1-SDOF
This educational javascript applet solves the linear time-history dynamic response of a single-degree-of-freedom when subjected to an earthquake, so the input is a ground motion record of accelerations file.
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The mass of the system is equal to 1, so the stiffness is computed based on the user-defined fundamental period
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You can input your own ground motion record (in units of g) jointly with the time-step sampling
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The height of the system is iqual to 1 and there is no deformation on the bar (shear building)
Reference: Dynamics of structure, AK Chopra.