How to stabilize the response after mainshock analysis, extra ground acceleration whose magnitudes are zero over the time period of 10 sec is added between mainshock and aftershock ground motions?
The first part of this text file is the main earthquake record.
If you want to preform a NTHA or IDA analysis with the effects of main shock and after shock it is better to build a text file as follow:
The first part of this text file is the main earthquake record. Then you must have at least 100 seconds with zero acceleration amplitude as a gap between main shock and after shock. Then put the after shock, after these 100 sec. This gap is due to the enough time for free vibration response of structure. In some references after shock is the main shock which is multiplied by 0.85 factor.
Ma Cho Wai Phyo Kyaw, To input mainshock-aftershock sequences effectively into non-linear time history analysis, a systematic approach can be followed. Initially, select mainshock and aftershock ground motions, taking into account factors like earthquake source magnitude, distance, and site conditions. These motions should be chosen to represent the expected seismic hazard accurately.
Next, scale these ground motions to the desired intensity level, aligning with the chosen design criteria or performance objectives for the structure. Assembling the mainshock-aftershock sequence is the subsequent step. This can be accomplished through various methods, often involving random selection processes that generate a sequence from the selected ground motion records. Performing the non-linear time history analysis is crucial and should encompass the entire mainshock-aftershock sequence. To stabilize the response after the mainshock analysis, several approaches can be employed. One common method is using a "zero-pad," which involves introducing a zero-amplitude ground motion record for a specified time period between the mainshock and aftershock motions. This period, known as the zero-pad duration, allows the structure's response to settle.
Alternatively, you can ensure a smoother transition between the mainshock and aftershock motions. This can be achieved by employing techniques like a weighted average of the two ground motions or employing filtering methods. The specific approach chosen depends on the analysis software used and the characteristics of the ground motions involved.
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