爆炸荷载作用下喷涂聚脲加固砌体墙的损伤破坏机理与设计方法

重要基础设施和化工厂房面临潜在的恐怖和偶然性爆炸威胁，爆炸事故中75%的人员伤亡来自墙体和玻璃等飞溅碎片，喷涂聚脲是优异的墙体抗爆加固材料。本项目拟围绕砌体墙抗爆性能评估和喷涂聚脲加固抗爆计算与设计，开展喷涂聚脲的静、动态力学性能，聚脲加固砌体墙破坏模式判别准则和抗力函数、足尺砌体填充墙抗爆性能的理论、试验和高精度数值仿真研究。有望建立宽应变率范围内喷涂聚脲的本构模型，以及爆炸荷载作用下未（喷涂聚脲）加固砌体墙动态响应和损伤破坏的理论计算模型和数值仿真分析方法。揭示爆炸荷载下喷涂聚脲加固砌体墙的损伤破坏机理，提出RC框架砌体填充墙抗爆性能评估和喷涂聚脲加固计算方法，开发设计软件，拟定《指南》，开展工程应用。预期成果可为《民用建筑抗爆设计规范》中既有和新建建筑抗爆评估、加固与设计提供理论基础和技术支撑，对于提升重要经济目标的抗爆生存能力，有效保障人民生命财产安全具有重要的研究价值和工程意义。

The important infrastructures and chemical plants are threatened by the terroristic and accidental explosions, in which nearly 75% casualties are caused by the blast induced masonry and glass fragments, and the spray polyurea is an outstanding blast-retrofitting material. The blast resistance evaluation and spray polyurea retrofitting design of masonry wall are addressed in this project. The static and dynamic mechanical properties of spray polyurea, failure mode judging criterion and resistance function of spray polyurea reinforced masonry wall, as well as the blast resistance of prototype masonry infill wall will be studied theoretically, experimentally and numerically. It is expected that, the constitutive model of spray polyurea applicable within the wide range of strain rate, as well as the theoretical calculation model and numerical simulation approach for the dynamic responses and damage of bare/spray polyurea retrofitted masonry wall under blast loadings will be established. The damage and failure mechanism of the spray polyurea reinforced masonry wall under blast loadings will be revealed. Besides, the blast resistance evaluation and retrofitting calculation approaches of RC frame with masonry infill wall will be proposed. The corresponding design software and guidance will be programed and issued, and the practical engineering applications will be performed, respectively. The present work can provide the theoretical basis and technical support for the evaluation and retrofitting design of the existing and new buildings under blast loadings regulated in the “Blast-resistant design specification of civil building structure”, which has important theoretical and practical application meanings in enhancing the survivability of key economic infrastructures under blast loadings, and guaranteeing the safety of human life and property.