Numerical Study of the Circumferential Fuses Used in Steel Repairable Buildings with Seesaw Motion

Abstract Structural fuses and rocking system are used in order to reduce the building response to earthquakes and damage guidance. In the proposed seesaw motion system, which is similar to the rocking system, the building columns, in top of the foundation, have been removed and a central support and structural fuses are used around the building instead of them. The main purpose of creating this system is that the structural components remain elastic during the earthquake and nonlinear deformations occur in circumferential structural fuses it means that, it is possible to replace damaged fuses after the earthquake and exploit the building in a short time and at a lower cost than the construction cost of the whole building. In this research, the specification of a kind of structural fuse have been investigated and its application in the building with a seesaw system is studied under the influence of the near-field earthquake. After reviewing the fuses, it was observed that, the maximum absolute acceleration of roof and the base shear are significantly reduced in this system; however, the relative drift of floors in some buildings has increased but is lower than the permitted limit.摘要：为降低建筑的地震响应并实现损伤引导，本研究采用结构保险丝（structural fuses）与摇摆体系（rocking system）。本研究提出的类同于摇摆体系的跷跷板运动系统（seesaw motion system），移除了基础顶面的建筑柱，转而在建筑周边设置中央支撑与结构保险丝。该体系的设计核心为，使结构主体构件在地震作用下保持弹性状态，而非线性变形集中发生于周向布置的结构保险丝中。这意味着震后仅需更换受损的保险丝即可快速恢复建筑使用，且整体恢复成本远低于整栋建筑的重建费用。本研究针对某款结构保险丝的性能参数展开了研究，并分析了其应用于跷跷板运动系统建筑时，在近场地震（near-field earthquake）作用下的响应特性。经分析可知，该体系可显著降低屋顶最大绝对加速度与基底剪力（base shear）；尽管部分楼层的层间相对位移（relative drift of floors）有所升高，但仍处于规范允许限值以内。