I recently downloaded a few near-fault fling step ground motions, from the PEER database. I plotted the displacement time history of each record contained in the downloaded PEER data, as well as the double integrated displacement data using SAP 2000 software. But the displacement data do not show the fling step characteristics such as permanent displacements from the mean position. The same problem is observed for all the records, some of which are the Chi-Chi earthquake, Station TCU 129, TCU 049. Please clarify what could be the probable reason why this happens? I have attached the displacement time history of ground motion Chi-Chi, Station TCU 049, as downloaded from PEER Database.
I would recommend to start with checking whether the time series you downloaded are "corrected" (which generally includes a high-pass-filtering) or "uncorrected". In the former case, the residual final displacement cannot be properly retrieved.
Thankyou Sir. Also, Burks and Baker has reported the following in their work 'A predictive model for fling-step in near-fault ground motions based on recordings and simulations' . "All ground motions (other than Landers earthquake ) are processed in a way that removes static displacements (and some databases contain un processed versions of ground motions as well). These databases are thus not very useful for engineers who want to include fling in their analysis. Also, any engineer who selects ground motions from these databases neglects fling's static displacement by default".
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