定侧压下混凝土双轴动态抗压性能的试验研究  

Experimental study on the dynamic biaxial compressive properties of concrete under constant confining pressure

作　　者：关萍[1] 

机构地区：[1]大连大学,辽宁大连116622

出　　处：《土木工程学报》2009年第4期33-37,共5页China Civil Engineering Journal

基　　金：国家自然科学基金(90410012)

摘　　要：采用大型静动态电液伺服控制试验系统,对混凝土试件进行一系列恒定侧压下的双轴动态压缩试验,试验的恒定侧向压力分别为0、4MPa、7MPa、10MPa,应变速率分别为10-5/s、10-4/s、10-3/s、10-2/s四个量级。通过试验研究在不同恒定侧压下随着应变速率的增加,混凝土试件的破坏形态、抗压强度、弹性模量、峰值应变、应力应变曲线等力学性能。研究结果表明,随着应变速率的提高,在各种恒定侧压下混凝土的抗压强度和弹性模量均有提高。在高应变速率下,侧压力对混凝土试件抗压强度的影响减弱。Using a large static and dynamic electro-hydraulic servo-controlled testing system, a series of dynamic compressive tests on cubic concrete specimens were carried out under various constant lateral pressures. The lateral confining pressures in the tests were kept constant at 0MPa, 4MPa, 7MPa and 10MPa, respectively, and the strain rates in the tests were 10^-5/s, 10^-4/s, 10^-3/s and 10^-2/s, respectively. The failure mode, compressive strength, elastic modulus, peak strain and stress-strain curve of the concrete specimens were the focus in the tests. Test results indicate that the compressive strength and elastic modulus of the concretes increase with the strain rate. The influence of lateral pressure on the compressive strength of the concrete specimens decreases under high strain rate.

关 键 词：恒定侧压 应变速率 破坏形态 抗压强度 应力应变曲线 

分 类 号：TU502[建筑科学—建筑技术科学]