历经200次动态循环加载后混凝土抗压性能研究

Research on Compressive Behavior of Concrete after 200 Dynamic Cyclic Loading

进行了4种加载制度下的混凝土动态循环200次加载试验,主要考虑不历经往复加载历史以及历经动态往复加载,考虑地震作用机理,揭示了混凝土抗压特性包括抗压强度、极限位移、耗能能力和峰值应变的变化规律;研究表明,在一定的加载频率内,循环加载提高混凝土的抗压强度和耗能能力;在0-2Hz加载频率范围内,随着加载频率的提高,混凝土的抗压强度、极限位移和耗能能力均呈现先提高后降低的趋势。

The dynamic cyclic loading tests of concrete under four loading systems were carried out for 200 times. The compressive properties of concrete, including compressive strength, ultimate displacement, energy dissipation capacity and peak strain, were revealed by considering the history of non-cyclic loading and dynamic cyclic loading of concrete and the mechanism of earthquake action. The results show that cyclic loading can improve the compressive strength and energy dissipation of concrete at a certain loading frequency. In the range of 0-2hz , with the increase of loading frequency, the compressive strength, ultimate displacement and energy dissipation capacity of concrete all show a trend of increasing first and then decreasing.