板-复合地基动力分析半解析元法  

A semi-analytical method for dynamical analysis of slab and compo site foundation

作　　者：刘丽萍[1] 黄义[2] 李向阳[3] 

机构地区：[1]上海申通轨道交通研究咨询有限公司 [2]西安建筑科技大学理学院,西安710055 [3]同济大学地下建筑与工程系,上海200092

出　　处：《岩土力学》2007年第4期753-757,762,共6页Rock and Soil Mechanics

摘　　要：将复合地基视为横观各向同性材料,利用半解析数值方法的基本原理分析板-复合地基动力相互作用问题,克服有限元法中人为设定计算边界的弊端,提高了计算精度,并将三维问题转化为一维问题计算,显著减少了计算工作量。通过改变复合地基置换率、加固深度和桩土模量比,研究了板-复合地基体系动力特性的变化规律。计算结果表明,增大加固深度、置换率和桩土模量比对系统频率和振幅均有影响,并使频率有一定的提高,动力基础设计时,应注意复合地基置入对基础动力特性改变的影响。Composite ground can be regarded as transversely isotropic material. Semi-analytical element method is used to study the dynamic interaction of slab and composite foundation. It can avoid introducing redundant boundary condition compared with FEM, and improve computation accuracy. Furthermore it can simplify 3-dimensional computation to one dimension, saving computation time dramatically for its quick convergence. The dynamic property of slab and composite ground is investigated by means of changing substitution ratio, reinforced depth and modulus ratio of pile to soil. The results indicate that the increment of these factors can affect the amplitude of vibration and increase the system＇s frequency. So when designing the foundation of power machine, some attention should be paid to the impaction of composite ground on the alteration of dynamic property of ground.

关 键 词：半解析有限元 复合地基 相互作用 动力特性 

分 类 号：TU470.3[建筑科学—结构工程]