建筑结构学报2018，Vol.39Issue(1)：88-98,11.DOI:10.14006/j.jzjgxb.2018.01.011
基于振动台测试及数值模拟的长周期设计谱评估
Evaluation of long-period seismic spectrum based on numerical simulation and shaking-table test of assembly structures
摘要
Abstract
The shaking-table experiment data of small-scale multi-story and high-rise structural models assembled floor by floor and the numerical analysis data of seismic response of the full-scale structures were employed to evaluate the reliability and rationality of seismic design spectrum for long-period structures.Based on the experimental modal periods and the roof acceleration time history response of structural models,numerical simulation structures were modeled,validated and extended.Excluding the high-order modal components from combined floor acceleration,the dynamic amplification factor(DAF) of the first-order mode at the roof and the equivalent height of single-degree-of-freedom were established accordingly,and used to assess the long-period segment of seismic design spectrum in Chinese code and the proposed design spectrum.The results show that the proportional factor(PF) of the DAF of the first-order mode to the DAF of the floor acceleration,which is based on the SRSS method,increases with the period in the long-period segment of proposed design spectrum,while the PF corresponding to the long-period segment of seismic design spectrum in Chinese code has an abnormal attenuation trend.The DAF of proposed design spectrum has a good agreement with the DAF of the first-order mode,and greater values than those of the DAF of the first-order mode.The DAF of code design spectrum are smaller than the DAF of the first-order mode in the front section of velocity sensitive segment.It is necessary to properly increase the site characteristic period.The floor acceleration spectrum estimated by the proposed design spectrum is greater than that of code design spectrum and that of the experiment and analysis data.Therefore,it is safe for seismic design to use the proposed design spectrum,which can reflect more response of highorder mode of the long-period structures.关键词
装配式结构/长周期地震动/反应谱/振动台试验/数值模拟/动力放大系数Key words
assembly structure/long-period ground motion/response spectrum/shaking-table test/numerical simulation/dynamic amplification factor分类
建筑与水利引用本文复制引用
周靖,方小丹,梁志豪..基于振动台测试及数值模拟的长周期设计谱评估[J].建筑结构学报,2018,39(1):88-98,11.基金项目
华南理工大学亚热带建筑科学国家重点实验室项目(2016KA02,2017KC18),广东省科技计划项目(2017A020219001). （2016KA02,2017KC18）
