基于Arias烈度、梯度场概念下连续型屏障的隔振效果研究  

Vibration isolation effect of continuous barrier based on the concept of Arias intensity and gradient field

作　　者：张希 林本海[1] 罗威力 覃娇芬 ZHANG Xi;LIN Ben-hai;LUO Wei-li;QIN Jiao-fen(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China;School of Construction,Guangdong Polytechnic College,Zhaoqing 526100,China)

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]广东理工学院建设学院,广东肇庆526100

出　　处：《振动工程学报》2022年第6期1493-1500,共8页Journal of Vibration Engineering

基　　金：国家自然科学基金青年基金资助项目(51808147);广东省普通高校青年创新人才项目(2018KQNCX313);广州大学研究生“基础创新”项目(2018GDJC-D14)。

摘　　要：为反映振动信息的三要素:幅值、频谱、持时,引入地震学科的Arias烈度参数,用于研究连续型屏障几何要素改变对隔振效果的影响;同时,为突出屏障隔振效果的整体性,即从空间“场”的角度出发,提出基于一般数值模型的场数据的获得方法。并以此为基础,编制程序计算Arias烈度比值场与梯度场,以比值场与梯度场的变化揭示其隔振作用。结果表明:屏障深度变化基本不会改变Arias烈度比值场的分布形态,它以屏障中心位置为中心,呈现似环形分布,梯度值在近屏障处变化剧烈,远处则变化较缓;屏障长度变化会改变Arias烈度比值场的分布形态,在屏障延伸位置处会出现“第二中心”分布,梯度场在“第二中心”位置处变化剧烈,远处变化也较缓;屏障宽度变化对Arias烈度比值场与梯度场影响不大。In order to reflect the amplitude,frequency spectrum and duration of the vibration information,the Arias intensity parameter of seismic discipline is introduced to study the influence of the change of geometric of continuous barrier on the vibration isolation effect.At the same time,in order to highlight the integrity of barrier vibration isolation effect,that is,from the perspective of spatial"field",a method to obtain field data based on general numerical model is proposed.On this basis,the Arias intensity ratio field and gradient field are calculated by program.Then the vibration isolation effect is revealed by the changes of the ratio field and gradient field.The results show that:the change of depth basically does not change the distribution shape of Arias intensity ratio field.It takes the central position of the barrier as the center and presents a near annular distribution.The gradient value changes sharply near the barrier and slowly in the distance.When the length changes,it will change the distribution shape of Arias intensity ratio field,and the"second center"distribution will appear at the extension position of the barrier.The gradient field changes sharply at the"second center"and slowly at a distance.The change of width has little effect on Arias intensity ratio field and gradient field.

关 键 词：屏障隔振 Arias烈度 烈度比值场 梯度场 势场 

分 类 号：TU352.1[建筑科学—结构工程] TU435