张钦,刘子心,刘章军,2023.考虑脉冲参数随机性的近断层地震动降维建模.震灾防御技术,18(3):471−482.doi:10.11899/zzfy20230305考虑脉冲参数随机性的近断层地震动降维建模1张钦1)刘子心2)刘章军1)1)武汉工程大学,土木工程与建筑学院,武汉4300742)防灾科技学院,中国地震局建筑物破坏机理与防御重点实验室,河北三河065201摘要根据50组近断层脉冲型强震动记录,采用连续小波变换提取最强速度脉冲分量,建立最强速度脉冲峰值时刻的统计模型。对近断层地震动加速度高频分量的演变功率谱模型参数进行识别,并利用谱表示-随机函数方法实现了降维模拟,进而积分得到速度高频分量。对脉冲参数进行随机化处理,并采用改进Gabor小波模型随机模拟速度低频分量。将速度高频分量与低频分量叠加得到近断层地震动速度时程。数值算例表明,近断层地震动加速度代表性时程集合的幅值谱和反应谱均与实测记录拟合一致,验证了降维模拟方法的工程适用性。近断层脉冲型地震动的降维模拟与概率密度演化理论相结合,可实现工程结构的随机地震反应与抗震可靠性精细化分析。关键词:近断层地震动向前方向效应速度脉冲识别降维模拟DimensionReductionModelingofNear-faultGroundMotionConsideringRandomnessofPulseParametersZhangQin1),LiuZixin2)andLiuZhangjun1)1)SchoolofCivilEngineeringandArchitecture,WuhanInstituteofTechnology,Wuhan430074,China2)KeyLaboratoryofBuildingCollapseMechanismandDisasterPrevention,InstituteofDisasterPrevention,ChinaEarthquakeAdministration,Sanhe065201,Hebei,ChinaAbstractBasedon50groupsofnear-faultpulse-likegroundmotionrecords,thestrongestvelocitypulsecomponentwasextractedbycontinuouswavelettransform,andthestatisticalmodelofthepeaktimeofstrongestvelocitypulsewasestablished.Atthesametime,theparametersoftheevolutionpowerspectrummodelofthehighfrequencycomponentofnear-faultgroundmotionaccelerationareidentified,anditsdimensionreductionsimulationisrealizedbyspectralrepresentation-randomfunctionmethod,andthenthehighfre-quencycomponentofvelocityisobtainedbyintegrating.Secondly,thepulseparametersarerandomizedandtheimprovedGaborwave-letmodelisusedtosimulatethelow-frequencycomponentofvelocity.Finally,theprocessofnear-faultgroundmotionvelocityisob-tainedbysu...