Investigation of adaptive prestressing for concrete structures

混凝土结构自适应预应力研究

• 批准号: 216876-2007
• 负责人: Newhook, John
• 金额: $ 1.42万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=424687
• 关键词: Investigation; adaptive; prestressing; concrete; structures

Current practice in the design and construction of civil infrastructure is to create 'passive' components and systems. The structural system is fixed at the time of initial construction and remains unchanged throughout the life of the structure unless purposeful intervention is taken. This project challenges the concept that our structures need to remain passive in the future. Through combining advances in materials and sensing technology, the concept of actively controlling and changing the structural system in response to changing loading conditions will be investigated. Specifically technology for adaptive prestressing of concrete beams will be developed. The beam will be constructed of concrete but will have an internal steel tendon which can be stressed to any desired level of tension in response to loads being applied to a beam. Using a biological analogy, the tendon will be similar to a muscle in the body; it will be relaxed when there is no load but will contract when load is present. The amount of contraction will change in response to the amount of load being applied. This concept active or adaptive control will revolutionize the way we conceive of and create future structural systems.

目前在民用基础设施的设计和施工中的做法是创建“被动”组件和系统。结构系统在最初建造时是固定的，除非采取有目的的干预措施，否则在结构的整个寿命期间保持不变。这个项目挑战了我们的结构需要在未来保持被动的概念。通过结合材料和传感技术的进步，将研究主动控制和改变结构系统以应对不断变化的载荷条件的概念。具体而言，将开发混凝土梁的自适应预应力技术。梁将由混凝土建造，但将具有内部钢筋束，该内部钢筋束可以响应于施加到梁上的载荷而被施加到任何期望的张力水平。使用生物学类比，肌腱将类似于身体中的肌肉;当没有负载时，它将放松，但当负载存在时，它将收缩。收缩的量将响应于所施加的负载的量而改变。这种主动或自适应控制的概念将彻底改变我们设想和创造未来结构系统的方式。