Using Viscoelastic Material to Reduce the Dynamic Response of Woodframe Structures

摘要本研究的目的是开发一种先进的面板系统，以改善木框架结构的抗震性能，使用粘弹性（VE）阻尼材料的薄层板。VE将被集成到墙框架和覆层和/或饰面材料之间的结构材料的横向负载抵抗系统中。预计最终的面板系统将使用很少或不使用紧固件来将覆板和干墙连接到立柱框架，并在显著节省成本的情况下提供增加的耐久性。VE材料是自粘性的，并在卷（类似于磁带）。 这种材料很容易获得，非常灵活，易于应用，并且可以分层。 一个初步的全面测试的结果，一个薄层（0.005”）的材料应用到墙上显示，显着的改善，可以实现不影响整体的墙壁尺寸。 粘弹性板材的创新应用可能会对木框架结构的设计、施工和修复产生深远的影响。 本研究计划将测试及评估黏弹性材料在木结构住宅中的应用，以改善木结构的抗震性能及耐久性。 提出了一个实验方案，以评估VE材料在连接/组件水平上应用于木框架结构。 将使用非线性有限元模型进行参数研究，以优化壁内VE材料的放置。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壁的行为。将在有和没有干墙的传统墙壁上进行基准全尺寸测试（静态和循环）。 根据连接和分析工作，将确定最佳设计，并在有和没有干墙的墙壁上进行全尺寸墙壁测试，并与分析结果进行比较。这项研究提出了减少生命，伤害和财产破坏的风险，并通过开发一个国家的最先进的剪力墙面板系统，提高耐久性。木框架结构在中到大地震期间继续经历重大的结构和非结构破坏。在许多情况下，建筑物在灾难发生后可能仍然屹立不倒，只是由于严重的非结构性破坏，使住宅无法居住。仅仅具有高延展性已经不再令人满意;今天的结构必须经过工程设计，以实现更好的性能，并确保不仅仅是生命安全。增加结构的主要横向负载抵抗系统的能量耗散能力将显著降低地震事件期间的生命损失、伤害和非结构性损坏的风险。提出的概念利用现有材料并将其融入结构中，以不破坏木框架剪力墙的设计并简化施工过程。

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.