摘要
依据建筑抗震设计规范反应谱曲线,同时考虑SSI效应对隔震结构及非隔震结构水平地震作用的影响,建立了软弱场地上考虑SSI效应的隔震结构水平向减震系数的简化算法。在此基础上给出了软弱场地上考虑SSI效应的隔震结构计算流程,深入研究了考虑SSI效应的隔震结构水平向减震系数在不同影响参数下的变化规律。通过参数研究发现:软弱场地条件下多层隔震结构考虑SSI效应的的水平向减震系数随波速参数、周期比和高宽比的增大而增大,相应的隔震效果越差;而软弱场地条件下高层隔震结构在达到一定的周期比时,考虑SSI效应的水平向减震系数随波速参数的增大而增大,但增幅较小,考虑SSI效应的水平向减震系数随高宽比的增大而减小。研究表明:软弱场地条件下隔震结构经过合理的设计,水平向减震系数可达到预期值,隔震结构能取得较理想的隔震效果。
According to the response spectrum curve of code for seismic design of buildings, the influence of the SSI effect on seismic dynamic load of isolated structure and non -isolated structure is considered, simplified calculation method of seismic reduction factor for multiple-story on soft sites with SSI effect is established, calculation process for the design of isolated structure on soft sites with SSI effect is given, the law of variability of seismic re- duction factor with SSI effect is analyzed when influence factors are changed. It is demonstrated through the factors research that seismic reduction factor of multiple-story isolated structure with SSI effect becomes larger with wave velocity parameter, ratio of period and depth-width ratio larger, and its isolation efficiency becomes lower, when multiple-story isolated structure lies on soft sites. However, seismic reduction factor of high-rise isolated structure with SSI effect becomes slightly larger with wave velocity parametre larger, and it becomes lower with depth-width ratio larger, when high-rise isolated structure meets certain requirement for ratio of period on soft sites. This paper findings indicate that isolated structure has a good vibration isolation effect, and its seismic reduction factor comes up to expected values, when the isolated structure designs reasonably on soft sites.
出处
《世界地震工程》
CSCD
北大核心
2017年第3期183-191,共9页
World Earthquake Engineering
基金
国家自然科学基金面上基金资助项目(51778282)
南京工程学院校级科研基金项目(CKJA201505
JCYJ201618)
关键词
隔震结构
软弱场地
水平向减震系数
SSI效应
isolated structure
soft site
seismic reduction factor
soil-structure interaction
