Collaborative Research: Multi-Hazard Response Mitigation Systems Using High Strength and Damping Capacity Shape Memory Alloys

合作研究：使用高强度和阻尼能力形状记忆合金的多灾害响应缓解系统

• 批准号: 1538665
• 负责人: Haluk Karaca
• 金额: $ 14.7万
• 依托单位: University of Kentucky Research Foundation
• 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: 2015-10-01 至 2018-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1538665&HistoricalAwards=false
• 关键词: Collaborative; Research; Multi; Hazard; Response

Designing structures to withstand dynamic natural hazards such as earthquakes, strong winds, and hurricanes is of primary concern for civil engineers. Recent advances in architectural forms, structural systems, and high performance materials have enabled the design of very slender and lightweight structures. These flexible structures are susceptible to high levels of vibrations under strong winds and earthquakes, which may lead to structural damage and potential failure. This research project will explore the design and characterization of high performance smart alloys in multi-hazard response mitigation systems. The use of smart alloys in a novel passive control device will provide enhanced dynamic performance of buildings under various hazards of varying magnitudes. This will lead to reductions in disaster losses and in social and economic disruptions associated with future natural hazard events. With its interdisciplinary nature, this research will be closely integrated with educational plans to foster a natural process of learning and discovery. The research objective of this project is to design, fabricate and characterize superelastic shape memory alloys with high strength and damping capacity to mitigate damage and enhance post-event functionality of mid-rise to tall steel buildings subjected to multiple hazards by implementing a novel passive structural control device. Using the Nickel-Titanium-Hafnium-Palladium (NiTiHfPd) alloys that have very high strength, high dissipation/damping capacity, good cyclic stability, and a wide operating temperature range, a shape memory alloy-based re-centering damper (SMARD) will be investigated to provide damping and re-centering capabilities to buildings subjected to wind and earthquake excitations. The advantageous characteristics of the SMARD device include large and scalable force capacity, excellent re-centering ability, high damping capacity, passive nature, ability to withstand multiple levels of hazards, and need for no special maintenance or replacement through the life-cycle. The research activities include the following: (1) characterize the shape memory behavior of heat treated NiTiHfPd alloys to establish the microstructure-property relationship, (2) tailor the microstructure to obtain high strength (greater than 1.5 gigapascal) and damping capacity (greater than 30 Joules per cubic centimeter) NiTiHfPd alloys that can operate between minus 20 degrees Celsius to plus 50 degrees Celsius with stable cyclic behavior, (3) examine cyclic response of selected alloys, (4) design and fabricate a prototype of a SMARD with a force capacity of 500 kilonewtons and stroke of 300 millimeters, and (5) characterize and model the dynamic behavior of the device.

设计结构以抵御地震、强风和飓风等动态自然灾害是土木工程师主要关心的问题。建筑形式、结构系统和高性能材料方面的最新进展使非常细长和轻便的结构设计成为可能。这些柔性结构在强风和地震作用下容易受到高水平振动的影响，这可能会导致结构损坏和潜在的破坏。这项研究项目将探索多危险响应缓解系统中高性能智能合金的设计和表征。在一种新型被动控制装置中使用智能合金将增强建筑物在各种不同程度的危险下的动态性能。这将导致减少灾害损失以及与未来自然灾害事件相关的社会和经济破坏。由于其跨学科性质，这项研究将与教育计划紧密结合，以促进自然的学习和发现过程。本项目的研究目标是设计、制造和表征具有高强度和减震能力的超弹性形状记忆合金，以通过实施一种新型的被动结构控制装置来减轻中高层到高层钢结构建筑的损伤并增强其事后功能。利用镍钛汞钯(NiTiHfPd)合金具有很高的强度、高的耗散/阻尼能力、良好的循环稳定性和较宽的工作温度范围，将研究一种基于形状记忆合金的重新定心阻尼器(SMARD)，以提供建筑物在风和地震激励下的减振和重新定心能力。SMARD装置的优势特征包括：大且可扩展的力容量、出色的重新定心能力、高阻尼性、被动性、能够承受多种级别的危险，并且在整个生命周期中不需要特殊维护或更换。研究活动包括如下：(1)表征热处理NiTiHfPd合金的形状记忆行为，以建立微观结构-性能关系；(2)调整微观结构以获得高强度(大于1.5千兆帕斯卡)和高阻尼能力(大于30焦耳/立方厘米)；(3)表征和模拟器件的动态行为；(3)检测选定合金的循环响应；(4)设计和制造一个力容量为500千牛顿、行程为300毫米的SMARD原型，以及(5)表征和模拟装置的动态行为。