爆炸荷载作用下钢筋混凝土构件的缩尺效应OA

To investigate the scaling effect on reinforced concrete(RC)members under blast loads,numerical models were established based on existing explosion test data from RC members with various scaling factors.The research primarily focused on the scaling effect of the concrete material strain rate and demonstrated the feasibility of using scaled finite element models to predict the dynamic response of prototype structures.The results show that if the scaling effect of strain rate is not considered,the smaller the scaling factor,the less the damage and dynamic response of the scaled numerical model match the similarity criteria.For a scaling factor of 0.1,the mid-span displacement errors of RC beams at scaled blast distances of 0.50 m·kg-1/3 and 0.44 m·kg-1/3 are 32.5%and 75.1%,respectively.The mid-span displacement errors of RC slabs at scaled distances of 0.591 m·kg-1/3 and 0.518 m·kg-1/3 are 45.08%and 46.93%,respectively.After scaling the dynamic increase factor(DIF)curve,the results of numerical model calculations align more closely with similarity ratios,with errors generally less than 10%.Finally,a process was proposed for predicting the dynamic response of prototype structures using scaled test results.