复合加载模式下条形基础承载力下限分析

Lower Bound Limit Analysis of Bearing Capacity of Strip Footing Due to Combined Loading

为了求解复合加载模式下条形基础的极限承载力,本文在塑性极限分析理论与Meyerhof"等效宽度"概念的基础上,构造了可变的静力许可应力场,推导了复合加载模式下条形基础承载力的下限解,给出了简易的承载力计算公式.并采用了通用有限元软件ABAQUS进行了数值验证.结果表明,构造的静力许可应力场能够较好地反映地基的破坏模式;推导的基础承载力下限解,能够较好地求解复合加载模式下地基的极限承载力;给出的承载力简易计算公式及下限解答与ABAQUS数值分析结果较吻合.

Based on the effective width of strip footing and the plastic limit analysis theory, a variable static stress field and a lower bound solution of strip footing under combined loading were presented. A simple formula of the ultimate bearing capacity under combined loading was obtained. The finite element＇model （FEM） software ABAQUS was used to verify the rationality and applicability of the lower bound solution and the simple formula. The results show thatthe static stress field under combined loading predicts the perfectly. The bearing capacity is predicted equally well those of ABAQUS. failure mechanism of and the results are soil foundation coincident with