Resilient Steel Frame Systems through the Use of Non-Traditional Materials

该项目旨在通过将非传统土木工程材料融入钢结构系统，提高钢框架系统在地震荷载下的性能。钢框架系统的当前设计方法依赖于特定位置的钢构件的损伤来耗散能量。在钢结构系统中使用非传统土木工程材料，如泡沫钢和蜂窝材料作为填充物，是显著降低地震对结构影响的重要手段。这些非传统材料的使用为更好地控制结构响应以及损坏的数量和位置提供了机会。因此，在极端事件发生后，修复结构和非结构损坏的必要性最小化，并保持社区的经济完整性。这种解决方案对于新建筑和旧钢框架系统的改造都是合理的。这项工作将为结构设计中更广泛地使用和整合创新材料提供路线图。目前，钢框架系统通过特定构件中的“熔断器”或“塑性铰链”的非弹性行为来耗散地震输入能量，从而限制了可用于这些构件的截面，并导致重大损坏和维修停机时间。该项目的具体目标是通过在宽翼缘截面的翼缘和中空结构截面的内部之间采用非传统材料（高阻尼橡胶、金属和聚合物泡沫以及蜂窝材料）来增加能量耗散并抑制局部屈曲，从而增强抗震钢框架系统的回弹性和鲁棒性。为了实现这一目标，高阻尼材料的行为将在大的动态循环载荷下进行表征。 将对非传统土木工程材料进行力学性能测试，小规模构件测试将考虑其在有限填充应用中的行为。有限元模型将被用来评估不同的属性和配置的性能和耗能能力的空心填充构件的效果。将对使用填充材料的梁柱连接和支撑构件的大型子组件进行实验测试，以确定详细要求并验证屈曲缓解。非传统土木工程材料，结构工程和地震的融合也提供了一个机会，以激励下一代学生对工程;给大学生留下深刻的印象，需要创造性地思考;并教育结构工程从业人员关于非传统材料及其对结构的可能影响。

This project aims to enhance the performance of steel frame systems under seismic loads by incorporating non-traditional civil engineering materials into steel structural systems. Current design approaches for steel frame systems rely on damage to steel members in specific locations to dissipate energy. The use of non-traditional civil engineering materials, such as steel foam and honeycomb materials as fill-in, in steel systems is an important means to significantly reduce the impact of an earthquake on a structure. The use of these non-traditional materials provides an opportunity to better control structural response and the amount and location of damage. As a result, the need to repair both structural and non-structural damage after an extreme event is minimized and the economic integrity of the community is maintained. Such solutions are plausible for both new construction and retrofit of older steel frame systems. This work will provide a road map for more extensive use and integration of innovative materials in the design of structures.Currently, steel frame systems dissipate earthquake input energy through inelastic behavior at 'fuses' or 'plastic hinges' in specified members limiting the sections that can be used for these members and leading to significant damage and downtime for repairs. The specific goal of this project is to enhance the resilience and robustness of seismic steel frame systems by employing non-traditional materials (high damping rubber, metal and polymer foams, and honeycomb materials) between the flanges of wide flange sections and the interior of hollow structural sections to increase energy dissipation and restrain local buckling. To achieve this goal, the behavior of the high damping materials will be characterized under large dynamic cyclic loads. Mechanical behavior tests will be conducted on the non-traditional civil engineering materials and small-scale member tests will consider their behavior in a confined fill application. Finite element models will be used to evaluate the effect of different properties and configurations on the behavior and energy dissipation capacity of the void-filled members. Large-scale sub-assemblies of beam-column connections and bracing members utilizing the fill materials will be experimentally tested to determine detailing requirements and verify buckling mitigation. The confluence of non-traditional civil engineering materials, structural engineering, and earthquakes also provides an opportunity to motivate the next generation of students towards engineering; impress upon university students the need to think creatively; and educate structural engineering practitioners about non-traditional materials and their possible impact in structures.