| 马克生,龚晓南.柔性桩沉降可靠性的简化分析公式[J].水利学报,2001,32(2):0063-0069 |
| 柔性桩沉降可靠性的简化分析公式 |
| Simplified formula for settlement reliability analysis of flexible piles |
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| DOI： |
| 中文关键词: 可靠度 随机场 柔性桩 |
| 英文关键词: reliability simplified formula random flexible pile |
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| 中文摘要: |
| 本文提出了结合分层的剪切位移法、摄动法和随机场理论来计算柔性桩沉降可靠度的简化方法，并用随机有限元和蒙特卡洛模拟法对此简化模型的精度进行了对比分析，分析结果表明该方法计算简便，精度较高。通过算例发现，在土的变形模量为小变异的情况下，其概率模型对桩的沉降可靠度影响不明显，因此其概率模型可近似采用正态分布；在土的变形模量为大变异的情况下，其概率模型对桩的沉降可靠度影响非常明显，在选择概率模型时要慎重。对于土的变形模量服从对数正态分布的情况，采用将其当量正态化后的中心点法即使在参数大变异的情况下也可以获得理想的计算精度。 |
| 英文摘要: |
| Based on the layered shear displacement method, perturbation method and random field theory, this paper presents a simplified method for calculating the settlement reliability index of flexible piles. The precision of this method is verified by SFEM and Monte Carlo method. It is found that the probability model has little effect on reliability index, if the variation of soil deformation modulus is small, and the normal distribution can be selected as the probability model of soil. When the deformation modulus of soil is logarithmic normal distribution, even if the variation is large, reasonable precision can be obtained by center point method, in which the deformation modulus of soil is normalized equivalently. |
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