摘要
本文采用横观各向同性层状弹性模型,模拟半空间上的层状场地,用阻尼器模拟透射边界代替半空间以吸收能量。利用薄层元素法和子结构法,并利用在这种边界下受水平简谐荷载作用下的格林函数,推导了这种场地中竖直单桩在水平-摇摆简谐荷载作用下的横向动力阻抗函数,并用实例计算了不同横观各向同性性质场地下的动力阻抗函数,并由此分析了场地的横观各向同性性质的强弱对单桩的横向动力阻抗函数所将产生的影响。计算表明:弱横观各向同性场地对阻抗函数的影响很小,以至可以忽略这种影响;而强横观各向同性场地对阻抗函数的影响较大,必须考虑其影响。另外,桩头约束的存在与否,对单桩的横向阻抗函数值也有较大的影响,桩头有约束的阻抗函数值要明显大于无约束的阻抗函数值。
In this paper, the model of transversely isotropic layered elastic media was used to simulate the soil ground on halfspace. Using thin element method and substructure method, the dynamic horizontal impedances of single pile, which was embedded in the ground and subjected to harmonic sway-rocking loading at the top of the pile, were derived. The effects of transversely isotropic property of soil on the impedances of pile were analyzed. When the transversely isotropic property is weak, its influence is so small that it can be neglected, but when it is strong, its influence is so big that it must be taken into consideration . It also should be noticed that whether there is restraint or not on top of the pile will have great influence on the impedance function.
出处
《力学季刊》
CSCD
北大核心
2003年第2期205-210,共6页
Chinese Quarterly of Mechanics
基金
国家杰出青年科学基金(批准号:59925820)
关键词
横观各向同性
层状弹性场地
竖直单桩
阻抗函数
transversely isotropic
layered elastic strata
vertical single pile
impedance function
