摘要
为研究远场地震动及不同类型近场地震动的反应谱峰值参数比较及其对多层地铁车站结构的影响,挑选远场地震动与三种类型的近场地震动(前方向性、滑冲型、非脉冲)记录共20条。以加速度峰值作为输入地震动的归一化指标。选择基于地震动反应谱计算得到的有效峰值加速度(EPA)、有效峰值速度(EPV)、改进有效峰值加速度(IEPV)、改进有效峰值速度(IEPV)作为指标进行比较。采用有限元方法,对弹塑性四层地铁车站的地震响应进行动力时程计算。结果表明,前方向性与滑冲效应型地震动的EPV及IEPV值较高;具有滑冲效应地震动作用下结构变形更为严重,底层中柱弯矩更大;远场地震动作用下结构响应较小;近场非脉冲地震动作用下结构动力响应明显降低;结构响应随输入地震动的EPV及IEPV值的增大而加剧。
For the study of the difference of response spectrum based inte intensity parameters of different near-field and far-field ground motion on multi-story subway station,a total of 20 ground motion records including far-field ground motion and near-fault ground motion with three different types:forward directivity,fling-step,non-pulse were selected.All seismic waves were normalized with the intesity index:peak ground acceleration.Response spectrum based effective peak acceleration(EPA),effective peak velocity(EPV),improved effective peak acceleration(IEPA),and improved effective peakvelocity(IEPV)were selected as intensity parameters for comparison.The finite elemnt method was used to realize time history analysis of elasto-plastic seismic response of multi-story subway station.The result showed that,both forward directivity and fling-step ground motions have high values of EPV and IEPV.Ground motion with fling step effecttend tocause larger deformation of the structure and bending moment of columns in B4 story;the response of structureunder far-field ground motions tend to be small relatively;near-field records without pulse causes much more slight dynamic responses.The response of structure increases with the improve of EPV and IEPV.
作者
陈之毅
熊求正
CHEN Zhiyi;XIONG Qiuzheng(Department of Underground Structure and Engineering,Tongji University,Shanghai 200092,China)
出处
《结构工程师》
北大核心
2018年第A01期48-53,共6页
Structural Engineers
基金
国家自然科学基金(51778464)
关键词
前方向性
滑冲效应
多层地铁车站
反应谱峰值参数
forward directivity effect
fling-step effect
multi-story subway station
response spectral intensity parameter
