摘要
在超高层建筑基岩地震动时程分析中,常规的分析方法存在地震动设计谱与反应谱拟合障碍的问题,导致时程分析方法选波容错率与合格率较低。为了解决这一问题,提出超高层建筑中考虑相位随机性的基岩地震动时程分析。分析基岩土层结构,剖析出场地土层参数,计算地震动反应谱,以基岩半空间上土层作为目标,反演基岩地震动,计算水平方向和垂直方向的加速度时程量以及基岩入射角,在考虑相位随机性的情况下,将相位差谱转换为功率谱和反应谱,经过傅里叶的转换与计算,得到时程功率谱和地震动场,经过拟合和合成,得到基岩地震动时程。测试结果表明:设计的考虑相位随机性的地震动时程分析方法在选波中容错率和合格率都比较高,整体适用性更好,符合地震动时程分析要求。
In the time history analysis of foundation rock ground motion of super high-rise buildings, there is a problem of the fitting obstacle between the design spectrum of ground motion and the response spectrum in the conventional analysis method, which leads to the low fault tolerance rate and qualified rate of the wave selection method.In order to solve this problem, the time history analysis of bedrock ground motion considering phase randomness is proposed.Analysis of rock soil layer structure, analysis of site soil parameters, the calculation of the ground motion response spectrum, the bedrock on half space soil as target, inversion of bedrock ground motion, calculation of horizontal and vertical acceleration time history and the incidentangle for the foundation, under the condition of considering the random phase, the phase difference spectrum transform for power spectrum and response spectrum, through fourier transformation and calculation, the time-history power spectrum and ground motion field are obtained, and the time-history of bedrock ground motion is obtained through fitting and synthesis.The test results show that the designed time-history analysis method of ground motion considering phase randomness has high fault-tolerance rate and pass rate in wave selection, and has better overall applicability and meets the requirements of ground motion time-history analysis.
作者
杨连
林雄伟
王军
YANG Lian;LIN Xiongwei;WANG Jun(Fujian Geotechnical Engineering Investigation and Research Institute Co.,Ltd.,Xiamen 361000,China)
出处
《粉煤灰综合利用》
CAS
2022年第1期39-43,49,共6页
Fly Ash Comprehensive Utilization
关键词
超高层建筑
相位随机性
基岩
地震动
时程分析
反演
super high-rise building
phase randomness
the bedrock
the ground motion
time history analysis
the inversion
