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

9628807 Behr建筑物围护结构的脆弱性在最近的极端风力事件中得到了充分的证明，这些事件导致建筑物内部受损，建筑物功能丧失，以及巨大的更换/维修成本。 层压玻璃单元显示出抵抗风吹碎片影响的玻璃系统的重大前景。 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设计导弹以规定速度飞行的冲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预测模型，用于具有聚乙烯醇缩丁醛夹层的夹层玻璃单元，并通过全面的实验室测试进行验证。 项目交付物将包括一个计算机化的设计包，该设计包可用于设计和开发具有成本效益的玻璃窗系统，该系统表现出“牺牲层行为”，即，外玻璃层可能会被风吹碎片撞击而破裂或“牺牲”，但是夹层/内玻璃层复合材料具有足够的弹性以保护内玻璃层不破裂。 因此，在风暴期间保持了建筑围护结构的完整性。 该项目将涉及一个由土木工程师、机械工程师和统计学家组成的小组。 项目成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破坏产生重大积极影响，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.