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

最近的事件突出表明，必须保护民用基础设施，使其免受炸弹袭击或意外爆炸造成的爆炸载荷的影响。加拿大的旧建筑物中有很大一部分是在现代规范之前建造的无钢筋砌体（URM），这使得它们在平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）中的URM墙。以提高爆破性能，确保加拿大人的安全。* 本项目将研究使用由Simpson Strong Tie开发的新型复合加固系统的潜力，以增加旧砌体建筑中URM墙的平面外抗爆性。改造涉及安装薄的织物增强水泥基质（FRCM），它将高性能水泥砂浆与碳纤维网格相结合，以创建一个薄的结构层，可用于加强旧建筑中有缺陷的URM墙。作为该项目的一部分，两个全尺寸的URM墙，一个由混凝土砌体和一个由石砌体制成，将与FRCM系统改造，并在爆炸载荷下使用渥太华大学的激波管进行测试，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，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.**