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