| 陈樟福生,李庆斌.混凝土动态双轴强度探讨[J].水利学报,2008,39(4): |
| 混凝土动态双轴强度探讨 |
| Dynamic strength of concrete under biaxial stress |
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| DOI： |
| 中文关键词: 混凝土 动态双轴强度 应变率 |
| 英文关键词: concrete biaxial dynamic strength strain rate strength prediction |
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| 摘要点击次数: 3043 |
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| 中文摘要: |
| 本文根据单轴和等压双轴的动态强度的特性，提出用一抛物线方程和双曲线方程来模拟拉-压区和压-压区的强度变化规律，方程的参数是单轴动态强度的函数。在拉-压区和压-压区分别推导出混凝土的动态强度，建立了完整的混凝土静、动态双轴强度包络线。为了得到一致的动态强度准则，建立了统一静态应变率下的混凝土动态单轴抗压强度和动态单轴抗拉强度与应变率的关系式，并根据已有的试验结果，建立了类似的等压双轴动态强度变化关系式，以用于双轴动态强度预测。根据本文方法得到的包络线在拉-压区和压-压区连续光滑，预测的动态双轴强度与已有的试验结果吻合较好，可作为工程实际应用的参考值。 |
| 英文摘要: |
| The mechanical behavior of concrete under dynamic loading such as earthquake is considerably different from its static characteristics. In this paper a simple method for predicting the strength of concrete under biaxial dynamic stress is proposed. A parabolic equation and a hyperbolic equation are suggested to express the strength of concrete in biaxial stress state. The parameters of the equation are functions of uniaxial dynamic strength. Based on the available experimental results for strength of concrete under biaxial stress the dynamic strength criterion of concrete under biaxial stress is attained and the complete strength envelop of concrete under biaxial stress is established. In order to obtain a consistent dynamic strength of concrete criterion, the relationship between uniaxial dynamic compressive strength and tensile strength under the same static strain rate is established and the expression describing the variation of dynamic strength of concrete under equal biaxial pressure is obtained from the experimental result for predicting the dynamic strength. The predicted strength is in good agreement with the experimental data. |
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