For situations requiring large numbers of parametric analysis, complex nonlinear models are too computationally intensive to be used. Instead, simplified engineering models (such as single degree of freedom) are often substituted, but at the risk of reduced fidelity in representing the response of the structure. In this paper, a hybrid method is presented whereby a complex ADINA model of a frame building is combined with a simplified engineering model to yield a physics-based fast-running model for computing the building's response to a range of blast loadings. This method allows realistic modeling of the load-deflection characteristics of each lateral load resisting frame (based on the nonlinear material properties and actual framing and bracing sizes and geometry) while running sufficiently quickly to allow analysis of numerous loading scenarios. The building analyzed is the Vertical Integration Building (VIB) at Cape Canaveral Air Station in Florida, a more than 200-foot high steel braced frame structure. Its analysis is part of ongoing range safety activities sponsored by the US Air Force 30th and 45th Space Wings, Safety Directorates.
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