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An engineering approach for evaluating the dynamic response of acceleration-sensitive secondary systems in flexible structures

机译：一种评估柔性结构加速敏感辅助系统动态响应的工程方法

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Secondary systems are nonstructural components that serve important functions within a structure, but are not considered as an integral part of the main structural system. There are many categories of secondary systems addressing architectural aspects, mechanical, electrical, communication, water supply and plumbing functions, as well as being part of the structure's content. The main issue regarding the installation of secondary systems in structures placed in seismically prone regions is preservation of their integrity and functionality during earthquake motions, since failure can have dramatic consequences in terms of property losses and safety concerns. This study introduces a new methodology for approximating the seismic response of acceleration-sensitive secondary systems with a mass lower than 1% of the total mass of the primary structure, and whose seismic excitation derives exclusively from the motion of that structure, that is, interaction phenomena are ignored. The methodology applies to secondary systems installed on regular and flexible primary structures exhibiting floor diaphragm action and quantifies the seismic demand from information based solely on the deflected shape of the structure at the instant it reaches peak seismic response. The methodology can be applied in alternative ways, depending on the required accuracy of the results and on acceptable computational cost, yielding good quality results when compared to those derived from detailed time-history analyses. Thus, the present methodology signifies a departure from the current state-of-design of acceleration-sensitive secondary building components, which does not fully account for the vibrations of the primary structure. Finally, the accuracy of the methodology is gauged through a number of application examples involving different combinations of primary-secondary systems.
机译：二次系统是非结构组件，其在结构内存在重要功能，但不被视为主要结构系统的组成部分。有许多类别的二级系统，用于解决架构方面，机械，电气，通信，供水和管道功能，以及结构内容的一部分。关于在地震易发区域的结构中安装二级系统的主要问题是在地震动作期间保存它们的完整性和功能，因为失败可能对财产损失和安全问题具有显着的后果。本研究介绍了一种新的方法，用于近似加速敏感的二级系统的地震响应，其质量低于主要结构总质量的1％，并且其地震激发完全来自该结构的运动，即相互作用现象被忽略了。该方法适用于安装在规则和灵活的主要结构上的二级系统，该辅助系统在展示楼层隔膜作用，并根据瞬间基于结构的偏转形状，从信息的偏转形状上量化了地震要求。该方法可以以替代方式应用，取决于结果的所需准确性和可接受的计算成本，与从详细的时历史分析衍生的那些时，产生良好的质量结果。因此，本方法意味着偏离当前的加速敏感二级建筑部件的设计状态，这不完全占主结构的振动。最后，通过涉及主要辅助系统的不同组合的许多应用示例来衡量方法的准确性。

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