A New Simplified Design Method For Steel Structures Under Impulsive Loading
Free (open access)
C. Colomer Segura & M. Feldmann
The dynamic response of structures under impulsive loading is a complex process where both geometric and material nonlinearities play a very important role. The use of Finite Element calculations is advisable for the design of structures that must withstand impulsive action (blast or impact), but designers very often lack the resources to perform these calculations, thus simplified design methods are often used, mainly based on the reduction of the original system to dynamically equivalent SDOF system. Most of the existing approaches suffer from shortcomings when having to deal with arbitrary support conditions, to consider catenary effects or to consider interaction effects with surrounding parts of the structure. In order to overcome these limitations, the Institute of Steel Construction has proposed a new 2-DOF dynamically equivalent system reduction, which allows for the explicit consideration of catenary action including connector failure and opens new possibilities for integration with more complex Finite Element models. Within this new approach, the connectors are treated distinctly, so that a separate assessment of its failure is possible. Keywords: equivalent system, SDOF, system reduction, geometrical nonlinearities, dynamically equivalent system, beam reduction, FEM.
equivalent system, SDOF, system reduction, geometrical nonlinearities, dynamically equivalent system, beam reduction, FEM.