CAREER: Innovative Structural Systems for Multi-hazard Resistance Using Steel Plate with Cutouts

职业：使用带切口的钢板来抵抗多种危险的创新结构系统

• 批准号: 1453960
• 负责人: Matthew Eatherton
• 金额: $ 50万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-01 至 2021-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1453960&HistoricalAwards=false
• 关键词: CAREER; Innovative; Structural; Systems; Multi

This Faculty Early Career Development (CAREER) Program grant will pursue research to create new enhanced structural systems by strategically removing material (i.e. introducing engineered cutouts) in constituent steel plates. Structural systems subjected to extreme lateral loads due to earthquake or wind resist collapse when they can sustain large deformation without breaking. This property, known as ductility, protects the lives of inhabitants because buildings can deform without collapsing. Typical structural systems that rely on shear deformations in steel plates to develop ductility are challenged by shear buckling and the potential for fracture. This research attempts to revolutionize structural systems that rely on ductile shear deformations. The innovative approach is to improve ductility and energy dissipation ability by strategically removing material from the plates rather than adding more material. This project will develop cutout patterns, and the underlying science, to convert shear deformations into smaller ductile mechanisms that resist buckling. The new structural systems have the potential to improve the performance of the built environment when subjected to extreme lateral loads.The project's approach involves converting global shear deformations into local ductile yielding mechanisms in a way that can resist buckling, develop increased stiffness, exhibit stable and full hysteretic behavior, and allow structural behavior to be tuned. The computational and experimental studies will lead to a new understanding of the mechanics of ring-shaped and yielding link hysteretic elements. Fundamental knowledge about approaches for creating ductile shear behavior will be discovered by 1) computationally exploring size, shape, and layout of cutouts for buckling resistant mechanisms, 2) developing methods to tune behavior, 3) validating concepts through small- and large-scale experiments, and 4) structural system level modeling. A related educational plan will inject visual demonstrations and hands-on activities into structural engineering curricula by 1) conducting and videotaping hands-on activities for K-12 outreach, 2) creating well-produced videos of the outreach activities, experiments, and key demonstrations, and then 3) creating an online warehouse for videos and instructions related to structural engineering.

学院早期职业发展(Career)计划拨款将通过战略性地去除组成钢板中的材料(即引入工程切割)来进行研究，以创建新的增强型结构系统。结构体系在地震或风的作用下承受极大的横向荷载，当它们能够承受大变形而不破裂时，它们就能抵抗倒塌。这种被称为延展性的特性保护了居民的生命，因为建筑物可以变形而不会倒塌。依赖钢板剪切变形来发展延性的典型结构体系受到剪切屈曲和断裂可能性的挑战。这项研究试图彻底改变依赖韧性剪切变形的结构体系。创新的方法是通过有策略地从板材中移除材料而不是添加更多材料来提高延性和能量耗散能力。这个项目将开发切割模式和基本科学，将剪切变形转换为更小的抗屈曲的延性机制。新的结构体系有可能改善建筑环境在承受极端水平荷载时的性能。该项目的方法包括将整体剪切变形转换为局部延性屈服机制，以防止屈曲，增加刚度，表现出稳定和完全的滞回行为，并允许结构行为进行调整。计算和试验研究将使人们对环型和屈服连杆滞回构件的力学有一个新的认识。关于创建延性剪切行为的方法的基本知识将通过1)通过计算探索抗屈曲机构的开口的大小、形状和布局，2)开发调整行为的方法，3)通过小规模和大型试验验证概念，以及4)结构系统级建模来发现。相关的教育计划将通过以下方式将视觉演示和实践活动注入结构工程课程：1)进行K-12外展的实践活动并进行录像，2)制作外展活动、实验和关键演示的制作良好的视频，然后3)创建与结构工程相关的视频和说明的在线仓库。