EAGER: Rapid and Affordable Repair of Substandard Confined Masonry

这笔赠款提供资金，用于设计和执行一个实用和负担得起的系统的概念证明，以修复或改造高度不合格的限制砌体墙。 这种建筑风格在世界各地的发展中地区的低层住宅结构中占主导地位，这些地区易于发生地震活动，并且设计和施工实践普遍较差。 拟议的系统包括铝条插入槽和嵌入砂浆沿着床缝，从而提供水平钢筋，以提高弹性。 它将可获得、相对便宜和耐用的材料作为一项重建战略，并促进技术的接受。 概念验证将基于面内荷载下约束砌体墙样本的实验室测试，模拟无作用、修复（损坏后）和改造（加载前）场景。 标本的设计和建造将反映两名PI（一名建筑师和一名结构工程师）在海地访问时获得的投入。 通过研究砌体、预埋钢筋、钢筋混凝土约束及其相互作用，分析研究强度、变形能力和破坏机制方面的回弹力。当前的设计和施工实践往往未能认识到发展中地区的经济和技术限制。 通过这项研究，将获得信息和实验证据，以促进知识和理解的具体约束砌体，基线性能设计和施工不良的约束砌体墙，并迅速和负担得起的维修和改造技术的潜力，其大规模部署是现实的不符合标准的做法。 拟议的概念验证是根据从援助文化转变为使当地从业人员能够独立修复其建筑设施的文化的愿景，从而使他们能够培训未来的从业人员。

This grant provides funding to design and execute a proof of concept for a practical and affordable system to repair or retrofit highly substandard confined masonry walls. This construction style is predominant in low-rise residential structures in developing areas around the world that are prone to seismic activity, and where poor design and construction practices are common. The proposed system consists of aluminum strips inserted into grooves and embedded in mortar along the bed joints, thereby providing horizontal reinforcement to enhance resilience. It enlists accessible, relatively inexpensive and durable materials as a strategy for rehabilitation, and to facilitate technology acceptance. The proof of concept will be based on laboratory tests of confined masonry wall specimens under in-plane loads, simulating no action, repair (after damage), and retrofit (prior to loading) scenarios. Design and construction of the specimens will reflect input gained from a visit in Haiti by the two PIs (an architect and a structural engineer). Resilience in terms of strength, deformability and damage mechanisms will be investigated analytically by studying the contribution of masonry, embedded reinforcement, reinforced concrete confinement, and interactions thereof.Current design and construction practices often fail to acknowledge the economic and technological limitations found in developing areas. Through this research, information and experimental evidence will be gained to advance the knowledge and understanding of substandard practices specific to confined masonry, baseline performance of poorly designed and constructed confined masonry walls, and the potential of a rapid and affordable repair and retrofit technology whose deployment on a large scale is realistic. The proposed proof of concept is pursuant to the vision of shifting from the culture of aiding to that of enabling local practitioners to independently rehabilitate their constructed facilities, thereby also putting them in the condition to train future generations of practitioners.