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In this study, the linear and nonlinear seismic behavior of a 2D ten story steel model frame is investigated in four cases: Without Isolation (WI), Base Isolation (BI), Roof Isolation (RI) and Two Top Floor Isolation (2TFI). Friction Pendulum System (FPS) is used for base and top floor isolations. First, the selected model without any isolation was used as a base for comparison of the seismic behavior of models. For dynamic analysis two types of base acceleration was used namely: 1- 1979 El Centro earthquake, 2- A newly proposed base acceleration similar to displacement oscillation proposed in FEMA 461 code. In the two cases, the maximum equivalent standard acceleration at DBE level spectrum with duration of 8 seconds was used. For the WI frame Nonlinear Statical Analysis (Pushover or POA) was used by applying UBC-97 loading code. The concluding result shows that in linear and nonlinear ranges BI frame shows comparatively superior seismic behavior for MCE and DBE earthquake levels. Results of POA of WI frame according to UBC-97 code shows better behavior than that of dynamical analysis. RI frame in nonlinear range shows better behavior than WI frame using POA. Two Top Floor Isolation frame shows better behavior both in linear and nonlinear ranges compared to both RI and WI frames. The details of the behavior of all frames are shown in various diagrams.

Comparative Study of Linear and Nonlinear Seismic Behavior of Non-Isolated, Base-Isolated and Top Floor (TMD-Type) Isolated Structural Frames