内圆外方双层箍筋约束下的混凝土轴心受压力学试验研究  

Research on mechanical characteristics of square concretes with double stirrup

作　　者：沙丽荣[1] 胡家梁[1] 

机构地区：[1]吉林建筑大学土木工程学院,吉林长春130118

出　　处：《混凝土》2016年第5期35-37,44,共4页Concrete

基　　金：国家自然科学基金(51406067);吉林省自然科学基金(201215048)

摘　　要：对12组不同形式的箍筋混凝土柱进行轴向受压力学试验,按照箍筋类型不同分为四组对比做其破坏条件和破坏状态,研究了不同配箍率对混凝土承载力的影响,以及箍筋形状对承载力的影响,得到应变-应力曲线。试验表明双层箍筋柱约束的混凝土强度明显优于单层箍筋,发现配箍率特征值的提升可以提高其延性,但效果不甚明显,内部圆形的箍筋形式更易提高承载力。同时通过有限元软件对箍筋约束下的混凝土力学性质进行分析,通过对约束混凝土轴心受压状态下的破坏极限及变形形式进行模拟,模拟结果试验结果相一致。In 12 groups of different forms of reinforced concrete columns with axial stress experiment, according to the different types of stirrups for between four groups to do the damage condition and damage state and to study the effects of different stirrup ratio on bearing capacity of concrete and stirrup shape effect on the bearing capacity of the obtained strain - stress curve.Experiments show that double stirrup columns confined concrete strength is obviously superior to the single stirrups, found that the ascension of the stirrup characteristic value can improve the ductility, but the effect is not very obvious, internal circular hoop reinforcement form tend to improve the bearing capacity. Also through the finite element software of confined concrete mechanical properties analysis, through the failure limit of con- fined concrete under axial load and deformation model, the simulation results consistent with the results.

关 键 词：力学性能 箍筋形式 配箍率 约束混凝土 

分 类 号：TU528.01[建筑科学—建筑技术科学]