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在分析相关试验结果的基础上,系统地对混凝土在单轴动态加载下的强度特征进行了研究分析。结果表明,不仅加载速率对动态强度有着重要的影响,加载速率对材料弹性参数的影响也很大。结果显示:①混凝土在加载初始阶段,应力—应变表现为线性关系,可认为混凝土处于弹性阶段;随着压力的增加,混凝土产生非线性变形,并出现峰后应力下降;②混凝土的抗压极限强度随着加载速率的增加而增加;③混凝土的弹性模量随着加载速率的增加而提高,而泊松比保持不变。最终提出了一种改进的弹性损伤动态强度的本构理论。
Based on the analysis of the related experimental results, the strength characteristics of concrete under uniaxial dynamic loading are studied systematically. The results show that not only the loading rate has an important influence on the dynamic strength, but also the loading rate has a great influence on the material elastic parameters. The results show that: (1) The stress-strain behavior of concrete is linear at the initial stage of loading, and it can be considered that the concrete is in the elastic stage. With the increase of pressure, the concrete produces nonlinear deformation and the stress decreases after peak; (2) The strength increases with the increase of loading rate; ③ the elastic modulus of concrete increases with the increase of loading rate, while the Poisson’s ratio remains unchanged. Finally, an improved constitutive theory of the dynamic strength of elastic damage is proposed.