摘要
为了研究碾压混凝土材料在地震作用下的动态力学参数指标变化对大型碾压混凝土结构抗震动力反应和破坏过程的影响,使用改造后的液压伺服压剪试验系统对两种尺寸的碾压成型试块进行不同加载速率下的压剪试验,系统研究了二、三级配本体和层面试件在有法向压应力存在的状态下动态抗剪强度和变形性能。结果发现,碾压混凝土的峰值剪切强度随着剪切速率的增大而增大,增大幅度随着正应力的增大有减小趋势,残余剪切强度则随着剪切速率的增大略有减小,在试验基础上,建立了考虑不同试件类型和加载速率的破坏准则,为地震区的大型碾压混凝土结构层面受动态压剪组合荷载作用的动态分析提供了试验基础。
In order to study the effect of dynamic behavior of RCC （Roller Compacted Concrete） to the dynamic response and failure mechanism of RCC structures under the seismic action, compression-shear loading tests on RCC specimens with two kinds of sizes were carried out at different loading rates using a retrofitted servo-hydraulic compression - shear testing machine. These specimens are of two kinds： body specimens and interface specimens. Considerable emphasis was laid on the dynamic strength and deformation properties of two-graded and three-graded RCC. The shear stress-deforma- tion curves under various normal confining pressures were analyzed and discussed at each loading rate. Test results indibated that both the peak shear strength and its corresponding deformation increased significantly with the confining pressure. Based on the experimental results, a unified formula was derived to demonstrate both the effects of loading rate and the effect of normal stress on the peak shear strength of RCC under combined compressive and shear loadings.
出处
《水利与建筑工程学报》
2016年第2期18-24,共7页
Journal of Water Resources and Architectural Engineering
基金
河海大学水文水资源与水利工程科学国家重点实验室开放基金项目(201349811)
辽宁省自然科学基金(2015020593)
大连大学大学生创新项目(2015030)
