Using Viscoelastic Material to Reduce the Dynamic Response of Woodframe Structures

使用粘弹性材料降低木框架结构的动态响应

• 批准号: 0229724
• 负责人: David Dinehart
• 金额: $ 22.5万
• 依托单位: Villanova University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-06-01 至 2007-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0229724&HistoricalAwards=false
• 关键词: Using; Viscoelastic; Material; Reduce; Dynamic

Abstract The objective of the proposed research is to develop an advanced panel system for improving the seismic performance of wood frame structures using thin laminates of viscoelastic (VE) damping materials. The VE will be integrated into the lateral load resisting system of the structure material between the wall frame and the sheathing and/or finishing material. It is anticipated that the final panel system will utilize little to no fasteners to connect the sheathing and drywall to the stud frame and provide increased durability at significant cost savings. VE material is self-adhesive and comes in rolls (similar to tape). The material is readily available, very flexible, easy to apply, and can be layered. The results of one preliminary full-scale test of one thin layer (0.005") of the material applied to a wall show that significant improvements can be realized without affecting the overall wall dimensions. Innovative applications of viscoelastic sheet material may potentially have a profound impact on the design, construction and rehabilitation of wood frame structures. The proposed research program will test and evaluate the application of viscoelastic material in wood frame structures, typical of residential housing, for improving the seismic performance and durability of the structure. An experimental program has been proposed to evaluate the application of VE material to wood frame construction at the connection/component level. A non-linear finite element model will be used to conduct parametric studies to optimize the placement of the VE material within the wall. The model can account for the supplemental damping and stiffness of the VE material and will be used to predict the full-scale wall behavior. Baseline full-scale tests (static and cyclic) will be conducted on conventional walls with and without drywall. Based on the connection and analytical work, an optimal design will be determined and full-scale wall tests will be conducted on walls with and without drywall and compared to the analytical results. The research proposed reduces the risk of life, injury, and property destruction and improves durability by developing a state-of-the-art shearwall panel system. Wood frame structures continue to experience significant structural and non-structural damage during moderate to large earthquakes. In many cases the structure may remain standing after the disaster, only for there to be serious non-structural damage that renders the residence uninhabitable. Having just high ductility is no longer satisfactory; today's structures must be engineered and designed to perform better and to insure more than just life safety. Increasing the energy dissipation capacity of the primary lateral load resisting system of the structure would significantly reduce the risk to loss of life, injury and non-structural damage during seismic events. The concept proposed makes use of existing materials and incorporates them into the structure in such as way as to not disrupt the design of the wood frame shear wall and simplifies the construction process.

摘要本研究的目的是开发一种先进的板系统，用于使用粘弹性（VE）阻尼材料的薄层板来提高木结构的抗震性能。VE将集成到墙框架与护套和/或饰面材料之间的结构材料的横向抗荷载系统中。预计最终的面板系统将使用很少甚至不使用紧固件将护套和干墙连接到螺柱框架，并在显著节省成本的情况下提供更高的耐久性。VE材料是自粘的，成卷（类似于胶带）。这种材料很容易获得，非常灵活，易于应用，并且可以分层。将一薄层（0.005”）材料应用于墙壁的初步全尺寸测试结果表明，可以在不影响整体墙壁尺寸的情况下实现显着改善。粘弹性板材料的创新应用可能对木结构的设计、建造和修复产生深远的影响。拟议的研究计划将测试和评估粘弹性材料在木结构（典型的住宅）中的应用，以提高结构的抗震性能和耐久性。提出了一个实验程序来评估VE材料在木结构连接/组件水平上的应用。将使用非线性有限元模型进行参数研究，以优化VE材料在墙内的放置。该模型可以解释VE材料的附加阻尼和刚度，并将用于预测全尺寸墙体的行为。基线全尺寸测试（静态和循环）将在有和没有干墙的传统墙壁上进行。根据连接和分析工作，确定最佳设计，并对有和没有干墙的墙壁进行全尺寸墙壁试验，并与分析结果进行比较。该研究建议通过开发最先进的剪力墙板系统来降低生命、伤害和财产破坏的风险，并提高耐久性。在中到大地震中，木结构继续遭受重大的结构和非结构破坏。在许多情况下，灾后结构可能仍然屹立不倒，只是因为有严重的非结构性损坏，使住宅无法居住。仅仅拥有高延展性已不再令人满意；今天的建筑结构必须设计得更好，确保的不仅仅是生命安全。提高结构主侧抗荷载体系的消能能力，将显著降低地震事件中结构的人员伤亡和非结构破坏风险。提出的概念是利用现有的材料，并将它们融入到结构中，这样就不会破坏木框架剪力墙的设计，并简化了施工过程。