As the intensity index of ground motion, PGA (peak ground acceleration) is often employed and analyzed.
作为地震动强度指标，峰值加速度一直是研究最多的物理量。
The ground acceleration could be reduced to some degrees during the roof moving and in non-basic states.
在活动屋盖处于非基本状态或行走过程中，地震作用可适当折减；
The power spectral density function of ground acceleration can be described as filtered white noise applied on each support point.
地面运动加速度功率谱模型为零均值的平稳高斯过程，描述为过滤白噪声施加于支撑各点。
The ground acceleration here must have been very high and the duration of the strong motion long to cause such incredible destruction.
当时地表加速度一定很高，而且强烈震动的时间很长，造成了如此严重的破坏。
Seismological models are generally used to enrich the existent sets of earthquake records with artificial ground acceleration time histories.
地震模型一般是应用人工地面加速度时间历程存在集来丰富地震记录。
The method proposed by Panza(1999)was used in the calculation to obtain the distribution map of the maximum ground motion and design ground acceleration(DGA).
计算获得了华北地区最大地面运动和设计地面加速度（DGA）的分布图。
Methods to determine the probability that certain ground acceleration levels will be experienced in a given site are referred to as "seismic risk" or "seismic hazard" analyses.
方法测定的概率，某些地面加速度水平将被体验在某一特定地点都被称为“地震风险”或“地震风险”分析。
The in-situ measurement includes:( 1 ) the ground acceleration due to horizontal vibrating force caused by the vibroflot and its variation with the distance from the vibrating center;
现场试验包括：①测定振冲器水平振动力作用下产生的地面加速度以及制桩时引起的地面加速度与距振点距离之间的关系；
Its power spectral model is the twice-filtered white noise model. Moreover, the relation between the power spectral intensity and the mean value of maximum ground acceleration is set up.
地震地面运动功率谱模型采用两次过滤白噪声模型，建立了地震地面运动谱强度与最大加速度均值之间的关系。
Peak ground acceleration, or shaking, caused by Friday's earthquake was nearly double—at its epicenter—than what the Fukushima Daiichi plant, 110 miles (172 km) away, was built to withstand.
星期五地震震中的峰值地面加速度或者振动接近距离震中110英里（172公里）的福岛第一核电站设计承受能力的2倍。
The effect of the depth of the soft strata on ground peak acceleration is analyzed, and some conclusions with realistic significance are drawn.
分析研究了不同埋深的软弱夹层对地表加速度峰值的影响，获得了一些有意义的结论。
The frequency response functions of relative displacement and absolute acceleration are derived under acting of harmonic ground excitation.
推导了地面简谐运动作用下的加速度和位移的频率响应函数。
PGA (peak acceleration) is what is experienced by a particle on the ground.
最大加速度(峰值加速度)是大地上的一颗粒子承受的加速度。
An actual number for front sag is less important, especially considering that more bikes come from the factory with extra front sag that helps keep the front tire on the ground under acceleration.
实际上前减震预载不是特别重要，特别是考虑到很多车从工厂出来时有一个额外的前减震下沉，以确保加速是前轮能紧贴地面。
For three kinds of different soil layer construction, the characters of the platform values and the characteristic periods of ground surface acceleration response spectra were studied.
系统地研究了软夹层在底部、中部和顶部的三种土层结构的反应谱平台值和特征周期的主要特征。
A continuous GPS network could easily detect this fitful acceleration, well before ground-shaking earthquakes began to occur and, with luck, in plenty of time for a useful tsunami warning.
持续监测的GPS接收网络，可以早在撼天动地之前，轻易侦测到这种不规则的加速作用，更幸运的话，还有足够的时间发出海啸警报。
The ground surface response spectrum of acceleration, velocity and displacement were calculated using NDFEPS-2D.
运用NDFEPS - 2d计算了若干场地模型的地面加速度反应谱、速度反应谱、位移反应谱。
The vibrating acceleration on the ground is strongest over the tunnel, and weakens gradually in the lateral directions. It is amplified at a certain distance away from tunnel central line.
地表振动加速度在隧道正上方强度最大，往两侧逐渐减弱，而在离开隧道轴线一定距离部位出现了一加强区。
Using the ground and vehicular test systems, many parameters such as pressure change, wind caused by train, micro-pressure wave and vibration acceleration of the wall of tunnel were tested.
利用地面和车载测试系统，对列车车体表面、车厢内部、隧道壁面空气压力变化、隧道内列车风、隧道口微气压波和隧道壁面振动加速度等参数进行测试。
So studying of the envelope function of the practical ground motion acceleration records is very important.
因此，研究实际地震动时程强度包络函数的特性，对合理模拟地震动时程具有重要的意义。
Then some rules are presented: the frequency characteristics, acceleration peak value of the input ground motion have great influence on the seismic response of composite foundation.
结果表明：输入地震动的强度和频谱特性对复合地基地震效应影响较大；
Then, the power spectral density (PSD) of the acceleration at ground level is evaluated by an iterative approach according to the principle of equivalent peak acceleration.
然后，根据加速度峰值等效原则，选代计算得到地面的加速度功率谱密度曲线；
The example shows that the ground has some amplifying action to seismic acceleration and the real seismic acceleration of the sole rock …
算例表明，地层对地震运动加速度有一定的放大作用，在地下结构抗震计算中应以实际基岩地震运动加速度作为地震动输入。
The example shows that the ground has some amplifying action to seismic acceleration and the real seismic acceleration of the sole rock …
算例表明，地层对地震运动加速度有一定的放大作用，在地下结构抗震计算中应以实际基岩地震运动加速度作为地震动输入。
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