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(一)关于地震加速度谱曲线的问题原文利用比阿(Biot)式的扭摆计算的三条地震加速度谱曲线,具有下列特征: 1.谱曲线具有随双曲线变化的倾向; 2.谱曲线的峯点出现在0.2至0.5秒之间。这与现行各国规范及已往文献所采用的加速度谱曲线的形式是基本一致的。我们曾把地震时地面的运动(加速度)近似地当作平稳随机函数对结构的反应进行过研究,所得的加速度措曲线也具有上述特征。但是值得着重指出,当T>1.5秒时,加速度谱曲线并不是一条水平线,而是以横座标T釉为渐近张的曲张,并可近似用下式表示:
(I) Questions on seismic acceleration spectrum curves Three seismic acceleration spectrum curves calculated using the Biot-type torsion pendulum have the following characteristics: 1. The spectral curve has a tendency to change with the hyperbola; 2. The peak of the spectral curve Points appear between 0.2 and 0.5 seconds. This is basically consistent with the form of the acceleration spectrum curve adopted by the current national norms and the previous literature. We have studied the ground motion (acceleration) as an approximation of the stationary random function response to the structure during an earthquake. The resulting acceleration curve also has the above characteristics. However, it is worthwhile to point out that when T>1.5 seconds, the acceleration spectrum curve is not a horizontal line, but is an asymptotic sheet with the T-axis glaze, and can be approximated by the following formula: