高耸塔体结构抗震设计的动力相互作用模型研究  

Study on the dynamic interaction analysis methods for the earthquake-resistance evaluation of high-rise tower structures

作　　者：李建波[1] 肖琴[2] 林皋[1] 

机构地区：[1]大连理工大学建设工程学部抗震研究所,辽宁大连116024 [2]中国石化工程建设公司,北京100101

出　　处：《世界地震工程》2010年第2期7-12,共6页World Earthquake Engineering

基　　金：国家自然科学基金项目(50809013);高等学校博士点基金(200801411099);清华大学水沙科学与水利水电工程国家重点实验室开放基金项目(sklhse-2010-C-30)

摘　　要：基于高耸塔体结构多质点简化力学模型,以动力方程附加项的形式提出一种简便的地基边界统一处理模式,用于对比刚性地基、伏格特弹性地基及集总参数无限地基的影响。结合工程实例,以时程法探讨结构的抗震性能,结果显示伏格特地基条件给出了结构动力响应的上界,无限地基条件则给出了下界,可明确为结构的响应区间,保证必要的安全储备。而在简便材料力学模型的基础上,探讨复杂的结构-地基-水体动力相互作用,利于工程人员接受,也是传统简便设计方法向已考虑复杂因素为特征的新设计方法过渡的体现。To meet the requirement of practical engineering design,a simplified numerical mechanical model is presented on the basis of the lumped-mass model of a high-rise tower structure,in which main affecting factors on the structural dynamic responses are compared and investigated,such as various infinite base models,different water levels,and etc.By directly adding to the flexibility matrix of structure,a uniform processing method is also proposed for coping with the different soil condition models,namely,rigid foundation,Voigt elastic foundation and lumped-parameter model of infinite soil.The numerical models of soil in the practical example are shown that the Vogt elastic foundation model gives the upper bound of structural dynamic response,and the infinite soil model gives the lower bound.With small amount of computation required,the credible range of structural safety analysis can be easily confirmed based on the comparison of numerical results for different soil models,which also give strong supports for the design of structural necessary safety margin.The proposed simplified dynamic mechanical model can be expediently used to the dynamic interaction analysis of high tower structure-foundation-water system,which can be easily accepted by common engineers.So it can also be regarded as a symbol of the transition from the traditional design method to the modern design method with considering complicated factors.

关 键 词：高耸结构 多质点体系模型 动力相互作用 无限地基 

分 类 号：O313[理学—一般力学与力学基础] TU311.3[理学—力学]