Abstract

Using seesaw structural system in buildings is a way for creating earthquake-resilient buildings, namely buildings which can be easily and quickly repaired with little cost, even after major earthquakes. To create such a system, all internal columns at the lowest story are removed and instead, a central mega support is used, combined with a grid of orthogonal strong girders as the first floor, and all circumferential columns at the lowest story are equipped with energy dissipaters at their bottoms. In this article, after presenting a simplified dynamical model for seesaw buildings, to create the analytical base for proposing the preliminary design rules for this type of buildings, the proposed rules have been developed and supported by conducting several non-linear time history analyses (NLTHA) cases on a set of regular steel buildings with concentric bracings, having 3, 5, 7 and 9 stories with different number of bays, and various bay sizes. NLTHA results indicate that the immediate occupancy performance level is mostly achieved in the designed seesaw buildings. The efficiency of this system in low-rise buildings is more than mid-rise ones. Although seesaw buildings respond relatively well to both near- and far-field events, they behave less effectively in near-field pulse-like earthquakes.

摘要

在建筑物中使用跷跷板结构系统是一种建造抗震建筑物的方法，即即使在大地震之后也可以轻松快速地以较低成本修复的建筑物。为了创建这样一个系统，最底层的所有内部柱子都被拆除，取而代之的是一个中央巨型支撑，结合正交强梁的网格作为一楼，最低层的所有圆周柱都配备了能量消散器在他们的底部。本文在介绍了跷跷板式建筑的简​​化动力模型后，为提出此类建筑的初步设计规则奠定了分析基础，提议的规则已经通过对一组具有同心支撑的常规钢结构建筑进行多个非线性时程分析 (NLTHA) 案例来制定和支持，这些建筑有 3、5、7 和 9 层，具有不同数量的开间，以及各种开间尺寸。NLTHA 结果表明，在设计的跷跷板建筑中，即时入住性能水平大多达到。该系统在低层建筑中的效率高于中层建筑。尽管跷跷板式建筑物对近场和远场事件的反应都相对较好，但它们在近场脉冲类地震中的表现较差。该系统在低层建筑中的效率高于中层建筑。尽管跷跷板式建筑物对近场和远场事件的反应都相对较好，但它们在近场脉冲类地震中的表现较差。该系统在低层建筑中的效率高于中层建筑。尽管跷跷板式建筑物对近场和远场事件的反应都相对较好，但它们在近场脉冲类地震中的表现较差。