If r.m.s. (root-mean-square) of random seismic ground motions are equal,seismic responses are considerably greater for the case of soft soil than for the cases of firm soil or medium soil.

• 在加速度均方根相同的随机地震作用下；斜拉桥在软场地条件下的地震响应明显大于在硬场地条件下的响应；中等场地条件下的地震响应介于两者之间.