EAGER: Rapid and Affordable Repair of Substandard Confined Masonry

这笔拨款为设计和执行一个实用和负担得起的系统的概念验证提供资金，以修复或改造高度不合格的限制砖石墙。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，这些地区容易发生地震活动，并且设计和施工实践很差。该系统由插入沟槽的铝条组成，并沿床缝嵌入砂浆中，从而提供水平加固以增强弹性。它采用可获得、相对便宜和耐用的材料作为一项康复战略，并促进技术的接受。概念验证将基于平面内荷载下的受限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。这些标本的设计和建造将反映两位pi（一名建筑师和一名结构工程师）在海地访问时获得的意见。弹性方面的强度，可变形性和损伤机制将通过研究砌体的贡献，嵌入式钢筋，钢筋混凝土约束，以及它们之间的相互作用进行分析研究。目前的设计和施工做法往往没有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，以促进对限制砌体的不合格实践的认识和理解，设计和建造不良的限制砌体墙的基线性能，以及快速和负担得起的修复和改造技术的潜力，这种技术的大规模部署是现实的。提出的概念证明是基于这样一种愿景，即从援助文化转变为使当地从业者能够独立修复其建造的设施，从而使他们有条件培养未来的从业者。

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.