Multi-hazard resilient structural system adopting strong structural spines and damped-pin joints

本研究旨在发展一种多灾害弹性结构体系，采用强结构脊和阻尼销节点。在第一年，提出了两种类型的阻尼销节点，以提高典型的强脊柱结构以及规则的力矩框架结构的恢复力。通过低周反复加载试验和有限元分析，阐明了阻尼销节点的结构特点。这些阻尼销节点可应用于强柱结构的集电端和框架结构的梁柱节点。其中一种节点采用悬臂构件将阻尼器放置在竖向构件而不是水平构件上，从而提高了阻尼器布置的灵活性。另一种方案是采用双级屈服阻尼器实现结构的多级振动控制。在理论分析的基础上，提出了两种阻尼连接的刚度和强度评价方法。通过循环加载试验和计算机仿真，验证了所提出节点和评价方法的可行性。通过对不同地震动输入下的建筑模型的地震反应分析，验证了双级屈服阻尼器的有效性。此外，通过数值分析，探讨了提高结构底层高度和提高结构柱销座位置两种减小强脊结构柱脚损伤的方法。

This research aims to develop a multi-hazard resilient structural system adopting strong structural spines and damped-pin joints. In the first year, two types of damped-pin joints were proposed to enhance resilience of typical strong-spine structures as well as regular moment frame structures. The structural characteristics of the damped-pin joints were clarified through cyclic loading tests and finite element analysis. Those damped-pin joints can be applied at the collector ends in the strong-spine structures and beam-to-column connections in moment frame structures. One of the proposed joints uses lever-arm members to place dampers in the vertical structural members rather than the horizontal members, which enhances the flexibility of damper arrangements. The other proposal introduces double-stage yield dampers to realize multi-stage vibration control of the structure. Stiffness and strength evaluation methods for the two types of damped joints were developed based on theoretical analysis. Feasibility of the proposed joints and the evaluation methods were verified by cyclic loading tests and computer simulation. Efficiency of the double-stage yield dampers were also verified by seismic response analysis of building models under various ground motion inputs. Additionally, two solutions to reduce column base damage in the strong-spine structures have been discussed through numerical analyses, which are increasing the first-story height and raising the pin base location of the structural spines.