| 杜修力,王 阳,路德春.混凝土材料的非线性单轴动态强度准则[J].水利学报,2010,41(3): |
| 混凝土材料的非线性单轴动态强度准则 |
| Non- linear uniaxial dynamic strength criterion for concrete |
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| DOI： |
| 中文关键词: 混凝土材料 动态荷载 应变速率 非线性 强度准则 动力增长因数 |
| 英文关键词: concrete,dynamic load,strain rate,nonlinear,strength criterion,dynamic increase factor |
| 基金项目: |
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| 中文摘要: |
| 在混凝土材料单轴动态强度试验研究成果的基础上,提出了混凝土材料强度增长幅值的动力增长因数与对数应变速率之间关系的微分方程,进而建立了混凝土材料的非线性单轴动态强度准则,即J准则在此基础上,通过引入强度增长幅值的最大动力增长因数,将J准则改进为能描述混凝土材料动态峰值强度特性的S准则利用国际上已取得的混凝土材料单轴动态强度试验结果对J准则和S准则进行了验证,并与双线性动态强度准则比较表明 J 准则与 S 准则都可较好地描述混凝土材料的非线性动态强度特性,J准则和S准则材料参数少,具有统一的表达式,强度曲线连续光滑,且S准则可反映混凝土材料单轴动态极限强度. |
| 英文摘要: |
| A differential equation is proposed to express the relationship between dynamic increasing factor of strength increasing amplitude and logarithm strain rate of concrete based on experimental results of uniaxial dynamic strength tests. On this basis，a non- linear uniaxial dynamic strength criterion of concrete，namely J criterion is established. Furthermore，a maximum dynamic increasing factor of strength increasing amplitude for improving the J criterion to transform into a new criterion，namely S criterion，to describie the dynamic peak strength characteristics of concrete is introduced. The validity of the J criterion and S criterion are verified by published results of uniaxial dynamic strength tests of concrete. Comparing with the bilinear uniaxial dynamic strength criterion，the J criterion and the S criterion are able to satisfactorily describe the nonlinear dynamic strength char acteristics of concrete. Both criteria have fewer parameters，unified expression and continuous smo oth strength curve，and the S criterion is able to reflect the uniaxial dynamic limit strength of concrete. |
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