Before revision: 99 (2009) 1483-1485. which the main reasons of this ignorance may be attributed to: (1) lack of the sufficient recorded data on the rotational accelerations; (2) difficulty in presenting a quantitative assessment of the rotational acceleration components for given translational components; (3) complexity in derivation of simplified seismic loading patterns for structures subjected to rotational excitations .
After revision: 99 (2009) 1483-1485 which the main reasons of this ignorance may be attributed to: (1) lack of the sufficient recorded data on the rotational accelerations; (2) difficulty in presenting a quantitative assessment of the rotational acceleration components for given translational components; (3) complexity in derivation of simplified seismic loading patterns for structures subjected to rotational excitations .