Use of FRCM for the blast retrofit of load-bearing masonry walls in older buildings**

最近的事件突出表明，有必要保护民用基础设施免受炸弹袭击或意外爆炸造成的爆炸载荷的影响。加拿大的老建筑库存中有很大一部分是在现代规范之前建造的未加固砌体（URM），这使得它们在面外爆炸荷载的影响下特别容易倒塌。因此，迫切需要开发新的方法来改造脆弱结构（政府办公室，大使馆等）的URM墙，以提高爆炸性能并确保加拿大人的安全。****该项目将研究使用Simpson Strong Tie开发的新型复合增强系统的潜力，以增加旧砖石建筑中URM墙的面外抗爆能力。改造包括安装薄纤维增强水泥基质（FRCM），它结合了高性能水泥砂浆和碳纤维网格，形成薄结构层，可用于加强旧建筑中缺乏URM的墙壁。作为项目的一部分，两个全尺寸的URM墙，一个由混凝土砌体制成，一个由石头砌体制成，将用FRCM系统进行改造，并使用渥太华大学的激波管在爆炸载荷下进行测试，该激波管能够安全准确地模拟爆炸产生的爆炸载荷。该项目将产生一种新的改造方法，将提高加拿大建筑物的爆炸安全性

Recent events have highlighted the need to protect civilian infrastructure against the effects of blast loads caused by bomb attacks or accidental explosions. A large portion of Canada's older building inventory is of unreinforced masonry (URM), built prior to modern codes, making them especially vulnerable to collapse under the effects of out-of-plane blast loads. Thus, there is an important need to develop novel methods to retrofit URM walls in vulnerable structures (Government offices, Embassies, etc.) to improve blast performance and ensure safety of Canadians. ****This project will examine the potential of using a novel composite strengthening system developed by Simpson Strong Tie to increase the out-of-plane blast resistance of URM walls in older masonry buildings. The retrofit involves the installation of a thin Fabric-Reinforced Cementitious Matrix (FRCM), which combines a high-performance cementitious mortar with a carbon-fiber grid, to create a thin structural layer that can be used to strengthen deficient URM walls in older buildings. As part of the project, two full-scale URM walls, one made of concrete masonry and one made of stone masonry, will be retrofitted with the FRCM system and tested under blast loads using the University of Ottawa Shock-tube, which is capable of safely and accurately simulating the blast loads generated by explosions. The project will result in a novel retrofit method that will increase the blast safety of buildings in Canada.**