摘要
现有的基础隔震理论大多沿用刚性地基假定,忽略土-结构相互作用。由于地基土的柔性和无限性,土-结构相互作用会对基础隔震体系的隔震机理产生直接影响。因此,考虑土-结构动力相互作用对隔震结构体系隔震效果影响的研究十分必要。本文把地基土视为匀质、各向同性的黏弹性半空间,用等效双线型恢复力模型模拟铅芯橡胶支座的非线性,建立基础隔震体系单质点力学模型和运动方程。通过ANSYS软件进行数值模拟,用D-P材料考虑土的材料非线性,用接触单元模拟土与结构的接触非线性,分析土-结构动力相互作用对铅芯橡胶支座隔震效果的影响。
Most of the existing theories for isolation are based on rigid foundation assumptions and ignore soil-structure interaction.Due to the flexibility and the infinity of the foundation soil,soil-structure interaction will have a direct impact on the base-isolatied system and therefore it is necessary to consider the dynamic soil-structure interaction on the isolation effect.In this paper,the soil is considered to be a homogeneous,isotropic viscoelastic half space,with the equivalent bilinear restoring force model simulating the nonlinear lead-rubber bearing,and the single mass mechanical model is built and the equation of motion of the base-isolated system is derived.Finally,with the help of the ANSYS software,by using DP materials to consider the material nonlinearity of soil and by using the contact element to simulate the contact of nonlinear dynamic interaction,the influence of the soil-structure dynamic interaction on the isolation effect is analysed.
出处
《地震工程与工程振动》
CSCD
北大核心
2010年第3期161-165,共5页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(50678079)
教育部高校博士点基金项目(20092121110001)
辽宁省优秀人才支持计划项目(2008RC24)
辽宁省教育厅重点实验室项目(2008S113)
