Seismic Strengthening of Unreinforced Masonry Structures with Fiber Composite Fabrics

该项目由小 探索性研究赠款（SGER， 手册NSF-89 - 85）计划。 由于其高拉伸强度、耐久性， 和上级疲劳性能， 材料越来越多地应用于民用领域， 工程建设。 一名该等 应用涉及使用玻璃纤维 抗震用钢筋、薄板或钢丝 修复或加固现有结构。 这种技术的一些成功已经被 在多个案例应用中得到证明 世界各地 玻璃纤维增强技术的使用 已经成功地测试了 钢筋混凝土结构构件， 如梁和桥墩。 然而，在这方面， 这种类似应用的可行性， 无钢筋砌体（URM）建筑-- 国家最脆弱的现存建筑 股票的地震风险--并没有被严重地 探讨了 这个项目冒险进入这样一个 新的研究领域，有可能 发展一个技术上健全和具有成本效益的 工程措施，以加强现有的 地震区的URM建筑。 这项探索性研究的目的是 该项目旨在证明 URM结构的抗震加固 环氧树脂粘合复合纤维到外部 结构的表面。 的重点 研究内容包括：（a）确定粘结行为 复合织物的砌体，和（B）， 研究玻璃纤维的有效性， 成本加固材料。

This project is supported under the Small Grants for Exploratory Research (SGER, Brochure NSF-89-85) Program. Due to their high tensile strength, durability, and superior fatigue behavior, composite materials have been increasingly applied in civil engineering constructions. One of such applications involves the use of fiber-glass reinforcement, sheets, or wires for seismic repair or strengthening of existing structures. Some success of such techniques has been demonstrated in several case applications around the world. The use of glass-fiber reinforced techniques have been successfully tested in strengthening of reinforced concrete structural members such as beams and bridge-column piers. However, the feasibility of such similar applications to unreinforced masonry (URM) buildings--one of the nation's most vulnerable existing building stocks to seismic hazard--has not been seriously explored. This project ventures into such a new research area where there is a potential to develop a technically-sound and cost-effective engineering measure to strengthen existing URM buildings in the nation's seismic regions. The objective of this exploratory research project is to demonstrate the feasibility of seismic strengthening of URM structures by epoxy-bonding composite fibers to the exterior surfaces of the structure. The focus of the study are: (a) to determine the bond behavior of composite fabrics to masonry, and (b) to study the effectiveness of glass fibers as low- cost reinforcement materials.