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开展了北京地区波速测试误差专项实验,并研究了其对PGA的影响,得到了如下结论:北京地区波速测试误差符合标准正态分布,场地整体的测试误差保持在同一水平,误差标准差可以定为12%;北京地区波速测试误差略小于全国的平均水平,其中II类场地的测试精度较高,误差较小,III类场地的测试误差基本持平;误差越大对PGA影响越显著,定性计算工况中,0.5倍标准差的测试误差引起的PGA变化均小于20%,某些工况下,1倍标准差的测试误差可能引起PGA变化超过50%,2倍标准差的测试误差可能引起PGA变化率超过70%;输入波的频率成分与场地固有频率相近时,PGA所受影响更加明显。
The special test of wave speed test error in Beijing area was carried out and its influence on PGA was studied. The following conclusions were obtained: The error of wave speed test in Beijing meets the standard normal distribution, the test error of the whole site remains at the same level, and the error standard deviation can be set Is 12%; Beijing area wave speed test error slightly less than the national average, of which Class II site test accuracy is higher, the error is small, the type III site test error is basically the same; more error greater impact on the PGA, qualitative calculation In the working condition, the variation of PGA caused by the test error of 0.5 times the standard deviation is less than 20%. In some conditions, the test error of 1 times the standard deviation may cause the change of PGA to exceed 50%, and the test error of 2 times of standard deviation may cause PGA rate of change of more than 70%; input wave frequency components and the natural frequency of the site is similar, the impact of PGA more obvious.