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震动     
相关语句
  motion
    Finite Fault Source Model for Predicting Near-field Strong Ground Motion
    近场强地震动预测的有限断层震源模型
短句来源
    The Effect Factors and Uncertainty Analysis of Ground Motion Characteristic
    地震动特性的影响因素与不确定性分析
短句来源
    RANDOM SIMULATION AND ITS PARAMETER DETERMINATION METHOD OF EARTHQUAKE GROUND MOTION
    地震动随机模拟及其参数确定方法
短句来源
    STUDY ON RANDOM FLUCTUATION CHARACTERISTICS OF AMPLITUDE SPECTRA OF STRONG GROUND MOTION
    强地震动幅值谱随机涨落特征的研究
短句来源
    Application of Ground Motion Duration to Seismic Design
    地震动持续时间在抗震设计中的应用
短句来源
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  shock
    RELATIONSHIP OF THE SITE INDEX WITH THE SEISMIC SHOCK PARAMETERS
    场地指数与地震动参数的关系
短句来源
    Then the relationship of the site index with the seismic shock Parameters (maximum ground acceleration and characteristic period of response spetra) is researched, thus the efficiency of the site index for showing site effect in earthquake is tested.
    研究了地震动参数(地面加速度和反应谱特征周期)与场地指数的关系,验证了场地指数反映场地地运效应的有效性。
短句来源
    The result shows that the ground shock with 5% exceedance probabi lity in 50 years will be a distant event,and that with 2% in 100 years will be a near one.
    10 0年超越概率 2 %的地震动为近震影响。
短句来源
    After strong earthquakes occurrecd from 1966 to 1976, the methodologies and procedures of SHA and microzonation were improved rapidly, the understandings on the effect of local site condition on strong ground motion and on the site failure during the shock were developed in depth.
    1966—1976年的一系列强烈地震发生后,SHA和地震小区划的方法有了迅速改进,更深刻地认识了局部场地条件对地震中强地震动和场地失效的影响。
短句来源
    Most of bunch through downtown of Yanji city, due to limitation of city installations, can not excitation with bulk charge, and shock of seismic source easy to produce resonance with surrounding buildings, there are serious damages.
    大部分线束在延吉市区穿过,受城市设施的限制,不能使用大药量激发,震源的震动极易于周围建筑物产生谐振,危害较大。
短句来源
  shake
    The selection of the blasting-earthquake intensity project standard parameters, the ground vibrations induced by blasting, and analysis of the shake force against structure are the predominate questions of project structure.
    爆破地震震动达到足够强度时,就会引起各种破坏现象。 寻找爆破地震烈度工程标准参数,研究爆破地震动强度,分析爆破地震力对结构的破坏作用,是当前工程结构抗爆破地震效应研究的重点问题。
短句来源
    We well predicted the seismic vibration at the experimental site of Turkey flat by the propagation-matrix method and the corresponding computer software was developed by us,The results of the blind test show that parameters of geology model are very important for the prediction of the response of surface seismic shake.
    盲测结果表明,表面地质模型参数对于正确的预测地表的地震动响应是十分重要的。
短句来源
  quake
    By analysis of the quake harm for Shanghai and its neighborhood area, combining the results in Shanghai area earthquake researth, according to the real requirements of the cultural relics protection from quake for Shanghai Museum, the fortify level and the motion parameters of the cultural relics protection from quake for museum have been studied and determined.
    通过对上海及邻近地区地震危害性分析,结合地震研究工作结果,根据上海博物馆文物防震保护的具体要求,研究确定了该博物馆文物防震保护的设防水准及地震动参数。
短句来源
    These artificial quake wave histories have the same statistical characteristics, along with one real motion time history in the Shanghai architecture anti ~ seismic code (DGJ08 - 9 - 92) , as the input motion of the structural quake response analysis for Shanghai Museum building.
    同时结合上海市《建筑抗震设计规范》(DGJ08-9-92)中所附的一条强震记录,共同作为上海博物馆结构地震反应分析的输入地震动
短句来源

 

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      motion
    Equivalently, no matter where it starts, Brownian motion on M never explodes.
          
    Wavelets, generalized white noise and fractional integration: The synthesis of fractional Brownian motion
          
    We provide an almost sure convergent expansion of fractional Brownian motion in wavelets which decorrelates the high frequencies.
          
    Our approach generalizes Lévy's midpoint displacement technique which is used to generate Brownian motion.
          
    The low-frequency terms in the expansion involve an independent fractional Brownian motion evaluated at discrete times or, alternatively, partial sums of a stationary fractional ARIMA time series.
          
