摘要
在Moelands-Reinhardt指数型本构模型的基础上,利用等效应变假设,得出钢纤维混凝土损伤演化方程。为消除损伤演化方程中单元特征长度参数的网格相关性,同时体现抗拉强度、断裂能对损伤演化方程的影响,进一步提出修正的钢纤维混凝土损伤演化方程。修正的损伤演化方程可综合反映钢纤维体积率和长径比对劈拉损伤演化的影响。通过对比劈拉试验轴向位移-轴向力曲线与由损伤演化方程控制的轴向位移-轴向力理论曲线,证明钢纤维混凝土损伤演化方程可基本体现其劈拉损伤演化的规律。
Based on Moelands-Reinhardt single parameter exponential constitutive equation, steel fiber concrete damage development equation is obtained using equivalent strain hypothesis. Modified damage development equation of steel fiber concrete is proposed for eliminating mesh correlation of element characteristic length and reflecting the action of tensile strength and fracture energy on the damage development equation. The modified damage development equation comprehensively reflects the action of steel fiber volume ratio and aspect ratio on damage development. Relation of displacement force is obtained by splitting test and theoretical relation of dlsplacement-force obtained by damage FEM calculation. Through comparison of empirical D-P relation and theoretical D-P relation, damage development equation of steel fiber concrete is verified in this paper.
出处
《工业建筑》
CSCD
北大核心
2009年第6期92-95,78,共5页
Industrial Construction
基金
浙江省教育厅资助项目(Y200803660)
关键词
钢纤维混凝土
劈拉
损伤演化方程
steel fiber concrete
splitting
damage development equation
