Dominant pulse simulation of near fault ground motions
In this study, a new mathematical model is developed composed of two parts, including harmonic and polynomial expressions for simulating the dominant velocity pulse of near fault ground motions. Based on a proposed velocity function, the corresponding expressions for the ground acceleration and displacement time histories are also derived. The proposed model is then fitted using some selected pulse-like near fault ground motions in the Next Generation Attenuation (NGA) project library. The new model is not only simple in form but also simulates the long-period portion of actual velocity near fault records with a high level of precision. It is shown that the proposed model-based elastic response spectra are compatible with the near fault records in the neighborhood of the prevailing frequency of the pulse. The results indicate that the proposed model adequately simulates the components of the time histories. Finally, the energy of the proposed pulse was compared with the energy of the actual record to confirm the compatibility.
Keywordsdominant pulse near fault ground motions forward directivity response spectra simulation
Unable to display preview. Download preview PDF.
- Abrahamson NA (2000), “Effects of Rupture Directivity in Probabilistic Seismic Hazard Analysis,” Proceedings of the 6th International Conf. on Seismic Zonation, Earthquake Engineering Research Institute, Palm Springs.Google Scholar
- Alavi P and Krawinkler H (2001), “Effects of Nearfault Ground Motion on Building Structures,” CUREEKajima Joint Research Program Report, Richmond, California.Google Scholar
- Anderson JC, Bertero VV and Bertero RD (1999), “Performance Improvement of Long Period Building Structures Subjected to Severe Pulse-type Ground Motions,” PEER Report 1999/09, University of California at Berkeley, California.Google Scholar
- Baker J (2008), “Identification of Near-fault Velocity Pulses and Prediction of Resulting Response Spectra,” Proceedings of the Geotechnical Earthquake Engineering and Structural Dynamics IV, Sacramento, CA.Google Scholar
- Chopra AK and Chintanapakdee C (1998), “Accuracy of Response Spectrum Estimates of Structural Response to Near-field Earthquake Ground Motions: Preliminary Results,” Proceedings of the Structural Engineers World Congress, San Francisco, California.Google Scholar
- Fu Q and Menun Ch (2004), “Seismic Environment Based Simulation of Near Fault Ground Motion,” Proceedings of the 13th World Conference on Earthquake Engineering, Vancouver, B.C., Canada.Google Scholar
- Kasalanati A and Constantinou MC (1999), “Experimental Study of Bridge Elastomeric and other Isolation and Energy Dissipation Systems with Emphasis on Uplift Prevention and High Velocity Nearsource Seismic Excitation,” Technical Report MCEER-99-0004, University at Buffalo, State University of New York, Buffalo, NY.Google Scholar
- Mylonakis G and Reinhorn AM (2001), “Yielding Oscillator under Triangular Ground Acceleration Pulse,” J. Earthquake Eng., 5: 225–251.Google Scholar
- Sasani M and Bertero VV (2000), “Importance of Severe Pulse-type Ground Motions in Performancebased Engineering: Historical and Critical Review,” Proceedings of the Twelfth World Conf. on Earthquake Engineering (12WCEE), Auckland, New Zealand.Google Scholar