Dynamic Increase Factors for Concrete
Dynamic Increase Factors for Concrete
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发表时间：
1998-08
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通讯作者：
L. Malvar;J. Crawford
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文献类型：
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作者：
L. Malvar;J. Crawford
翻译后摘要：对于钢筋混凝土结构进行爆炸效应，在非常高的应变率（高达1000 s（-1））的响应往往是寻求。在这些高应变率下，混凝土的表观强度可以显著增加。动态增加系数（DIF），即动态与静态强度的比值，通常作为应变率的函数报告。对于混凝土，DIF在压缩时可以大于2，在拉伸时可以大于6。DIF的知识在爆炸物安全结构的设计和分析中具有重要意义。混凝土的DIF曲线已经在三军、国防特种武器局、空军和能源部的手册中公布。然而，这些曲线通常基于有限的数据。通过文献综述，确定了表征应变率对混凝土抗压和抗拉强度影响的现有数据。该数据支持动态增加因子（DIF）是双对数图中应变率的双线性函数。介绍了欧洲行政首长协调会建议的DIF格式及其起源。对于张力，发现数据与CEB的建议略有不同，主要是对于超过1 s（-1）的应变速率，并根据实验数据提出了替代公式。
Abstract : For reinforced concrete structures subjected to blast effects, response at very high strain rates (up to 1000 s(-1)) is often sought. At these high strain rates, the apparent strength of concrete can increase significantly. The dynamic increase factor (DIF), i.e. the ratio of the dynamic to static strength, is normally reported as function of strain rate. For concrete, the DIF can be more than 2 in compression, and more than 6 in tension. Knowledge of the DIF is of significant importance in the design and analysis of structures for explosives safety. DIF curves for concrete have been published in manuals by the Tri-Services, the Defense Special Weapons Agency, the Air Force, and the Department of Energy. However, these curves are typically based on limited data. A literature review was conducted to determine the extant data to characterize the effects of strain rate on the compressive and tensile strengths of concrete. This data support the dynamic increase factor (DIF) being a bilinear function of the strain rate in a log-log plot. The DIF formulation recommended by the European CEB was described, together with its origins. For tension, it was found that the data differed somewhat from the CEB recommendations, mostly for strain rates beyond 1 s(-1), and an alternate formulation was proposed based on the experimental data.