| 1. | 4 . the ground surface response spectrum of acceleration 、 velocity and displacement were calculated using ndfeps - 2d
4 、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。 |
| 2. | The goal of this paper is to develop the long period attenuation relationships for horizontal acceleration response spectrum of rock site in china
本文建立了我国水平向基岩长周期加速度反应谱衰减关系。 |
| 3. | And the effects of liquefaction sand soil on surface ground motion are investigated for considering the thickness 、 depth 、 width of the liquefied sand layer and the input earthquake wave
主要分析了饱和液化层厚度、饱和液化层埋深、土性参数和输入地震波等因素对地面加速度反应谱的影响。 |
| 4. | Then the transform method and the digital broad - band data from china is applied to obtain the wide period attenuation relationships for horizontal acceleration response spectra of eastern china and western china in rock sites ( c , = 5 % )
最后用常规的转换方法，并加入我国158条水平向宽频带数字记录，建立了中国东部和西部地区的水平向基岩宽周期( t = 0 . 04 - 20s ， = 5 )加速度反应谱衰减关系。 |
| 5. | This paper relates to some problems about the determination of design ground motion parameters , which include the choice of the attenuation relationship of rock horizontal acceleration response spectrum , the impact of focal depth to rock peak horizontal acceleration and rock response spectrum curves , the choice of intensity envelops function and random input phase , the choice of soil nonlinearity and shear wave velocity , scale of design ground motion response spectrum etc . in the researches of relative aspect , based on a typical section plane of the engineering site , influence of the change of some parameters on design ground motion parameters and the existing errors and corresponding rules are studied by using the method of one dimension model of equivalent linearization
摘要研究了确定设计地震动参数中涉及的若干问题，其中包括基岩水平加速度反应谱衰减关系的选择、震源深度对基岩水平加速度峰值及基岩反应谱曲线的影响、强度包络线函数及输入随机相位的选择、土体非线性特性参数和土层剪切波速值的选择、设计地震动反应谱的标定等问题。 |
| 6. | B ) relative velocity response spectrum ( sv ) and relative displacement response spectrum ( sd ) : the variation of velocity spectrum with depth is similar to that of acceleration spectrum . but the variation of displacement spectrum with depth is a little different to that of acceleration and velocity spectrum . that is , in strong earthquake , the variation of displacement spectrum and normalized spectrum in different depth is very small
( 2 )速度反应谱( s 、 )和位移反应谱( sd )沿深度变化的规律速度反应谱沿深度变化的特点与加速度反应谱基本相似;位移反应谱沿深度变化的特点与加速度和速度反应谱有较小差别，即强震时位移反应谱和标准位移反应谱沿深度的变化很小。 |
| 7. | In this part , response spectrum and fourier amplitude spectrum are studied , the main results are as follows : 1 ) response spectrum analysis : a ) absolute acceleration response spectrum ( sa ) : ( 1 ) in general , response spectrum decrease with depth , for m < 4 . 5 , the shape and the predominant period of each response spectrum in different depths are similar : the variation of spectra with depth focus on near - surface level ; the normalized spectra are similar to each other , except the predominant perk value in middle depth of some earthquakes is higher than other depth
地震动反应谱沿深度变化的规律( l )加速度反应谱( s 、 )沿深度的变化规律一般，加速度反应谱( s 。 )随深度的增加而减小。震级较小时，不同深度各测点的反应谱形状很相似，卓越周期基本一致;浅层处反应谱沿深度的变化梯度较大;深层处反应谱大小比较接近;强震时，反应谱形状在短周期有较小差别，长周期逐渐接近。 |
| 8. | The long period attenuation relationship of acceleration response spectrum is developed using this database . the short - period attenuation equation is developed by using the analog strong motion records of western north america . by connecting the short period and the long period attenuation relationships together , the wide period ( 7 " = 0 . 04 - 20sec ) attenuation relationships for horizontal acceleration response spectrum of western north america are obtained
与用模拟式强震仪记录所得出的美国西部地区短周期( t = 0 . 04s - 4s )加速度反应谱衰减关系结合，得出了美国西部地区水平向基岩宽周期( t = 0 . 04 - 20s )加速度反应谱衰减关系。 |
| 9. | With the use of one - dimension equivalent - linear wave motion method which is wildly used at present in the analysis of earthquake site response , the platform values and the characteristic periods of ground surface acceleration response spectra of different profiles were calculated and analyzed under different ground motion inputs
利用目前工程上常用的一维等效线性化波动方法计算分析在不同地震动输入下，不同场地类别、三种土层结构的地表加速度反应谱的特征周期和平台值。 |
| 10. | A modified two - dimensional dynamic effective stress method is established and also the corresponding program presented in the paper . and the method is used for analyzing the effects of liquefaction of sand soil zone on surface ground motion and the response spectrum of acceleration 、 velocity and displacement
本文在现有研究的基础上,建立了一种土体二维有效应力动力分析方法并编制了相应程序,并以此计算分析了饱和液化砂层对地表加速度反应谱、速度反应谱、位移反应谱的影响。 |
