Unreinforced masonry infill walls (MIWs) are prone to crack, fragment, and even collapse under blast loads, threatening the safety of building structures, as well as the inside occupants and equipment. Spray polyurea (SPUA) has been proven to be an excellent retrofitted material for MIWs to improve their blast resistance. Aiming to study the dynamic behaviors of brick MIWs under far-field range blast loads, the successive blast tests on seven unreinforced and SPUA-retrofitted brick MIWs with different thicknesses and boundary constraints were first carried out based on the developed compressed air-driven large cross-section (3m×3 m) shock tube. It was indicated that the blast resistance of MIWs significantly improved by increasing wall thickness and strengthening boundary constraint; SPUA coating can improve the blast resistance of MIWs and effectively suppress the debris generation and splash. Then, the equivalent single degree of freedom model based theoretical calculation and the simplified micro-model based numerical simulation methods previously established by authors were briefly introduced. Additionally, the dynamic behaviors of seven examined MIWs were further predicted and compared with test results, which verified the applicability of theoretical calculation and numerical simulation methods. Finally, the improved damage and failure evaluation criteria of unreinforced and SPUA-retrofitted MIWs were given, and the charge weight and standoff distance diagrams of typical MIWs were proposed based on the validated theoretical and numerical methods as well as the improved criteria, which would provide a helpful reference for blast-resistant evaluation and retrofitted design of brick MIWs.

中文翻译：

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无筋和喷涂聚脲改造砖砌体填充墙在爆炸荷载下的动态行为：激波管测试与分析

无筋砌体填充墙 (MIW) 在爆炸荷载下容易出现裂缝、破碎甚至倒塌，威胁建筑结构以及内部人员和设备的安全。喷涂聚脲 (SPUA) 已被证明是一种优秀的 MIW 改造材料，可提高其抗爆性能。为了研究砖MIW在远场爆炸载荷下的动态行为，首先基于开发的压缩空气驱动大十字，对7个不同厚度和边界约束的未加固和SPUA改装的砖MIW进行了连续爆炸试验。 -截面(3m×3m)激波管。结果表明，通过增加壁厚和加强边界约束，MIW的抗爆性能得到显着提高； SPUA涂层可以提高MIW的抗爆能力，有效抑制碎片的产生和飞溅。然后，简要介绍了作者先前建立的基于等效单自由度模型的理论计算和基于简化微观模型的数值模拟方法。此外，还进一步预测了7种水雷波的动态行为，并与试验结果进行了比较，验证了理论计算和数值模拟方法的适用性。最后，给出了改进的无加固和SPUA改装水雷舰的损伤和失效评估标准，并基于经过验证的理论和数值方法以及改进的标准提出了典型水雷波的装药重量和防区距离图，为对砖MIW的抗爆评估和改造设计有帮助的参考。