单轴反复荷载下混凝土动态抗压性能的研究

采用大型静动态电液伺服试验系统,对混凝土试件在不同应变率下进行单轴反复荷载的动态抗压试验,并与单调荷载破坏相比较。通过试验,研究了随着应变速率的变化,混凝土抗压强度、弹性模量、峰值应变、应力应变曲线的性能。试验表明,在相同的应变速率下,混凝土经历多次重复荷载后,其抗压强度下降幅度较大。随着应变率的增大,荷载历史对混凝土强度影响作用在减小。

Experimental research on dynamic compressive properties of concrete under single-axle repeated loading

With the large static and dynamic electro-hydraulic servo testing system,the single-axle dynamic compressive test with the single-axle repeated loading was carried out on concrete specimens under different stain rate.The test studied the properties of concrete compressive strength,elastic modulus,peak strain and stress-strain curve by varying of strain rate.It shows that the concrete compressive strength is decreased in large amplitude after repeated loading under the same strain rate.The effect of loading history on concrete strength is decreased with the increasing of strain rate.