条形桩基承台梁随机优化分析

在考虑基桩承载力差异性和桩土共同工作等因素的基础上引入随机优化分析理论。提出了基桩承载力随机生成的计算机方法，并采用遗传算法对承台梁内力进行随机分析．结合工程实例，进行了比较计算．计算结果表明，基桩刚度变异系数、梁下土体分段数对承台梁节点的弯矩影响不大，最大负弯矩值相差不到1％，且在对称荷载下，基桩刚度一致的承台梁弯矩最为均匀．

Random Optimum Analysis of Strip Foundation Beams of Pile

According to the complex behavior of strip foundation beams of pile, the internal stress distribution of foundation beams is influenced by the indetermination and random of the bearing capacity of pile foundations under the beams. Based on the influence of the pile bearing capacity variance and the soil-pile interaction, a random optimum theory was introduced, and a random computation method of the capacity of pile foundation and the genetic algorithm were presented. The comparative calculation was done with the data from engineering instances, and the calculation result showed that the variability coefficient and different subsection number of soil had little influence on the moment of the foundation beam and the difference of maximal negative moment value was less than one percent, and the foundation beam which had uniform pile stiffness had well-proportioned moment under the effect of symmetrical load.