Stability evaluation of the acceleration and energy response spectra

摘要

Seismic design codes commonly use the acceleration response spectrum to determine the seismic force. It is based on the maximum elastic response at a specific time according to the equation of motion for a single-degree of -freedom system. The seismic effect is evaluated as the load effect by the response spectrum. However, there is no close correlation between the seismic input energy and acceleration response spectrum. Structural damage is not necessarily proportional to the maximum response of acceleration/displacement and is also significantly affected by the accumulative inelastic deformation during an earthquake. In addition, real structures have multiple stories with various distributions of the strength, stiffness and mass alongside P-Delta and torsional effects, so the current acceleration spectrum is very different from real behavior. In this study, the stability of the acceleration response spectrum according to structural characteristics mentioned above was verified by numerical analysis and compared to the stability of the energy response spectrum. The adequacy of the current design spectrum was evaluated to develop suggestions for improving the accuracy of seismic design for the ground motions with the predominant period of less than 1.00 s.