土-结构相互作用对铅芯橡胶支座隔震效果的影响
|
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.
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.
引文
[1]李忠献,李延涛,王健.土-结构动力相互作用对基础隔震的影响[J].地震工程与工程振动,2003(10):180-181.
[2]林皋,栾茂田,陈怀海.土-结构相互作用对高层建筑非线性地震反应的影响[J].土木工程学报,1993,26(4):1-13.
[3]刘再华,丁强.地基-基础隔震结构系统的动力响应[J].武汉城市建设学院学报,1995,12(2):44-51.
[4]周福霖.工程结构减震控制[M].北京:地震出版社1997.
[5]陈波,吕西林,李培振,等.用ANSYS模拟结构地基动力相互作用振动台试验的建模方法[J].地震工程与工程振动,2002,22(1):126-131.
[6]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.
[7]邹立华,赵人达.土-基础相互作用隔震体系地震随机响应分析[J].计算力学学报,2005,22(2):252-256.
[8]王学庆.考虑土-结构动力相互作用的巨型框架隔震悬挂结构动力响应分析[D].阜新:辽宁工程技术大学,2009.
[9]窦立军,杨柏坡,刘光和.土-结构动力相互作用几个实际应用问题[J].世界地震工程,1999,15(4):62-68.
[2]林皋,栾茂田,陈怀海.土-结构相互作用对高层建筑非线性地震反应的影响[J].土木工程学报,1993,26(4):1-13.
[3]刘再华,丁强.地基-基础隔震结构系统的动力响应[J].武汉城市建设学院学报,1995,12(2):44-51.
[4]周福霖.工程结构减震控制[M].北京:地震出版社1997.
[5]陈波,吕西林,李培振,等.用ANSYS模拟结构地基动力相互作用振动台试验的建模方法[J].地震工程与工程振动,2002,22(1):126-131.
[6]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.
[7]邹立华,赵人达.土-基础相互作用隔震体系地震随机响应分析[J].计算力学学报,2005,22(2):252-256.
[8]王学庆.考虑土-结构动力相互作用的巨型框架隔震悬挂结构动力响应分析[D].阜新:辽宁工程技术大学,2009.
[9]窦立军,杨柏坡,刘光和.土-结构动力相互作用几个实际应用问题[J].世界地震工程,1999,15(4):62-68.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心