中低强度混凝土动态弯拉特性的试验研究

Experimental study on the dynamic bending properties of low strength concrete

本文采用MTS试验机对C35和C40两种强度的混凝土进行了动态弯拉试验，应变速率分别为10—6／s、10—5／s和10—4／s。试验中以10—6／s速率下得到的数据作为拟静态状态，并以此作为其它速率下得到实验数据的对比依据。实验结果表明：随着应变速率的增加两种强度混凝土的弯拉强度有明显增加的趋势；两种强度混凝土的弯拉峰值应变随着应变速率的增加而提高。

In this article,we have used MTS testing machine to test both the C35 and C40 dynamic bending strength of concrete test. The rate of strain is 10-6/s, 10-5/s and 10-4/s. In the experiment the data achievement which obtains by the 10-6/s speed Under draws up the static condition, and as other rates are compared on the basis of experimental data.The experiment result expresses ：with the increase of strain rate, the trend of the flexural strength of two kinds of concrete increases obviously ; the flexural failure strains of two kinds of concrete increase with the increase of strain rate.