【摘要】 人们经常在数值积分中,对所选取的某一地震记录的主要周期不满而采用人为改变时间坐标的办法。然而,作者的计算分析表明,这种人为改变坐标的同时,也改变了会对在地震作用下结构的弹塑性反应产生主要影响的功率谱,使计算的结构反应产生预想不到的结果,有时还会使结构设计偏于不安全。因此,在弹塑性反应中,最好不要再采用这种方法。更多还原

【Abstract】 Some pepole often change the time coordinate of seismic accelerogram in the numerical integration method,so as to get the record with more suitable predominent period. However, the analysis in this paper shows that because of this change the power spectral density function changes as well, which is the most important factor to bring the effect on elasto-plastic structural response. The calculation results may become unpredictable and lead to a unsafe design sometimes.In the view of the author, it is better not to use this method.更多还原