A similarity analysis method for dynamic response of steel beam under blast loading
During the testing of scaled models to simulate a nuclear explosion using a chemical explosion,it is necessary to implement specific measures such as restraint and sealing to prolong the duration of the chemical explosion.Although these measures ensure geometric similarity in structural deformation,they also amplify the testing costs and complexities,particularly when scaling down the model,resulting in significant inaccuracies.To address this limitation,this paper proposes a novel method for similarity analysis of the dynamic response of steel beams under blast loading.The proposed method's accuracy was validated through numerical calculations,revealing that geometric similarity can be maintained during the elastic response stage,subject to certain conditions,including the use of the same material for both the scaled model and the prototype,similarity in geometric shape,and equivalence of the equivalent static load between the chemical explosion model and the prototype structure.However,the maximum mid-span displacement fails to satisfy geometric similarity during the plastic response stage.Under the condition that the duration of the scaled model's explosion load is longer than the minimum action time,the similarity relationship between the model and the prototype can be expressed as the product of the geometric similarity coefficient and the ductility ratio coefficient,with the analytical expression for the latter provided.
steel beamblast loadsimilarity analysisdynamic responseequivalent static loadductility ratio coefficient
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维普
