EAPSI: Numerical and Experimental Investigations of Supplemental Distributed Damping for Seismic Energy Dissipation

EAPSI：地震能量耗散补充分布式阻尼的数值和实验研究

• 批准号: 1713850
• 负责人: Malcolm Ammons
• 金额: $ 0.54万
• 依托单位: Ammons Malcolm L
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-06-01 至 2018-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1713850&HistoricalAwards=false
• 关键词: EAPSI; Numerical; Experimental; Investigations; Supplemental

Recent advances in structural systems in conjunction with the proliferation of the use of high performance materials have allowed for structures to become taller and increasingly slender. As such, these structures are highly susceptible to large vibrations induced by extreme loads, particularly those caused by earthquakes or wind events. This can lead to significant economic impact as a result of extensive repairs that are required prior to building re-occupancy. In order to increase the post-event functionality of midrise to super-tall steel structures and better control the structural response and location of damage, this research will assess the ability of strategically placed non-traditional civil engineering materials to reduce structural vibrations. Specifically, high energy dissipating materials such as carbon and polymer foams will be placed within the often underutilized voids of structural members and subjected to large-scale shake table loading to simulate seismic loads. Experimental testing will be supplemented by numerical models that will allow for the assessment of building displacements and accelerations considering different levels and location of the high energy dissipating materials. This research will be conducted at Kyoto University under the guidance of Associate Professor Masahiro Kurata. His expertise in large scale and numerical testing of steel systems, coupled with the facilities of Kyoto University, make Japan an ideal location to conduct this research.The overarching goal of this project is to mitigate the structural response of steel systems under extreme loads. Specifically, the main objectives are to assess the ability of non-traditional civil engineering materials to provide damping under seismic loading and determine what levels and location of this supplemental damping will provide the greatest reduction in structural response. In order to enhance the robustness and resilience of structures, the amount of permanent damage incurred after an extreme event must be minimized. To this end, an existing steel moment frame setup will be utilized with a shake table to simulate the effects of seismic ground motion. Response time histories (displacement, acceleration) and localized damage will be used to assess the performance of the steel frame with and without the supplemental damping system. A significant parametric study utilizing numerical models will augment the experimental testing, and results from both investigations will be used to develop recommendations for the use of non-traditional materials as a means to provide customizable distributed damping.This award, under the East Asia and Pacific Summer Institutes program, supports summer research by a U.S. graduate student and is jointly funded by NSF and the Japan Society for the Promotion of Science.

结构系统的最新进展与高性能材料的使用的激增相结合，使得结构变得更高并且越来越细长。因此，这些结构非常容易受到由极端载荷引起的大振动的影响，特别是由地震或风力事件引起的大振动。由于在重新使用建筑物之前需要进行大规模维修，这可能导致重大的经济影响。为了提高中高层到超高层钢结构的事后功能，更好地控制结构响应和损伤位置，本研究将评估战略性放置的非传统土木工程材料减少结构振动的能力。具体而言，高耗能材料，如碳和聚合物泡沫将被放置在结构构件的通常未充分利用的空隙内，并经受大规模振动台载荷以模拟地震载荷。实验测试将通过数值模型进行补充，这些模型将考虑到高耗能材料的不同水平和位置，从而评估建筑物的位移和加速度。这项研究将在京都大学的仓田正弘副教授的指导下进行。他在钢结构系统的大规模和数值测试方面的专业知识，加上京都大学的设施，使日本成为进行这项研究的理想地点。该项目的总体目标是减轻极端荷载下钢结构系统的结构响应。具体而言，主要目标是评估非传统土木工程材料在地震荷载下提供阻尼的能力，并确定这种补充阻尼的水平和位置将最大限度地减少结构响应。为了增强结构的坚固性和弹性，必须尽量减少极端事件后造成的永久性损坏。为此，将利用现有的钢框架装置和振动台来模拟地震地面运动的影响。响应时间历程（位移，加速度）和局部损伤将被用来评估钢框架的性能与没有补充阻尼系统。利用数值模型进行的重要参数研究将增强实验测试，两项调查的结果将用于制定使用非传统材料的建议，以提供可定制的分布式阻尼。该奖项根据东亚和太平洋夏季研究所计划，支持美国研究生的夏季研究，由NSF和日本科学促进会共同资助。