摘要
箍筋约束作为一种被动约束方式,对于混凝土单轴受压峰值强度、峰值点应变和下降段延性有显著影响。通过历史和逻辑两条线索对箍筋约束混凝土研究的发展进行较为全面的阐述,并具体分析了若干典型本构模型。发现箍筋约束混凝土本构模型建立的主流思想为:将箍筋约束效应等效为均匀围压,并利用均匀围压这个媒介性变量建立配箍与应力应变全曲线关键参数(峰值强度、峰值点应变和下降段延性)之间的关系,此种建模方法形成于早期Richart的研究,并一直以来占主导地位。此外,通过采用不同模型预测某一试验结果,发现各模型的预测会产生显著的差别。基于此,建议更为深入的研究箍筋约束机理并采用物理机制更为明确的素混凝土本构曲线。
As a passive confinement method, transverse steels confinement produces significant effects on the behavior of concrete under axial compression, including the improvement of the maximum stress, the corresponding strain and the ductility. From both historical and logical perspectives, the development of hoop confined concrete is summarized, and several important models are studied specifically. The main method in modeling adopted by most studies is ： using equivalent mean perimeter pressure to repre- sent the confinement effect produced by lateral steels, and then connect with several key parameters of the stress - strain relation. This modeling method was firstly suggested by Richart in 1929, then it~ been accepted by most studies. Because of that most of the models are empirical ones, the prediction about a specific case by different models will be obvious different. Based on this, further research of confinement from mechanics perspective and a more reasonable concrete model are needed in modeling hoop confined concrete.
出处
《盐城工学院学报（自然科学版）》
CAS
2014年第2期42-47,共6页
Journal of Yancheng Institute of Technology:Natural Science Edition
基金
高等学校博士学科点专项科研基金新教师类课题(2012007212007)
关键词
箍筋约束
混凝土全曲线
延性
物理机制
hoop confinement, concrete stress - strain curve, ductility, physical mechanism
