Development of dimensionless P-I diagram for curved SCS sandwich shell subjected to uniformly distributed blast pressure

Abstract

The curved steel-concrete-steel (SCS) sandwich shell was recently proposed to resist blast loading and it showed better blast resistant performance as compared to flat SCS sandwich shell via developing compressive force along the shell. In this paper, a dimensionless Pressure-Impulse (P-I) diagram was constructed as a convenient tool to predict the damage level of curved SCS sandwich shell subjected to uniformly distributed blast loading. The curved SCS sandwich shell was equivalent to a single-degree-of-freedom (SDOF) system and the equation of motion was established by employing the Lagrange’s equation. To construct the dimensionless P-I diagram, the energy balance method was utilized to yield the pressure and impulse asymptotes and the responses in the dynamic response regime were obtained via employing the SDOF method. Then, the finite element method was employed to validate the developed dimensionless P-I diagram. Finally, the procedures of using the constructed dimensionless P-I diagram to quickly conduct the blast resistant design of curved SCS sandwich shell were presented.

Keywords

blast loading / curved steel-concrete-steel sandwich shell / Pressure-Impulse diagram / single-degree-of-freedom method / finite element analysis

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Acknowledgments

The research presented in this paper was financially supported by the National Natural Science Foundation of China (Grant No. 51608151), the China Postdoctoral Science Foundation (Nos. 2017T100245, 2016M600252), Heilongjiang Postdoctoral Fund (No. LBH-Z16063) and the Fundamental Research Funds for the Central Universities (No. HIT.NSRIF.2019069).

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