Comparison of the earthquake responses of super-high-rise building structures based on different seismic design spectra

Abstract EN

To evaluate the reliability of the long-period segments of seismic design spectra, two super-high-rise buildings with long-period vibration periods are analyzed.

The response spectrum method and dynamic time-history method are employed to investigate the maximum displacement of the building’s top and the maximum earthquake shear of the building’s base.

Based on the long-period segments stipulated in the Japanese and Chinese design codes, the displacement spectra increase significantly as the vibrational period increases, which is not consistent with the statistical attenuation characteristics.

The maximum earthquake shear force calculated in accordance with the response spectrum method in the proposed design spectrum is consistent with the average results calculated by the dynamic time-history method as well as with the results calculated according to the Chinese design spectrum and the design spectrum utilized in the US.

However, the proposed design spectrum better characterizes the shear response of the long-period building with high-order modes.

For large long-period buildings, the maximum displacement calculated in accordance with the Chinese design spectrum increases with the damping ratio.

The variation of the maximum shear force of the building’s base is very small.

This indicates that the long-period segment in the Chinese design spectrum is not reasonable.

For large long-period buildings, the increasing ratio of the damping force to the structural system’s internal force as the damping ratio increases cannot be ignored.

Therefore, the reduction ratio of the damping force in the long-period segments of the response spectrum should be appropriately selected.