Abstract
In this paper, a complicated single‐degree‐of‐freedom (SDOF) approach was developed to determine the global response of steel columns under combined axial and blast‐induced transverse loads. Nonlinear section and member analyses were incorporated into the suggested SDOF method to account for the complex features of the material behavior, the high strain rate effect, and the column geometry. The SDOF technique was validated through comparisons with available finite element and experimental data, and a good consistency was obtained. Then, the validated SDOF approach was utilized to derive the pressure‐impulse curves under various levels of axial loading. The level of the axial load was shown to have a significant influence on the dynamic behavior of a steel column subjected to a blast load.
Highlights
Increasingly frequent terrorist activities have made blast protection essential for engineering communities [1].e failure of load-bearing columns can result in the progressive collapse of structures. erefore, it is important to improve the reliability of vulnerable columns under blasts to ensure the safety of structures [2, 3].One of the most widely used approaches to assess the effects of blasts on structures is the equivalent single-degreeof-freedom (SDOF) approach
An SDOF model was developed to determine the global response of blast-loaded steel columns
To validate the SDOF method, the theoretical SDOF maximum displacements were compared with the finite element model (FEM) and experimental results in [5, 14], respectively. e results
Summary
Increasingly frequent terrorist activities have made blast protection essential for engineering communities [1]. Dragos and Wu [5] proposed a simplified SDOF approach based on the new concept of a reduced resistance-deflection function to derive the P-I diagram for steel columns. Structural elements are typically simplified as having perfectly elastic-plastic force-deformation relationships [7, 8]. A more accurate and sophisticated flexural behavior (featuring both the moment-curvature relationship and the force-deformation relationship) that considers the complex features of the slab geometry and the material’s behavior under high strain rate loading is incorporated into a nonlinear SDOF approach for the dynamic analysis of columns subjected to blast-induced shock waves under various levels of axial compressive loads. To validate the suggested SDOF approach, the structural loaddeformation characteristics, predicted maximum displacements, and iso-displacement P-I diagrams in this paper were compared against experimental and finite element model (FEM) results from [5, 14], respectively
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