Continuously Graded Cementitious Material for Blast Protection of Structures

用于结构爆炸防护的连续级配胶凝材料

• 批准号: 0800307
• 负责人: Yiannis Andreopoulos
• 金额: --
• 依托单位: CUNY City College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-05-01 至 2012-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0800307&HistoricalAwards=false
• 关键词: Continuously; Graded; Cementitious; Material; Blast

Recent terrorist attacks in urban areas involving the use of explosives have exposed the vulnerability of buildings and other infrastructure to blasts. Structures directly in the path of the blast pressure wave are subjected to high-intensity and short-duration pressure loading. Because many important structures and facilities have been designed without considering such loads, developing and implementing blast mitigation strategies for existing buildings and other infrastructure, has become a critical priority. The central idea of this research is to study the concept of a protective system which provides dissipation to the energy of an incident blast pressure wave using geometric effects and irreversible compaction of material. A cementitious material, with continuously graded impedance (resistance) to the blast pressure wave propagation will be developed. It is proposed to engineer the material resistance to shock wave propagation to achieve optimum energy dissipation through geometric effects and irreversible compaction of the material. The outcome of the proposed research will form the basis for designing a cementitious material for use in blast mitigation strategies in practical applications. The work outlined in this proposal deals with three key issues: (a) experimental determination of the blast response of material; (b) numerical modeling of shock response of material; and (c) material production techniques for material with graded properties. The educational component is primarily focused on minority students. The research will benefit from the presence on the campus of many programs already in operation to enhance the participation of underrepresented groups in science and engineering.

最近在城市地区发生的涉及使用炸药的恐怖袭击暴露了建筑物和其他基础设施在爆炸面前的脆弱性。直接位于爆炸压力波路径上的结构物承受着高强度、短时间的压力荷载。由于许多重要的结构和设施在设计时没有考虑此类荷载，因此为现有建筑和其他基础设施制定和实施爆炸缓解策略已成为当务之急。这项研究的中心思想是研究一种保护系统的概念，该系统利用几何效应和材料的不可逆压实来为入射爆炸压力波的能量提供耗散。将开发一种对爆炸压力波传播具有连续梯度阻抗(阻力)的水泥基材料。提出了通过材料的几何效应和不可逆压实来设计材料的抗冲击波传播阻力，以达到最优的能量耗散。拟议的研究结果将成为设计用于实际应用中的爆炸缓解策略的胶凝材料的基础。本提案中概述的工作涉及三个关键问题：(A)材料爆炸响应的实验测定；(B)材料冲击响应的数值模拟；(C)具有分级性质的材料的材料生产技术。教育部分主要侧重于少数族裔学生。这项研究将受益于校园内许多已经在运作的项目，以加强未被充分代表的群体在科学和工程领域的参与。