    更多          
      shock
    Their relations to other classes of life distributions, closure properties under the three reliability operations, and inheritance properties under shock models and Laplace-Stieltjes transforms are discussed.
          
    A system receives shocks at successive random points of discrete time, and each shock causes a positive integer-valued random amount of damage which accumulates on the system one after another.
          
    As supersonic speed at upper reaches and subsonic speed at lower reaches in a duct, the position of shock layer is analyzed and the asymptotic estimation of solution, is obtained.
          
    With modulus m → 1 or m → 0, these solutions degenerate into corresponding solitary wave solutions, shock wave solutions and trigonometric function solutions.
          
    Polymerase chain reaction was used to amplify a 439-bp fragment of a 65,000-kDa (Mr) heat shock protein gene (hsp65) of Mycobacterium.
          
    更多          
      shake
    An endophyte (designated ZP5SE) was isolated from the seed of Nothapodytes foetida and was examined as a potential source of anticancer drug lead compound, i.e., camptothecin, when grown in Sabouraud liquid culture media under shake flask conditions.
          
    The second one is associated with the "shake-up" effect caused by the modulation of the atomic ground-state Lamb shift upon a fast change in the cavity parameters.
          
    In addition, a new mechanism of photon generation associated with the shake-up effect appears.
          
    The theoretical integrated intensities of the shake-off and shake-up satellites ("with a spectator") in the L2, 3 Auger spectra of argon-like molecules make up 8.2-10.4% of the total Auger spectrum intensity.
          
    The relative role of shake-up and shake-off processes in additional monopole excitation of L and M electrons due to inner atomic
          
    更多          
      quake
    A synthesis of the findings from the Quake Impact Study: a two-year investigation of the psychosocial sequelae of the 1989 Newca
          
    This paper summarises the major findings from the Quake Impact Study (QIS), a four-phase longitudinal project that was conducted in the aftermath of the 1989 Newcastle (Australia) earthquake.
          
    Three groups were examined according to their distance from the epicenter of the quake.
          
    The Bone and Joint Hospital in Kashmir found itself in a relatively unique situation of having to deal with the orthopedic morbidity generated by this quake.
          
    Based on the principle of Tuned Mass Damper (TMD), the test of a new quake-reduction system was investigated.
          
    更多          


    The authors divide the effect of the shape of a valley cross-section on the earthquake hydrodynamic pressures into two parts: one due to the solidity ratio s=A/Bh, or the cross-sectional area A divided by the free-surface width B and the depth h, and the other due to the width-depth ratio w=B/H. As the ordinary cross-sections of valleys are essentially symmetric, three basic shapes, namely, rectangle, semi-circle, and isosceles right triangle, are chosen for analysis. Earthquakes in both the longitudinal and...

    The authors divide the effect of the shape of a valley cross-section on the earthquake hydrodynamic pressures into two parts: one due to the solidity ratio s=A/Bh, or the cross-sectional area A divided by the free-surface width B and the depth h, and the other due to the width-depth ratio w=B/H. As the ordinary cross-sections of valleys are essentially symmetric, three basic shapes, namely, rectangle, semi-circle, and isosceles right triangle, are chosen for analysis. Earthquakes in both the longitudinal and the laterally transverse direction with respect to the valley axis are treated. The fundamental equations and hypotheses used follow those of Westergaard and Werner, and also borrowed from the two authors are the expressions for pressures on rectangular and semicircular dam surfaces due to longitudinal earthquake. Equation (8) gives a definition of the wave number c per unit length as related to the density ρand the bulk elastic modulus K of the water, the velocity ν_s, of sound in the water, and the circular frequency ω and the period T of the assumed simple harmonic seismic waves. In Eqs. (9) and (10) are introduced for the pressures and moments on dam surfaces the pressure coefficient C_p, the total pressure coefficient C_p, the coefficient of moment about the water line C_(MZ) due to longitudinal earthquake; and the corres ponding C'_p, C'_p, and C'_(MZ) and the coefficient of moment about the center line C'_MY due to transverse earthquake. In these equations, the symbol α denotes the acceleration coefficient; γ, the specific weight of water; A'=A/2, half the symmetric area; and b=B/2, the half width. Equations (11a) to (11c) and (12a) to (12d) are the derived expressions of the various coefficients for rectangular surface; Eqs. (13a) to (13c) and (14a) to (14d) are the ones for semi-circular surface, with the reduced Eqs. (14'a) to (14'd) in the condition c=0; and Eqs. (15a) to (15c) and (16a) to (16c), and also the reduced Eqs. (16'a) to (16'c) for c=0, are for isosceles right triangular surface. Figure 2 shows the effect of s on the conditions of resonances, for which the upper and the lower two curves correspond respectively to the case of transverse and longitudinal earthquake. Here the units of h and T refer respectively to meter and second.In Fig. 5 is shown the effect of s on the magnitudes of the various pressure and moment coefficients when the compressibility of water is ignored. Although this figure is for ω=2, it is considered that C_p and C_(MZ) for longitudinal earthquake depend on s only,and Fig. 5 alone is sufficient for their estimation whatever be the value w. Figure 6 shows the effect of ω on the various coefficients for transverse earthquakes when c=0 and s=1. Because C' is influenced by both s and w, it is suggested that when a C' is to be estimated, it is first obtained from Fig. 5 for the given s and then multiplied by the corresponding one obtained from Fig. 6 for the given w and again divided by C' for ω=2 from Fig. 6.

