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到目前为止,国内外对非刚性地基上的抗震计算都未能提出成熟的方法,现就国内外的震害资料,对非刚性地基上梁桥的抗震计算提出一些建议,供同志们参考。第一种方法,考虑非刚性地基上桥梁的抗震计算,是将非刚性地基的影响在设计烈度上提高一度,按刚性地基考虑各种桥梁的抗震计算问题,这种方法很简单,但也是一种不得已的方法,将设计烈度提高一度并不能充分反映非刚性地基的影响,因此这只是一种很粗略的估计方法。第二种方法,是将非刚性地基在地震时产生的作用分别考虑,然后按最不利的组合叠加。兹分述如下:
So far, no mature method has been proposed for the seismic calculation of non-rigid foundations both at home and abroad. Nowadays, some suggestions on seismic calculation of bridges on non-rigid foundations are put forward for domestic and overseas earthquake damage information for reference. The first method, which considers the seismic calculation of bridges on non-rigid foundations, is to increase the influence of non-rigid foundations on the design intensity by one degree and to consider the seismic calculation of various bridges on rigid foundations. This method is simple but also The last resort, which increases the intensity of the design once and does not adequately reflect the effects of non-rigid foundations, is only a rough estimate. The second is to consider the effects of non-rigid foundations on earthquakes separately and then superimpose them in the most unfavorable combination. Here are the points: