US-Japan Planning Visit for Complementary Experimental Programs Toward Validated Advanced Damping Systems

这项计划拨款将在美国和日本研究人员之间建立互补的实验项目，以借鉴2011年东日本大地震的教训，改善减轻地震损害的工作。这次地震产生了有史以来最具破坏性的长周期地面运动。这些运动导致以前被认为是安全的结构发生了巨大的位移，包括高层建筑和基础隔离结构。PI将与东北大学的Kohju Ikago博士合作，利用PI在实时混合仿真（RTHS）领域的实验专业知识和Ikago实验室的结构控制设备的进步。该合作将研究新的补充控制装置和控制算法，并使用振动台和RHTS进行实验评估。规划访问将为开发和验证新设备打开大门，这些设备可以抵御更大范围的地面运动，改进民用基础设施的抗震设计，提高在更大范围地震下的弹性。两名美国学生也将在该资助下接受培训。半主动装置在减轻地面运动对结构的破坏方面具有很大的潜力；它们不会破坏结构系统的稳定，提供与无源器件相似的耐用性，并且可以适应大范围的输入特性。对新型半主动控制系统的研究将结合振动台和RTHS的实验测试。RTHS提供了一种经济有效的工具，通过易于切换的数值子结构来探索各种结构配置。然而，在进行长时间/长时间的地面运动时，必须考虑到新的考虑因素。此外，振动台测试因其简单而被广泛接受，而RTHS是一种相对较新的实验测试框架，在被工程界和工业界接受之前需要进行广泛的验证。RTHS将受益于与振动台研究并行的严格基准测试。通过这种伙伴关系，结构控制装置和控制算法将被重新设想，以适应广泛的地面运动。拟进行的研究将包括在东北大学观察和参与小型结构控制装置的振动台实验，小型装置的RTHS（与振动台试验中探索的装置相同），以及在马里兰建立长期工作协议和纳入测试和开发的计划。研究团体的能力将通过硬件、软件和算法开发得到增强。此次规划访问预计将导致更长期的合作，以开发(1)足够强大的控制算法，以包括长周期/长持续的地面运动；(2)针对广泛的地面运动特性的新设备；(3)新的RTHS功能；(4)提高对如何减轻长周期/长持续的地面运动对高层和基础隔离结构的损害的理解。

This planning grant will establish complementary experimental programs between US and Japanese researchers to improve seismic damage mitigation in light of lessons of the 2011 Great East Japan Earthquake. This earthquake produced the most devastating long-period/long-duration ground motions ever recorded. These motions led to large displacements in structures previously thought to be safe, including high-rise buildings and base-isolated structures. A collaboration will be developed between the PI and Dr. Kohju Ikago of Tohoku University, taking advantage of the experimental expertise of PI in the area of real-time hybrid simulation (RTHS) and the structural control device advances of the Ikago Lab. The collaboration will investigate new supplemental control devices and control algorithms, experimentally evaluated using both shake tables and RHTS. The planning visit will open the door to the development and validation of new devices that are robust to wider range of ground motions, improving the seismic design of civil infrastructure and increasing resiliency under a broader class of earthquakes. Two US students will also receive training under the grant.Semi-active devices have great potential in mitigating structural damage from ground motion; they cannot destabilize the structural system, offer similar durability as passive devices, and can adapt to a wide range of input characteristics. This investigation into new semi-active control systems will be coupled with experimental testing using both shake tables and RTHS. RTHS offers a cost-effective tool to explore a wide variety of structural configurations through easily swappable numerical substructures. However, new considerations must be taken into account before RTHS can be used for the proposed long-period/long-duration ground motions. Also, shake table tests are widely accepted due to their simplicity while RTHS is a relatively new experimental testing framework that requires extensive validation before it is accepted by the engineering community and industry. RTHS will benefit from rigorous benchmarking in parallel with shake table studies. Through this partnership, structural control devices and control algorithms will be re-envisioned to accommodate a wide range of ground motions. The proposed research will include observing and participating in shake table experiments on small-scale structural control devices at Tohoku University, RTHS of small-scale devices (the same devices as explored in shake table testing), and establishing long-term working agreements and plans for incorporating testing and development at Maryland. The capacity of the research community will be enhanced by hardware, software, and algorithm development. The planning visit is expected to lead to a longer term collaboration to develop (1) control algorithms robust enough to include long-period/long-duration ground motion, (2) new devices aimed at a broad array of ground motion characteristics, (3) new RTHS capabilities, and (4) improved understanding of how to mitigate damage to high-rise and base-isolated structures from long-period/long-duration ground motion.