acceleration history meaning in English
加速度随时间的变化
Examples
- With the input of a vibration acceleration history of subway train , a full dynamic analysis of soil - pile - structure is carried out . the propagation of vibration wave on the ground and vibration responses of the huge platform and the storied buildings are analyzed . some conclusions are drawn as follows : ( 1 ) with the increase of the distance to the vibration source , vibration intensity of the ground decreases ; ( 2 ) the vibration intensity of the ground in vertical direction is slightly larger than that in horizontal direction ; ( 3 ) with the increase of the distance to the vibration source , the situation that the vibration intensity of each building in horizontal direction is maximum at highest and lowest story whereas minimum at the middle story changes gradually to that decreasing with the height of building ; ( 4 ) in vertical direction , the vibration velocities and accelerations at the end points of each story of a building are the nominal identical , which indicates that the vertical vibration of them is unanimous ; ( 5 ) the vibration intensity in vertical direction of a building is larger than that in horizontal direction ; ( 6 ) increasing of the elasticity of track is an effective way to abate vibration of ground and buildings
本文以北京地铁八王坟车辆段地上超大结构(车辆段大平台及其上的小区楼房)及其地基基础为研究对象，在研究和分析有关资料的基础上，用快速拉格朗日有限差分法软件flac建立了二维数值分析模型，并以列车振动加速度时程作为模型输入，进行了地基?桩基础?地上结构的整体动力学分析，分析了地铁列车运行产生的振动在地面的传播规律及其对地上结构的影响，得到了如下结论： ( 1 )随着与地铁线路距离的增大，地面的振动强度有减小的趋势； ( 2 )地面竖直方向的振动强度较之水平方向的略大； ( 3 )随着与振源距离的增大，在水平方向上，地上各幢楼房的振动强度由底层和顶层的最大、中间层的最小逐渐过渡到沿楼层增高而减小； ( 4 )在竖直方向上，每幢楼各层端点的振动速度、加速度完全相同，表明楼房各层在竖直方向上的运动状态一致； ( 5 )各幢楼房竖直方向的振动强度比水平方向的大； ( 6 )增加轨道弹性是减轻地面和地上建筑振动的有效途径。 - Based on the assessment of seismic risk of surrounding rocks , three sections are selected to perform fem calculating using ground acceleration history of different engineering properties as input . through study of the displacement and stress fields of grotto surrounding rocks under ground motion of different pga , frequency spectrum and duration , the influence of structure of grottoes and neighboring grottoes on dynamic damage and stability of country rock is discussed
通过对不同地震动峰值加速度( pga ) 、不同频谱、不同持时作用下,锚索加固洞窟围岩的位移场和应力场特征的研究,探讨了不同地震动作用下,洞窟的结构及洞窟之间的组合关系对围岩动态损伤及稳定性的影响。 - Based on hundreds of actual site profiles collected in china , 1281 typical profiles were selected or constructed , which were used for studying three kinds of soil layer profiles containing soft layers that locate at the bottom , in the mid or on the top of them . 480 acceleration histories were formed artificially , which can express the different characters of ground motions and be used as the ground motion inputs in the study
在整理分析全国各地诸多实际工程场地钻孔资料的基础上，从中选取和构造了1281个研究三种不同土层结构的场地计算模型；合成了480条能够反应不同地震动特征的加速度时程曲线，并将其作为土层地震反应分析的地震动输入。