中文摘要：

历经荷载历史的混凝土动态抗弯拉力学性能的研究非常重要．本文在前人研究的基础上，利用MTS加载装置和先进的数据采集仪，采用适当的试件制作方法和加载工艺，当应变速率分别为10^-6S^-1、10^-5S^-1、10^-4S^-1时，对强度为C40的混凝土试件，进行相应的动态抗弯拉试验，分析了应变速率和应力历史对混凝土动态抗弯拉力学性能和变形性能的影响．试验结果表明：随着应变速率的增加，经历荷载历史后，混凝土的动态抗弯拉强度逐渐增加，同时，混凝土的动态抗弯拉弹性模量也呈增长趋势，峰值应变较直接加载而言，数值变大，混凝土的泊松比受荷载历史和应变速率的影响不大．

英文摘要：

It is very important to study the concrete dynamic bending performance in the experience of loading history. In this paper, there is a dynamic bending tensile test on the C40 concrete specimens on the basis of summarizing the pre- vious research results, using the MTS loading devices and advanced data acquisition instrument, adopting the appropriate methods of making specimen and loading process. Dynamic bending tensile experiment was carried out at different strain rates, such as 10^-6 s^-1, 10^-5 s^-1, 10^-4 s^-1 and so on. The impact on dynamic bending performance and deformation performance by concrete strain rates and stress history are analyzed. Experimental results show that the dynamical bending strength and elastic modulus of concrete is affected obviously by strain rates and load histories. Peak value of the strain is in growth trend under certain conditions. The effect of the strain and load histories on Poisson＇s ratio is not obvious.