混凝土动态特性及其机理研究
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摘要
地震作用下混凝土动力反应和破坏过程极其复杂,结构的抗震设计是否安全、合理,不仅取决于抗震动力分析,而且取决于设计采用的地震动参数和混凝土材料动态力学参数,故而混凝土动态特性研究对公路、桥梁、大坝等结构的设计有着重要的意义.文章回顾了混凝土动态特性这一课题的研究历史,按时间顺序介绍了国内外的研究进展,以及混凝土动态强度特性、变形特性的有关试验研究成果,讨论了分离式霍普金森压杆(SHPB)、电液伺服系统、落锤、轻气炮、板冲击系统和声发射等材料动力试验设备的原理及其适用范围,并根据试验结果的分析和比较,对混凝土动态特性的率敏感性的机理进行了探讨,最后指出混凝土动态特性这个研究热点,在试验研究、理论分析及数值模拟等方面需要解决的问题,为进一步的研究提供参考.
Dynamic response and failure process of concrete structures under earthquake are very complicated . Safety and reasonableness of structures' earthquake-resistance design rely not only on dynamic analytical methods of earthquake-resistance, but also on parameters of earthquake motion and dynamic mechanical parameters of concrete. It is significant to study dynamic behavior of concrete for the design of structures such as highways,bridges and dams. This paper reviews the study history on the subject of dynamic behavior of concrete. In the chronological order,study advance on the subject is introduced. Then experimental results of dynamic strength and deformation property are presented. The paper discusses the principles and the scope of application of dynamic test equipments such as SHPB,electro-hydraulic servo system,drop weight,light air gun,plate impact system and sound emission. Based on the analysis and comparison of test results,the mechanism of rate-sensibility of concrete is discussed. Finally, this paper points out the problems needed to be solved in experiment study,theoretic analysis and numerical simulation of dynamic behavior of concrete,which will provide a reference for further study.
Dynamic response and failure process of concrete structures under earthquake are very complicated . Safety and reasonableness of structures' earthquake-resistance design rely not only on dynamic analytical methods of earthquake-resistance, but also on parameters of earthquake motion and dynamic mechanical parameters of concrete. It is significant to study dynamic behavior of concrete for the design of structures such as highways,bridges and dams. This paper reviews the study history on the subject of dynamic behavior of concrete. In the chronological order,study advance on the subject is introduced. Then experimental results of dynamic strength and deformation property are presented. The paper discusses the principles and the scope of application of dynamic test equipments such as SHPB,electro-hydraulic servo system,drop weight,light air gun,plate impact system and sound emission. Based on the analysis and comparison of test results,the mechanism of rate-sensibility of concrete is discussed. Finally, this paper points out the problems needed to be solved in experiment study,theoretic analysis and numerical simulation of dynamic behavior of concrete,which will provide a reference for further study.
引文
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