不同模量的全级配混凝土静动态特性试验研究

全级配混凝土不同模量的特性长期未引起人们的重视．在以混凝土抗拉应力为控制的高拱坝设计中，按不同模量弹性理论进行分析是必要的．在高地震烈度区修建高拱坝，对坝体拉应力的控制更为严格，抗震安全是亟待解决的技术难题．为此，采用液压伺服系统对全级配混凝土试件的静动态拉伸、压缩弹性模量和泊松比进行了三分点静动态弯拉试验．试验结果表明：静动态压拉弹性模量比分别达到0．89，0．87，动态压拉弹性模量比静态压拉弹性模量分别增长5.4％，8．5％；静动态压拉泊松比分剐达到0．88，0．68；动态抗弯强度比静态抗弯强度增加21．7％．

Experimental study on fully-graded concrete in static and dynamic states based on the different modulus elasticity theory

The characteristics of fully-graded concrete of different moduli have not been paid much attentions to over a long period of time. The tensile stress of concrete is normally the key factor in the high arch dam design, so the analysis based on the different modulus elasticity theory is necessary. Especially, if a high arch dam to be constructed is located in a region of high seismic intensity, the earthquake resistance to ensure the dam safety is the most important technical problem to be solved, therefore, the requirement for tensile stress control of the dam body is very high. In the present study, static and dynamic flexural-tensile tests were performed on fully-graded concrete by use of the third point flexural loading method and the electro-hydraulic servo system for the study of the variation of the tension and compression elastic moduli and the Poisson ratios of the concrete in dynamic and static states. The results show that the ratios of compression and tension elastic moduli are 0.89 and 0.87 respectively in static and dynamic states, that the compression and tension elastic moduli in the dynamic state increase by 5.4% and 8.5% as compared with those in the static state, that the compression and tension Poisson ratios reach 0.88 and 0.68 respectively in static and dynamic states, and that the flexural strength of the concrete in the dynamic state is 21.7% greater than that in the static state.