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Title: Finite Element Simulation of Foam Insulated Precast Concrete Sandwich Panels Subjected to Blast Loads

Author(s): Charles M. Newberry, John M. Hoemann, Bryan T. Bewick and James S. Davidson

Publication: Symposium Paper

Volume: 281

Issue:

Appears on pages(s): 1-22

Keywords: blast load; finite element modeling; full-scale testing; large deflection behavior; load-deflection response; precast concrete; prestressed concrete; resistance function; sandwich panel; single-degree-of-freedom (SDOF) modeling.

DOI: 10.14359/51683621

Date: 12/27/2011

Abstract:
This paper discusses simulation methodologies used to analyze large deflection static and dynamic behavior of polymeric foam insulated concrete sandwich wall panels. Both conventionally reinforced cast-on-site panels and precast prestressed panels were considered. The experimental program used for model validation involved component-level testing, as well as both static and dynamic testing of full‐scale wall panels. The static experiments involved single span and double span sandwich panels subjected to near‐uniform distributed loading. The dynamic tests involved spans up to 30 ft tall that were subjected to impulse loads generated by an external explosion. Primary modeling challenges included: (1) accurately simulating prestressing initial conditions in an explicit dynamic code framework, (2) simulating the concrete, reinforcement, and foam insulation in the high strain rate environment, and (3) simulating shear transfer between wythes, including frictional slippage and connector rupture. Correlation challenges, conclusions and recommendations regarding efficient and accurate modeling techniques are highlighted. The modeling methodologies developed are now being used to conduct additional behavioral studies and parametric analyses, and assess and improve methodology currently used in the design of foam insulated precast/prestressed sandwich panels for blast loads.