A comparative study of “missing mass” correction methods for response spectrum method of seismic analysis

The techniques that have been developed to account for the effect of “missing mass” contained in the uncalculated high frequency modes for the response spectrum method of seismic analysis, viz, static correction method, mode acceleration method and residual mode method are reviewed in detail. The rationale for using these methods is examined and the merits and demerits are discussed. The methods are compared, with the help of numerical examples by evaluating the response of structures for El Centro (1940) earthquake. “Missing mass” correction using residual mode method is found to be superior to other methods for the seismic analysis of structures using response spectrum method.