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An Accurate Analysis for Sandwich Steel Beams with Graded Corrugated Core Under Dynamic Impulse

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Abstract

This paper addresses the dynamic loading characteristics of the shock tube onto sandwich steel beams as an efficient and accurate alternative to time consuming and complicated fluid structure interaction using finite element modeling. The corrugated sandwich steel beam consists of top and bottom flat substrates of steel 1018 and corrugated cores of steel 1008. The corrugated core layers are arranged with non-uniform thicknesses thus making sandwich beam graded. This sandwich beam is analogous to a steel beam with web and flanges. Substrates correspond to flanges and cores to web. The stress–strain relations of steel 1018 at high strain rates are measured using the split-Hopkinson pressure. Both carbon steels are assumed to follow bilinear strain hardening and strain rate-dependence. The present finite element modeling procedure with an improved dynamic impulse loading assumption is validated with a set of shock tube experiments, and it provides excellent correlation based on Russell error estimation with the test results. Four corrugated graded steel core arrangements are taken into account for core design parameters in order to maximize mitigation of blast load effects onto the structure. In addition, numerical study of four corrugated steel core placed in a reverse order is done using the validated finite element model. The dynamic behavior of the reversed steel core arrangement is compared with the normal core arrangement for deflections, contact force between support and specimen and plastic energy absorption.

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Acknowledgements

We gratefully acknowledge the financial support from the U.S. Department of Homeland Security (Award 2008-ST-061-TS0002-02) to the University of Connecticut through Center for Resilient Transportation Infrastructure (Director: Prof. Michael Accorsi). We also acknowledge material processing and characterization by Prof. Rainer Hebert’s group at University of Connecticut and strain rate dependent properties and shock tube test provided by Prof. Arun Shukla’s group at University of Rhode Island.

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  1. Department of Civil and Environmental Engineering, University of Connecticut, 261 Glenbrook Rd., U-3037, Storrs, CT, 06269, USA

    Asmita Rokaya & Jeongho Kim

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  1. Asmita Rokaya
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  2. Jeongho Kim
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Correspondence to Jeongho Kim.

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Rokaya, A., Kim, J. An Accurate Analysis for Sandwich Steel Beams with Graded Corrugated Core Under Dynamic Impulse. Int J Steel Struct 18, 1541–1559 (2018). https://doi.org/10.1007/s13296-018-0062-6

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  • DOI: https://doi.org/10.1007/s13296-018-0062-6

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