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Flexural Models of Reinforced Concrete Beams ...
Flexural Models of Reinforced Concrete Beams
Under Blast Load.
Nowadays, the issue of structural safety under blast loading has become a dramatic problem. The tragic news of the terrorist attacks of recent years raise important, urgent questions regarding the real safety and reliability of our buildings. Extreme loads such as impacts, explosions, etc., can occur in everyday life with unexpectedly high frequency. This seminar deals with the flexural failure of Reinforced Concrete beams under blast loads. The main aim is to develop dynamic and energy models capable of evaluating the response of R.C. under explosive load. The seminar is composed of three sections. Various dynamic models are developed in Section 1, taking into account the strain-rate sensitivity of both steel and concrete, as well as other nonlinearities in structural behaviour. In Section 2, the same problem is solved in a different way: starting from the principle of energy conservation. This procedure, less accurate than the previous one, produces very good results regarding midspan displacement, especially as it requires less computation time. In order to better understand the phenomenon, with the aim of identifying the key parameters in structural response, a sensitivity analysis is developed in Section 3. In this way it is possible to attain simple predictive polynomial formulations and, finally, simple table for early structural assessment of beams under blast load during the design procedure.
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