A Design Methodology for Architectural Glazing Systems to Resist Windborne Debris Impacts

9628807 Behr在最近的极端风事件中，建筑围护结构的脆弱性得到了充分的证明，这些事件导致了建筑内部的破坏，建筑功能的丧失和巨大的更换/维修成本。夹层玻璃单元在玻璃系统中显示出巨大的潜力，可以抵抗风传播的碎片冲击。将开发一种基于计算机的设计方法，以预测给定夹层玻璃单元在以规定速度飞行的设计导弹撞击下内部玻璃层破裂的概率。为了实现这一目标，将开发一个基于结构力学的基于聚乙烯醇丁醛夹层玻璃单元的预测模型，并通过综合实验室测试进行验证。项目交付成果将包括一个计算机化的设计包，可用于设计和开发具有成本效益的玻璃系统，该系统具有“牺牲层行为”，即外层玻璃层可能破裂，或“牺牲”风载碎片的冲击，但夹层/内部玻璃层复合材料具有足够的弹性，可以保护内部玻璃层免受破裂。因此，在风暴期间，建筑围护结构的完整性得以保存。这个项目将包括一个由土木工程师、机械工程师和统计学家组成的团队。项目结果将为研究界提供所需的数据，将对减轻严重风暴造成的建筑围护结构损坏产生重大的积极影响，并将使美国的建筑业主和建筑保险公司受益。

9628807 Behr The vulnerability of building envelopes have been amply demonstrated during recent extreme wind events which resulted in damage to building interiors, loss of building functions and great replacement/repair costs. Laminated glass units have shown significant promise for glazing systems that resist windborne debris impacts. A computer-based design methodology will be developed to predict the probability of an inner glass ply fracture in a given laminated glass unit under impacts from a design missile traveling at a prescribed speed. To accomplish this, a robust structural mechanics-based predictive model for laminated glass units with polyvinyl butyral interlayers will be developed and verified by means of comprehensive laboratory tests. Project deliverables will include a computerized design package that can be used to design and develop cost-effective glazing systems that exhibit "sacrificial ply behavior," i.e., the outer glass ply may be fractured, or "sacrificed" to windborne debris impacts, but the interlayer/inner glass ply composite is sufficiently resilient to protect the inner glass ply from fracturing. Thus, the integrity of the building envelop is preserved during the windstorm. This project will involve a team of civil engineers, mechanical engineers and statisticians. Project results will provide the research community with needed data, will have a significant positive impact on mitigating building envelope damage due to severe windstorms, and will benefit building owners and building insurers in the United States.