Seismic Strengthening of Unreinforced Masonry Structures with Fiber Composite Fabrics

纤维复合织物无筋砌体结构的抗震加固

• 批准号: 9201110
• 负责人: Mo Ehsani
• 金额: $ 3.5万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-01-15 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9201110&HistoricalAwards=false
• 关键词: Seismic; Strengthening; Unreinforced; Masonry; Structures

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.

本项目为探索性研究小额资助项目（SGER，小册子NSF-89-85）。复合材料由于具有高抗拉强度、耐久性和优异的疲劳性能，在土木工程建设中得到越来越多的应用。其中一种应用包括使用玻璃纤维加固、薄板或钢丝进行地震修复或加固现有结构。这种技术的一些成功已经在世界各地的几个案例应用中得到了证明。玻璃纤维增强技术在钢筋混凝土结构构件（如梁和桥柱墩）的加固方面已取得成功。然而，这种类似应用于无加固砌体（URM）建筑的可行性——这是美国最容易受到地震危害的现有建筑之一——还没有得到认真的探索。这个项目冒险进入了这样一个新的研究领域，在这个领域有潜力开发一种技术上合理且具有成本效益的工程措施，以加强国家地震区现有的URM建筑。本探索性研究项目的目的是证明环氧复合纤维与结构外表面结合对URM结构进行抗震加固的可行性。研究的重点是：(a)确定复合织物与砌体的粘结行为；(b)研究玻璃纤维作为低成本增强材料的有效性。