钢筋混凝土结构内爆炸相似模型试验研究

Experimental study on similarity model of reinforced concrete structure under internal explosion

为了研究钢筋混凝土结构在内爆炸作用下的冲击波特征参量和结构毁伤的相似规律,建立了钢筋混凝土结构内爆炸相似理论模型,进行了结构原型和缩比系数分别为0.75和0.5的内爆炸相似性试验,对内爆炸冲击波特征参量和结构毁伤相似性进行了分析。结果表明,不同药量作用下各相似模型在典型位置处的内爆炸超压峰值具有相似的分布规律;药量服从相似准则时,0.75和0.5缩比方案的第一峰超压与原型的最大相对误差分别为10.33%和14.36%,前三波比例脉冲宽度与原型的最大相对误差分别为4.02%和5.25%;各缩比模型的压力时程曲线波形符合良好,证明各缩比模型之间的内爆炸特征参量存在相似规律;相似缩比模型在相同毁伤等级的药量作用下,可以从试验中得到相同的破坏程度和相似的破坏形态。

To research the similarity law of shockwave characteristic parameters and the structural damage of the reinforced concrete（ RC） structures under the internal explosion,the similarity theory model of the RC structure under the internal explosion is established,the similarity tests of the original model and the scale model with scale coefficient values of 0. 75 and 0. 5 are conducted,and thesimilarity law of the shockwave characteristics parameter and the structural damage of RC structures is analysed. The results show that the peak overpressure of similarity models in the typical locations under different charge weights has similar distribution characteristics. When the charge weights follow the similarity criteria,the maximum relative errors of the first peak overpressure and the scale pulse width of the first three peaks between the 0. 75 scale model and the original model are less than 10.33% and 4. 02% respectively. As the scale coefficient is 0. 5,the values are 5. 25% and 14. 36%respectively. Pressure-time history curves of the scale model are consistent with the original model,proving that the shockwave characteristic parameter of the scale models under the internal explosion obeys similar laws. The similarity scale models under the charge producing the same damage level can get the similar damage degree and failure modes.