Abstract: Active fly ash concrete(RPC), is a new kind of activity in the future, high\|performance materials bridge engineering, there will be good economic and use value. This study uses “Midas” software modeling analysis in Xiping railway bridge in the omo valley poses the design and application of coal ash concrete compared the RPC concrete hollow thin\|wall piers and traditional pier stiffness, strength, especially in the construction, a systematic analysis of structural mechanics data pier. Discusses the RPC concrete hollow thin-wall piers in railway bridge in the application of the stiffness, puts forward the reasonable design scheme and technical measures.  

Key words: active fly ash concrete, hollow thin\, wall piers, stiffness