Abstract
This paper concerns the dynamic analysis of shell structures, with emphasis on application to steel and steel-concrete composite blast resistant doors. In view of the short duration and impulsive nature of the blast loading, an explicit integration method is adopted. This approach avoids time-consuming computations of structural stiffness matrix and solving of simultaneous nonlinear equations. Single-point quadrature shell elements are used, with numerical control to suppress spurious hourglass modes. Composite shells are handled by an appropriate integration rule across the thickness. Both material and geometric nonlinearities are accounted for in the formulation. Contact and gap problems are considered using bilinear spring elements in the finite element analysis. Numerical examples are presented for some benchmark problems and application study to blast resistant doors. Good correlation is generally obtained between the numerical results based on the software developed and the results obtained by other means including field blast tests.
Highlights
Blast resistant doors are commonly used in defence shelters, ammunition storage dumps and blast-resistant structures alike
Recent studies on blast resistant structures mainly dealt with reinforced concrete structures, see [1,2,3,4,5] for example
Non-iterative schemes are available if the advantage of high concurrency for the explicit dynamic analysis is to be exploited towards vectorization and parallel computing [11]
Summary
Blast resistant doors are commonly used in defence shelters, ammunition storage dumps and blast-resistant structures alike. Correct modelling of the nonlinear behaviour of blast resistant doors under severe loading is essential in their safe and cost-effective design. C.G. Koh et al / Dynamic analysis of shell structures with application to blast resistant doors brane mode and bending mode which, in general, are of different orders of magnitude in stiffness effects. With rapid advances in computer hardware, the finite element method has proven to be a versatile and powerful tool for nonlinear dynamic analysis of shell structures. In blast resistant door designs, steel and concrete materials are commonly used. The sandwich-like structure would require composite elements in the analysis In this regard, the explicit dynamic approach developed by Koh et al [11] for 4-node composite shells is adopted for the dynamic analysis of blast resistant doors. Nonlinear effects due to geometry updates are accounted for by means of the updated Lagrangian formulation
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