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

这项研究的目的是开发一种采用坚固的结构脊梁和阻尼销节点的多危险弹性结构体系。在第一年，提出了两种类型的阻尼销节点，以提高典型的强脊结构和常规弯矩框架结构的弹性。通过循环加载试验和有限元分析，明确了阻尼销接头的结构特点。这种节点可应用于强脊梁结构的集电端，也可应用于弯矩框架结构的梁柱节点。其中一个节点使用杠杆臂构件，将阻尼器放置在竖向结构构件中，而不是水平构件中，从而增强了阻尼器布置的灵活性。另一种方案是引入双级屈服阻尼器，实现结构的多级振动控制。在理论分析的基础上，提出了两种阻尼节点的刚度和强度评估方法。通过循环加载试验和计算机模拟验证了所提出节点和评估方法的可行性。通过对建筑物模型在不同地震动输入下的地震反应分析，验证了双层屈服阻尼器的有效性。此外，通过数值分析，探讨了减小强脊结构柱基损伤的两种解决方案，即增加结构的第一层高度和提高结构脊柱的销底位置。

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.