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Evaluation of critical separation distance to avoid seismic pounding between buildings: A spectral approach

机译：评估临界分离距离以避免建筑物之间的地震冲击：一种光谱方法

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摘要

Determining a minimum separation distance required to avoid seismic pounding between adjacent buildings is a capacity-demand design issue. This study developed a spectral approach to evaluate the expected minimum separation demand (referred to as the critical separation distance, [CSD]) to prevent pounding between buildings during strong earthquake motions. Presented firstly in this paper is an analytical procedure for evaluating the relative displacement process at the potential pounding location between two adjacent buildings during earthquake motions. The procedure is based on random vibration theory and modal analysis with application of the well-known CQC rule. Subsequently, an approximate nonlinear closed-form solution for evaluating CSD is derived, by means of a simplified spectral-based procedure with introducing the concept of equivalent linearization of nonlinear hysteretic behavior and the effective correlation coefficients of the generalized coordinates of equivalent linearized systems to consider inelastic vibration phase between buildings. Finally, the CSDs between two buildings having different heights and the same height for various combinations of buildings with different fundamental periods are separately examined as verification examples of the proposed approach. The accuracy of solution is demonstrated by comparing computed results with corresponding numerical results from nonlinear response history analyses (RHAs). The results show that the proposed approach provides a reliable solution in predicting the separation demand of buildings during earthquake motions.
机译：确定避免相邻建筑物之间的地震冲击所需的最小分离距离是一种容量需求设计问题。本研究开发了一种评估预期最小分离需求的光谱方法（称为临界分离距离，[CSD]），以防止在强烈地震运动期间建筑物之间的冲击。本文首先呈现，是一种分析过程，用于评估在地震运动期间两个相邻建筑物之间的潜在撞击位置处的相对位移过程。该程序基于随机振动理论和模态分析，应用了众所周知的CQC规则。随后，通过通过简化的基于光谱的过程导出用于评估CSD的近似非线性闭合溶液，其具有引入非线性滞后行为的等效线性化的概念以及等同的线性化系统的广义坐标的有效相关系数来考虑建筑物之间的无弹性振动阶段。最后，分别检查具有不同高度的两个建筑物和具有不同基本时段的各种建筑物的相同高度之间的CSD。通过将计算结果与来自非线性响应历史分析（RHAS）的相应数值结果进行比较来证明解决方案的准确性。结果表明，该方法提供了一种可靠的解决方案，可以在地震动作期间预测建筑物的分离需求。

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