摘要
为提高广大村镇地区房屋抗震设防安全,提出了一种基于SSI及非线性土体反应的新型岩土隔震系统,采用橡胶-砂土颗粒混合物作为基坑回填材料进行有效隔震。为验证此隔震系统在地震作用下的动力性能,进行了在不同加速度时程激励强度下的振动台试验研究,并进行了改变不同橡胶土颗粒配比、不同隔震垫层厚度以及不同上部结构配重等条件下的参数分析。振动台试验结果表明此隔震系统在地震作用下具有良好的吸能减振效果,能够有效地保证结构在强震作用下的安全。并对此岩土隔震系统的前景进行了展望,讨论与分析其在工程应用中可能出现的问题与解决方法,表明此新型隔震系统具有隔震性能优良、经济环保、鲁棒性强及易于施工等特点,符合我国建设"两型社会"的发展方向,在村镇地区的普及将带来较好的社会效益与经济效益。
In order to promote the structural safety of buildings in rural areas during earthquakes,an innovative seismic isolation technique,namely 'geotechnical seismic isolation system'(abbreviated herein as GSI),is introduced based on the principles of soil-structure interaction(SSI) and nonlinear soil response phenomena.Rubber-soil mixture(RSM) is facilitated as the main source for the dissipation and absorption of instant earthquake wave energy.A series of prescribed shaking table experimental tests are then conducted to investigate the dynamic performance of the GSI system subject to acceleration time histories with different shaking intensities.Further,by varying the defining parameters of GSI,i.e.,the contents of rubber,thickness of RSM layer,as well as the weight of the superstructure,a comprehensive parametric study is carried out.The experimental results demonstrate the remarkable performance of the GSI system for seismic hazard mitigation purposes.At last,several issues relevant to the potential problems and difficulties of the GSI system in engineering practice are discussed.This study strongly presents the advantages of the GSI system,such as cost-effective,environmentally friendly,robust and easy to constructional applications,which are in line with the national vision and commitment to developing 'two-oriented society' that will beneficially bring in significant social and economic impacts to our nation.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2010年第S2期39-45,共7页
Journal of Building Structures
基金
国家自然科学基金项目(50578062
50808078)
国家科技支撑计划子课题(2006BAJ03A10-06)
高等学校博士点基金项目(20070532090)
湖南省自然科学基金项目(08JJ4016)
湖南省科技计划重点项目(06sk4057)
关键词
岩土隔震系统
试验研究
非线性土体反应
geotechnical seismic isolation(GSI) system
experimental study
nonlinear soil response
