【摘要】 随机数是人工合成基岩地震动输入的必备参数,对地表地震动参数有一定影响。以某实际化工工程场地剖面及其基岩加速度反应谱为基础,调整随机数,人工合成不同的基岩加速度时程,以此为输入,计算场地地表地震动参数,并对比不同随机数下地表加速度反应。对比结果表明,相同的场地和基岩反应谱输入,不同随机数对应得到的地表反应谱高频部分(<0.2s)影响显著,而对地表反应谱周期部分(>0.2s)影响不大,其中峰值加速度差别最为显著,输入地震动强度越大差别越大,大震输入下可达到60gal,有可能影响烈度判断结果。基岩人造地震动随机数主要影响峰值加速度和地表反应谱高频部分,基本不影响反应谱长周期部分。更多还原

【Abstract】 Random number is a necessary parameter for artificial ground motion of the bed rock,it had a certain effect on the ground motion parameters. Base on a site profile and the acceleration response spectra of the bed rock which were chosen from a real engineering,different acceleration time histories were synthesized artificially using different random numbers,then the ground motion parameters were calculated of the site profile. After comparing the calculated parameters,some difference could be found as follows:( 1) the ground response spectra were not the same under the input acceleration wave synthesized according to same input response spectra but different random numbers,( 2) the difference was clear at high frequency parts( 0- 0. 2s) of the ground response spectra,especially for the peak ground acceleration,the main parts( > 0. 2s) of the ground response spectra were nearer.( 3)the difference became larger with the input motion intensity increasing,it could reach 60 gal for high level input motion,and it maybe lead to different judging results of seismic intensity. Random number mainly influences the peak ground accelerations but the main part of the spectra.更多还原