Abstract
To provide an important reference for the energy-based seismic design of long-period structures, the elastoplastic dynamic analysis program is employed to study the seismic energy response of single-degree-of-freedom (SDOF) systems under two types of typical long-period ground motions. Then, the influencing relationships of external and internal factors on the energy response spectra under near-fault pulse-like and far-field harmonic ground motions are analyzed one by one. Study results are obtained as follows: within the whole period, all the input energy, hysteretic energy and damping energy spectra of SDOF systems under near-fault pulse-like and far-field harmonic ground motions, are larger than those under common ground motions, even the seismic energy response under far-field harmonic ground motions is larger than that under near-fault pulse-like ground motions. From the aspect of energy concept, the energy response spectra and energy distribution rule of SDOF systems are evaluated based on the intensity and spectral distribution under near-fault pulse-like and far-field harmonic ground motions. If the ratio of hysteretic energy to input energy (RHEIE) is determined, the hysteretic energy which must be dissipated by a structure would be derived by the method of energy-based design. The input energy and hysteretic energy are mainly influenced by damping ratio and ductility coefficient, while the yield stiffness ratio exerts minor effects. It indicates that reasonable structural design parameters would contribute to the hysteretic energy of a structure itself.
Highlights
It has been found that there are long-period components with the extensive study on the characteristic of earthquake records [1,2,3]
The dynamic behavior of high-rise buildings under various longperiod ground motions should be taken into account on the seismic design of the structure. e analytical results on test specimen subjected to long-period ground motions show that the cumulative ductility is four times greater than the design value, while the maximum story drift is almost the same as the design value [4]. e base-isolated high-rise buildings with long vibration period are in resonance with long-period components of earthquake records in Japan. e seismic design on these tall buildings with long vibration periods must be taken seriously [5]
For elastoplastic SDOF systems, the energy dissipation capacity of a structure mainly depends on the cumulative hysteretic energy of EH and damping energy of ED, and the hysteretic energy of EH accounts for a larger proportion
Summary
It has been found that there are long-period components with the extensive study on the characteristic of earthquake records [1,2,3]. Chen et al [23] thought that the seismic input energy of TOM wave is mainly distributed from 4 s to 10 s, and it is so easy to cause resonance effect on the prototype structures whose vibration period is about 9 s To this end, the seismic energy response to the long-period structures under long-period ground motions has attracted great attention in academia. Taking reliable long-period earthquake records as the research object, the elastoplastic dynamic analysis program is employed to study the seismic energy response of SDOF systems under two types of typical long-period ground motions. En, the external and internal factors affecting the energy response spectra and energy distribution rule are analyzed one by one It can provide an important reference for the energy-based seismic design of long-period structures subjected to long-period ground motions. For elastoplastic SDOF systems, the energy dissipation capacity of a structure mainly depends on the cumulative hysteretic energy of EH and damping energy of ED, and the hysteretic energy of EH accounts for a larger proportion
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