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现有日本桥梁设计规范中,计算抗震承载力时仅考虑了一维地震作用。然而,实际地震作用是三维的。介绍了三维地震作用下高架桥墩钢箱柱的一系列数值分析结果。选用2004年Chuetsu地震中的2条主地震波和1条最强余震波。结果表明:在主地震波作用下,考虑二维或三维地震作用时柱产生的变形要远大于一维地震作用。而余震波作用下,由于地震波频率较高,故仅考虑一维地震作用时柱产生的变形更大。
In the existing Japanese bridge design code, only one-dimensional seismic action is taken into account when calculating the seismic capacity. However, the actual seismic effect is three-dimensional. A series of numerical analysis results of steel box columns of viaduct pier under three-dimensional earthquake are introduced. Two major seismic waves and one strongest aftershock wave in the 2004 Chuetsu earthquake were selected. The results show that under the action of principal seismic waves, the deformation caused by the column when considering two-dimensional or three-dimensional seismic action is much larger than that of one-dimensional seismic. However, under the action of aftershock wave, due to the high frequency of seismic waves, the deformation caused by the column when the one-dimensional seismic action is considered is larger.