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

结构系统的最新进展，加上高性能材料的广泛使用，使得结构变得越来越高，越来越纤细。因此，这些结构非常容易受到极端载荷引起的大振动的影响，特别是那些由地震或风力事件引起的振动。这可能导致重大的经济影响，因为在建筑物重新使用之前需要进行大量维修。为了增加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，本研究将评估策略性放置非传统土木工程材料以减少结构振动的能力。具体来说，高能量耗散材料，如碳和聚合物泡沫，将被放置在结构构件经常未充分利用的空隙中，并受到大规模振动台加载来模拟地震载荷。实验测试将辅以数值模型，以便考虑到高能量耗散材料的不同水平和位置，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。他在钢铁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钢结构系统在极端载荷下的结构响应。具体来说，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程度地减少结构响应。为了提高结构的稳健性和弹性，必须尽量减少极端事件后造成的永久性损伤。为此，将利用现有的钢矩框架设置和振动台来模拟地震地面运动的影响。响应时间历史（位移、加速度）和局部损伤将用于评估有无附加阻尼系统的钢框架的性能。利用数值模型的重要参数研究将增强实验测试，两项调查的结果将用于开发使用非传统材料作为提供可定制分布式阻尼的手段的建议。该奖项由美国国家科学基金会和日本科学促进会共同资助，隶属于东亚和太平洋暑期研究所项目，支持一名美国研究生进行暑期研究。

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.