摘要
设计两种不同层厚的叠层钢板橡胶支座,对其竖向刚度进行测试,检验了支座设计方法的可行性。在上海市某地铁车站附近修建两层砌体结构足尺试验模型,通过改变厚层橡胶支座的类型及布置方式形成4种现场试验工况,检验了基础隔振措施对提高地铁邻近建筑室内舒适度的有效性。试验结果表明:基础隔振措施可使楼板的Z振级减小约19 d B,且隔振频率越低时,舒适度提高效果越明显;合理控制竖向隔振频率与楼板第1阶自振频率的比例关系,是设计基础隔振结构的关键,比例越小时隔振效果越明显;基础隔振虽能明显减小楼板的竖向高频振动,但也同时放大了整体结构的竖向低频振动,舒适度由低频振动控制;基础隔振会使基础部位的峰值速度出现增大现象,但对现代建筑结构的安全性不会构成明显影响。
Two sets of rubber isolators in different thickness were designed and tested in laboratory to verify the feasibility. Then a full-scale two-story masonry model was constructed near a subway station in Shanghai. By verifying the kinds and layout of thick rubber isolators,four different field experimental conditions were designed to verify the effectiveness of base isolation method. Results show that: Z-vibration levels of floorslabs are decreased 19 d B maximally with base-isolation; the lower the resonance frequency,the better the human comfort inside building; the ratio of the structure's vibration isolation frequency to the floorslab 's resonance frequency is the key to the design of subway vibration isolated structures; the lower the ratio,the better the effectiveness; human comfort inside base-isolated structures is controlled by the low frequency vibrations of structures' movement as a whole,though the floorslab's high frequency vibrations are reduced effectively; after base isolation method,the structure 's peak velocity of particle vibration at foundation is amplified,but the influences on structure's safety still be little because modern buildings' mass is great.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2015年第2期35-40,共6页
Journal of Building Structures
基金
国家自然科学基金项目(51408324)
上海市建设交通"十一五"重大科研项目计划(重科2010-002)
关键词
厚层橡胶支座
地铁
舒适度
隔振频率
安全性
laminated thick rubber isolator
subway
human comfort
vibration isolation frequency
safety
