO Foundation Engineering CO,LTD,Tianjin 301700,China)
出处
《水利学报》
北大核心
2025年第7期920-932,共13页
Journal of Hydraulic Engineering
基金
国家自然科学基金面上项目(52479131)。
关键词
塑性混凝土
损伤效应
本构模型
三参数WEIBULL分布
二次开发
plastic concrete
damage effects
constitutive model
three parameter Weibull distribution
secondary development
