Upgrading In-Plane Strength of Existing URM Walls by Fiber Composites

9422010 Goel最近的地震已经证明了无筋砌体（URM）墙结构所带来的生命安全危险。 建议采用纤维复合材料对URM墙体进行加固。复合材料的柔韧性、重量轻和高抗拉强度使其成为加固砌体结构的理想材料。 最近的一项研究表明，在静态载荷下，可以实现强度和延性的显着增加。 本研究项目的主要目标是研究用纤维复合材料加固的无筋砌体（URM）墙的平面内循环性能，并开发现有URM结构抗震加固的分析和设计程序。 将测试六个墙样本，每个样本约8英尺宽，10英尺高。两个不同的高度与厚度比（h/t = 14和28）的一个或两个wythes的砖建造将被检查。用环氧树脂粘合到墙壁上的复合织物将完全覆盖墙壁的两个面，或者将作为间隔开的垂直条带并交错地施加在墙壁的相对面上。 测试结果将用于制定URM结构改造的设计指南。拟议的研究将密切配合一个平行的研究调查的平面外循环行为的纤维增强URM墙在亚利桑那大学。 ***

9422010 Goel Recent earthquakes have demonstrated the life safety hazard posed by unreinforced masonry (URM) wall structures. It is proposed to strengthen the URM walls by fiber composites. The flexibility, light weight and high tensile strength of composites makes them an ideal material for strengthening masonry structures. A recent study has demonstrated that significant increases in strength and ductility could be achieved for static loading. The primary objective of this research project will be to study the in-plane cyclic behavior of unreinforced masonry (URM) walls strengthened with fiber composites and to develop analysis and design procedures or seismic strengthening of existing URM structures. Six wall specimens,each approximately 8 ft wide and 10 ft tall, will be tested. Two different height to thickness ratios (h/t = 14 and 28) constructed of one or two wythes of bricks will be examined. Composite fabrics epoxied to the wall will either fully cover both faces of the wall, or will be applied as vertical strips spaced apart and staggered on the opposite faces of the wall. Test results will be used to develop design guidelines for retrofitting of URM structures. The proposed research will be closely coordinated with a parallel research investigating the out of plane cyclic behavior of fiber reinforced URM wall at the University of Arizona. ***