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Structural Engineering and Mechanics Volume 32, Number 2, May30 2009 , pages 283-300 DOI: https://doi.org/10.12989/sem.2009.32.2.283 |
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Validation study on numerical simulation of RC response to close-in blast with a fully coupled model |
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Shunfeng Gong, Yong Lu, Zhenguo Tu and Weiliang Jin
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| Abstract | ||
| The characteristic response of a structure to blast load may be divided into two distinctive phases, namely the direct blast response during which the shock wave effect and localized damage take place, and the post-blast phase whereby progressive collapse may occur. A reliable post-blast analysis depends on a sound understanding of the direct blast effect. Because of the complex loading environment and the stress wave effects, the analysis on the direct effect often necessitates a high fidelity numerical model with coupled fluid (air) and solid subdomains. In such a modelling framework, an appropriate representation of the blast load and the high nonlinearity of the material response is a key to a reliable outcome. This paper presents a series of calibration study on these two important modelling considerations in a coupled Eulerian-Lagrangian framework using a hydrocode. The calibration of the simulated blast load is carried out for both free air and internal explosions. The simulation of the extreme dynamic response of concrete components is achieved using an advanced concrete damage model in conjunction with an element erosion scheme. Validation simulations are conducted for two representative scenarios; one involves a concrete slab under internal blast, and the other with a RC column under air blast, with a particular focus on the simulation sensitivity to the mesh size and the erosion criterion. | ||
| Key Words | ||
| blast load; concrete component; numerical simulation; Eulerian solver; Lagrangian solver; hydrocode; mesh sensitivity. | ||
| Address | ||
| Shunfeng Gong: Institute of Structural Engineering, College of Civil Engineering and Architectural, Zhejiang Univ., 310058, P.R. China Yong Lu and Zhenguo Tu: Institute for Infrastructure and Environment, School of Engineering, University of Edinburgh, Edinburgh EH9 3JL, UK Weiliang Jin: Institute of Structural Engineering, College of Civil Engineering and Architectural, Zhejiang Univ., 310058, P.R. China | ||