摘要
基于Penzien提出的集中质量法 ,将上部结构和桩基离散为剪切型质点串 ,以弹簧和阻尼器模拟周围土体 ,建立土 -桩 -结构动力相互作用的分析模型 ,给出相互作用参数的确定方法 ,并考虑土体的动力非线性和材料阻尼特性 ,通过等价线性迭代逼近土体的非线性动态响应 .运用此模型对某 180m混凝土烟囱按桩基础和刚性基础两种方案进行自振特性和地震时程反应对比分析 ,得到两种基础形式结构的位移、剪力、弯矩的分布形式基本一致 ,但考虑桩 -土 -上部结构相互作用的桩基础使结构体系的周期延长 ,变形增大 ,剪力和弯矩相应减小 .桩 -土 -上部结构相互作用增加了结构的柔性 。
Based on the lumped masses model developed by Penzien, the soil-pile-structure dynamic interaction analysis model was constructed with a set of bend-shear lumped masses representing the structure, pile group, and with springs, dashpots representing surrounding soil. Calculations were made for interaction parameters with the nonlinearity and damping characteristic of soil taken into consideration. Approximation of equivalent linear iteration was employed to obtain the solution to the governing equation. Free vibration and seismic response analysis in time domain and their comparative analyses were conducted on a 180-metre chimney with two different foundation types: rigidity and pile group foundation, and with the above mentioned model. Some useful conclusions were put forward for the seismic design.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2003年第5期561-564,共4页
Journal of Harbin Institute of Technology
基金
海岸与近海国家重点实验室资助项目 (990 7)
