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Abstract
The present work deals with the analysis and design philosophy of steel
structures subjected to different types of blast loading. Architectural and
structural aspects as well as cost considerations were illustrated for blast resistant design. Literature review of previous work concerning blast design of steel structures, damage assessment method as well as blast capacity considerations were presented. In addition, an extensive. survey for explosives and the explosion characteristics and process has been described in details. The blast loadings on structures caused by explosive detonation were presented using empirical equations and plotted curves. An iterative method has been introduced in order to determine the collapse mechanism of rigidly-jointed steel structures when subjected to equivalent static blast loads.
The derived mathematical equations have been formed considering beamcolumn
stiffness degradation, effect of axial force as well as the P-Δ effects.
Verification of the computer program was performed in the analysis of
rigidly jointed steel frames and roof trusses. The collapse mechanisms results
were compared with those from ANSYS program as well as previous published work.
Different analysis approaches for structures subjected to blast loads were
described. These approaches are simplified analysis approaches, as such as dynamically equivalent system approach and non-linear dynamic approach.
The validity of equivalent static representation of blast loads according to available codes and manuals were compared with the exact representation
(dynamic).
A mathematical model was suggested in order to describe the non-linear
elastic-plastic dynamic (time history) analysis and the behavior of such
structures are suggested. The model is capable to detect the complex behavior
of steel structures under blast loadings. Two examples were solved using the empirical formulae as well as ANSYS program. The obtained results were
compared in order to show the accuracy of the adapted solution.