    本文研究了河谷断面形式对铅直坝面上地震动水压力的影响。断面形式包括矩形、半圆形和二等边直角三角形,地震方向包括沿河谷的纵向和垂直于河谷的横向。给出了相应的压力分布、总压力和力矩的表示式,并进行了计算。引入了河谷断面充实比数和宽深比数来作为河谷断面形式的代表,并绘出了总压力和力矩系数随此二比数变化的曲线组,以供设计参考。

    An earthquake ground motion time history is a function of its Fourier amplitude and Fourier phase spectrum. For a given Fourier amplitude spectrum, different phase spectrum can produce widely different time histories. For the purpose of simulating design earthquake ground motions which have the properties of non -stationarity of real accelerations in both amplitude and frequency contents,it is very fundamental to make clear the mechanism about how amplitude spectrum and phase spectrum affect the non -stationarity...

    An earthquake ground motion time history is a function of its Fourier amplitude and Fourier phase spectrum. For a given Fourier amplitude spectrum, different phase spectrum can produce widely different time histories. For the purpose of simulating design earthquake ground motions which have the properties of non -stationarity of real accelerations in both amplitude and frequency contents,it is very fundamental to make clear the mechanism about how amplitude spectrum and phase spectrum affect the non -stationarity of time history because the influence of non -stationarity on the dynamic response of structures, especially nonlinear structures, can not be neglected. In recent years, the significance of phase differences spectrum in certain properties of envelope functions of earthquake ground motions has been emphasized. In this paper,the relationship between the non - stationarity of earthquake ground motion in both amplitude and frequency contents and the factors such as amplitude spectrum and phase differences spectrum is deduced by means of modeling earthquake ground accelerations as a non - stationary random process and regarding a time history as the addition of a series of narrow band components containing a certain frequency of Fourier spectra. Special attention is paid to the mechanism that the mean value and variance of phase differences spectrum cause the non -stationarity in amplitude and frequency contents of earthquake ground motions. The results indicate that when the mean value of phase differences spectrum approximates constant,the time history is stationary in frequency contents. At this time,amplitude spectrum and phase differences spectrum affect the intensity function of time history independently. Phase differences spectrum is decisive to the shape of intensity function and the influence of amplitude spectrum is negligible. On the other hand,if the mean value of phase differences spectrum is dependent on frequency,the time history will be non -stationary in frequency contents and the influence of amplitude spectrum and phase differences spectrum on the non - stationarity can not be separated, which means both of them affect the shape of intensity function.

    本文将地震动时程视为非平稳的随机过程,通过将其分解为一系列窄频带波包的方法,讨论了地震动强度及频率非平稳性与幅值谱和相位差谱的关系,并着重分析了相位差谱及其均值和方差对地震动非平稳性作用的机制。

    An inhomogeneous fault model of the Tangshan earthquake is developed in this paper. A series of synthetic seismograms of the event are calculated by using the RTDW (Generalized Reflection -Transmission Coefficient Matrix in Discrete Wavenumber) method in consideration of the local site conditions. Moreover,by comparing with real seismic damage during the earthquake and other numerical results,the rationality of the results obtained in the paper is discussed.

    本文建立了非均匀的唐山主震断层模型,利用广义反射-透射系数矩阵和离散波数方法,考虑局部场地效应,给出了唐山、迁安、宁河、玉田、天津、北京等地地震动时间过程的数值模拟结果。文章通过比较分析并结合唐山地震震害特点论述了数值模拟结果的合理性。

     
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