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中文摘要：
研究了桩式复合地基的失效模式，将模糊逻辑引入到桩式复合地基的可靠度分析中，解决了地基失效时的模糊性问题．同时利用熵原理和牛顿迭代法计算出功能函数的熵密度函数，不仅避免了对经典概率分布的依赖，而且保证了在计算中迭代的收敛性．最后利用辛普森积分公式推导出桩式复合地基的模糊失效概率公式．实例分析表明，该方法具有精度高、计算简便的优点．
英文摘要：
The failure model of piled-composite foundation （PCF） was studied. The fuzzy logic was employed to analyze the reliability of PCF, which solves the fuzziness of foundation, meanwhile the entropy principle and the Newton iteration were used to compute the entropy density function of the performance function, thus not only the reliance of the classical probability distribution functions was successfully escaped, but also the convergence of itertion was ensured. Finally, the computation formula of the fuzzy failure probability of PCF was deduced using Simpson integral formula. It is demonstrated through the example that the method presented has the advantages of high accuracy and convement computation.
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