现有的一些规范对于确切地评价桥梁的抗震性能在很多方面存在着缺点。Ⅱ-A.12-69关于地震对建筑物的作用作了一般评述,但是对各别类型建筑物(如对桥墩)的计算方法未作具体阐明。其实,经验表明,桥墩大多都是由于作用在顺桥向的振动而遭受破坏的。在计算桥梁的地震作用时,系将桥墩视为悬臂杆件,并把活载的质量与桥跨结构作为刚性联接来考虑。这种方法不能反映出“桥梁一 Some existing specifications have some shortcomings in many aspects for evaluating the seismic performance of bridges. Ⅱ-A.12-69 General comments on the role of earthquakes in buildings, but no specific clarification of the method of calculation for each type of building (eg piers). In fact, experience shows that most of the piers are damaged due to the vibration of the bridge along the bridge. In calculating the seismic effect of bridges, the bridge piers are considered as cantilever members, and the mass of live load and bridge span structure are considered as rigid joints. This method can not reflect the "bridge one