M. Alirezaei - Ph.D student International Institute of Earthquake Engineering and Seismology , Tehran, Iran
H. Shakib - Faculty Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran

The rotational component of seismic strong-motion is attracting attention since it is becoming evident that it may contribute considerably to the overall response of structures to earthquake motions. This paper presents an improved method for calculating the time histories of torsional and rocking components of ground motion corresponding to a set of three recorded orthogonal translational components. Using the multicomponent input, the maximum structural response to an arbitrarily oriented earthquake is derived. The mathematical model and numerical results of the torsion and rocking obtained from a set of three recorded translational components are also presented

Rotational components of earthquake; Near-fault; Far fault