Attributed to the promotion of environmental protection and efficient construction, the precast concrete (PC) columns are gradually replacing the traditional reinforced concrete (RC) columns as the main load-bearing members of building structures. However, with the aggravation of deliberate or accidental explosions, there is a lack of study on the damage modes as well as dynamic responses of grouting sleeve connected PC columns. To systematically assess and compare the blast resistance of PC and RC columns, four PC columns and two control RC columns were firstly fabricated and tested under close-in explosions, in which the influences of the scaled distance (0.50 m/kg and 0.61 m/kg), burst height (1/4- and 1/2-heights of column, i.e., 0.75 m and 1.5 m) and axial compression ratio (0.18 and 0.36) were experimentally examined. Secondly, the present test on PC/RC columns and the existing contact explosion test on PC specimens were numerically simulated. The reliability of the adopted numerical simulation approach was comprehensively verified by comparing the test and predicted incident and reflected overpressure-time histories, as well as the damage modes and displacement-time histories of specimens. Finally, the blast resistances of the prototype PC and RC columns under four design basis threats specified by U.S. Federal Emergency Management Agency were assessed, and the corresponding site mitigation measures were proposed. It indicates that, compared with RC columns, PC columns exhibited greater blast resistance, i.e., slighter maximum and residual lateral displacements, as well as concrete spalling sizes. However, both of PC and RC columns cannot survive under the contact explosion of suicide vests (9 kg of TNT equivalence) or the explosion induced by sedan bombs (454 kg of TNT equivalence) near the sidewalks at the standoff distance of 4 m.

中文翻译：

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近距离爆炸下灌浆套筒连接预制混凝土柱的抗爆性能

随着环保和高效施工的提倡，预制混凝土（PC）柱正逐渐取代传统的钢筋混凝土（RC）柱成为建筑结构的主要承重构件。然而，随着故意或意外爆炸事件的加剧，目前对灌浆套筒连接PC柱的破坏模式及动力响应的研究还比较缺乏。为了系统地评估和比较 PC 和 RC 柱的抗爆性能，首先制作了 4 根 PC 柱和 2 根对照 RC 柱，并在近距离爆炸下进行了测试，其中缩放距离（0.50 m/kg 和 0.61 m/kg）的影响kg）、爆破高度（柱高的1/4和1/2，即0.75 m和1.5 m）和轴压比（0.18和0.36）进行了实验检验。其次，对现有的PC/RC柱试验和现有的PC试件接触爆炸试验进行了数值模拟。通过比较试验和预测事件、反映的超压时程以及试件的损伤模式和位移时程，综合验证了所采用数值模拟方法的可靠性。最后，对原型PC和RC柱在美国联邦紧急事务管理局规定的四种设计基准威胁下的抗爆性能进行了评估，并提出了相应的现场缓解措施。结果表明，与 RC 柱相比，PC 柱表现出更大的抗爆能力，即最大侧向位移和残余侧向位移以及混凝土剥落尺寸更小。然而，无论是在自杀背心（9 kg TNT 当量）的接触爆炸还是在人行道附近 4 m 距离的轿车炸弹（454 kg TNT 当量）引发的爆炸下，PC 和 RC 纵队均无法生存。