<p>In the design of structural concrete for impact loading, design or model codes often employ a dynamic increase factor (DIF) to impose dynamic effect on static response. DIF that are obtained from material test results and that are currently adopted design codes like ACI 349M-06, fib Model Code 2010 and ACI 370R-14. However, DIFis too simple and limited to consider a variety of properties of materials, their application in practical design is questionable. In this study, DIF used in these three codes were validated through the finite element analysis of reinforced concrete (RC) and prestressed concrete (PSC) slab which were tested by other researcher. Consequently, it was found that DIF has great effect on the behavior of the structures so that selection of DIF should be very careful.</p>
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