不同应变率下大骨料及湿筛混凝土单轴受压试验研究  

Experimental study on uniaxial compression properties of large aggregate and wet-screened concrete at different strain rates

作　　者：施林林[1] 宋玉普[1] 沈璐[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《世界地震工程》2016年第2期270-276,共7页World Earthquake Engineering

基　　金：国家自然科学基金项目(51079019)

摘　　要：为研究大坝等大体积混凝土结构在地震荷载下材料的动态性能,对大骨料三级配及其湿筛二级配混凝土进行了动态单轴受压性能试验研究（应变率为10-5-10-2/s）。分析了大骨料和湿筛二级配混凝土的抗压强度、应力-应变曲线、初始弹性模量、临界应变与应变速率之间的关系。试验结果表明：不同应变率下的大骨料和湿筛二级配混凝土的破坏形态类似。随着应变率的提高,大骨料和湿筛混凝土的强度和弹性模量随之增加,应变的增加较小,可以认为基本保持不变。根据试验结果建立了大骨料和及其湿筛混凝土的强度、峰值应变、弹性模量与应变率的关系公式。In order to investigate the dynamic properties of the material of mass concrete structure under semis loading, the dynamic uniaxial compression experiments of the large aggregate and wet-screened concrete it carried out （the strain rate is varied from 10^-5/s to 10^-2/s）. the influence of strain rate on strength, stress-strain curves, peak strain, modulus and failure modes and of the large aggregate and wet-screened concrete are analyzed. The experimental results have shown that： The failure modes are similar between the large aggregate and wet-screened concretes at the different strain rate. With the increase of strain rate, the ultimate strength and modulus of the large aggregate and wet -screened concrete is increased, but the peak strains are increased slightly and can be consid- ered to keep constant. Experiential formulas are established on the relationships between strain rate and strength, strain at peak stress and modulus.

关 键 词：大骨料混凝土 应变率 强度 变形 破坏形态 

分 类 号：TU378[建筑科学—结构工程]