Collaborative Research: Resilient and Sustainable Engineered Fiber-Reinforced Earthen Masonry for High Wind Regions

合作研究：强风地区的弹性和可持续工程纤维增强土砌体

• 批准号: 1131175
• 负责人: Esther Obonyo
• 金额: $ 8.5万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1131175&HistoricalAwards=false
• 关键词: Collaborative; Research; Resilient; Sustainable; Engineered

This collaborative research aims at experimentally and theoretically quantifying the structural resilience of a new fiber reinforced earthen masonry system for dwellings in high wind regions. This goal will be achieved by engineering and prototyping stabilized earth blocks and mortar, both enhanced with addition of natural fibers, and verifying the structural response of full-scale walls through physical testing. Engineering of the mortar and blocks will be based on two criteria: optimization of the amount of stabilizer and fibers, and compatibility of block and mortar where the target strengths are defined to force failure in the mortar joints. Engineering of the wall system will be based on the formulation and verification of interaction laws between applicable in-plane and out-of-plane forces. The interaction laws will be based on constitutive models obtained from the characterization of materials and scaled subassemblies. The collaboration involves faculty at the University of South Carolina, the University of Nebraska-Lincoln and the University of Florida, with one PhD student at each institution. The engineering and characterization of the blocks and mortar will be lead by the University of Florida and the University of Nebraska-Lincoln, respectively. The engineering of the walls, including analysis and experimental verification, will be lead by the University of South Carolina, Columbia. The outcome will be a prototype block and mortar combination. The verification of the selected system will be based on proof-tests of full-scale wall specimens under in-plane, out-of-plane, and pendulum impact load simulating the impact energy of representative flying debris, which typically cause human deaths and injuries. The proposed research will advance knowledge and technology by engineering both the mortar and blocks to enhance damage tolerance, and through the verification of structural system and predictive analytical models based on full-scale experiments. The final outcome of the project will be a novel, affordable, energy efficient and locally appropriate system for rural dwellings that is designed to withstand high wind loads, such as those experienced in the Midwestern and the Southeastern US. The outcomes of this project will be transferred to a broad audience of Indian reservations in Nebraska and to high-school students and teachers through a summer workshop program. New educational material will be incorporated in courses offered to engineering undergraduate and graduate students at the participating universities.

这项合作研究的目的是在实验和理论上量化的结构弹性的一种新的纤维增强土砌体系统的住宅在大风地区。这一目标将通过工程和原型设计稳定的土块和砂浆来实现，两者都通过添加天然纤维来增强，并通过物理测试来验证全尺寸墙壁的结构响应。 砂浆和砌块的工程设计将基于两个标准：稳定剂和纤维量的优化，以及砌块和砂浆的相容性，其中目标强度被定义为在砂浆接缝中强制失效。墙系统的工程设计将基于适用的面内和面外力之间的相互作用规律的制定和验证。 相互作用的法律将根据本构模型获得的材料和缩放的特性。这项合作涉及南卡罗来纳州大学、内布拉斯加大学林肯分校和佛罗里达大学的教师，每个机构有一名博士生。 砌块和砂浆的工程和表征将分别由佛罗里达大学和内布拉斯加州林肯大学领导。 包括分析和实验验证在内的墙的工程将由哥伦比亚的南卡罗来纳州大学领导。其结果将是一个原型块和砂浆组合。 对选定系统的验证将以全尺寸墙壁样品在面内、面外和摆锤冲击载荷下的验证试验为基础，这些载荷模拟典型的造成人员伤亡的飞行碎片的冲击能量。 拟议的研究将通过设计砂浆和砌块来提高损伤容限，并通过基于全尺寸实验的结构系统和预测分析模型的验证来推进知识和技术。 该项目的最终成果将是一个新颖的、负担得起的、节能的、适合当地的农村住宅系统，该系统旨在承受强风荷载，例如美国中西部和东南部的风荷载。 该项目的成果将通过一个夏季讲习班方案，传播给内布拉斯加州印第安人保留地的广大受众以及高中学生和教师。 新的教材将纳入参与大学为工程本科生和研究生开设的课程。