Understanding Effects of Evolutionary Arias Intensity on Nonlinear Behavior of Hysteretic Systems and Liquefiable Grounds

ABSTRACT

The effects of evolutionary Arias intensity are thoroughly investigated based on ground motion simulation and nonlinear dynamic response. A new methodology is developed to generate a series of spectral-equivalent synthetic motions with different energy accumulation paths using wavelet packets. Systematic studies are performed on dynamic responses of hysteretic systems and liquefiable grounds using the simulated motions and actual recordings. An attempt is made to develop the relationship between liquefaction-induced deformation and shaking intensity rate which is used to quantify the rate of Arias intensity accumulation. The results indicate the need of considering evolutionary Arias intensity in nonlinear dynamic analysis.

KEYWORDS:

• Stochastic ground motion simulation
• nonlinear dynamic analysis
• energy accumulation process
• SDOF systems
• soil liquefaction

Acknowledgments

The work was supported by the National Key R&D Program of China (Grant No. 2023YFC3081500) and the National Natural Science Foundation of China (Grant No. 52179134 and 52192672), which are gratefully acknowledged.

Disclosure Statement

No potential conflict of interest was reported by the author(s).

Data and Resources

The ground motion recordings used in this study were obtained from the PEER ground motion database, i.e. https://ngawest2.berkeley.edu/.

Additional information

Funding

The work was supported by the National Key R&D Program of China (Grant No. 2023YFC3081500) and the National Natural Science Foundation of China (Grant No. 52179134 and 52192672).