Floor response and design spectra of a museum building before and after isolation are studied; these are used for estimating the response and seismic design of acceleration-sensitive non-structural components. First, two finite-element models of the building before and after seismic isolation are established and verified through ambient vibration tests. Second, seven earthquake motions are chosen to analyse the models; differences between floor response curves and earthquake motions are analysed based on peak acceleration and frequency spectra. Finally, taking the floor response curves as input, the floor acceleration response spectra before and after isolation are calculated, and the design spectra are fitted. Analytical results demonstrate that the dynamic characteristics of the finite-element model agree well with test values, and peak acceleration of the isolated structure is around 75% lower than that of the non-isolated structure. The predominant frequency of the floor response curves is consistent with the natural frequency of the structure. Moreover, the floor acceleration response spectra are influenced by the earthquake motions and the structures, which reflect the characteristics of both. The floor design response spectra are divided into different sections and mathematical formulas are developed. The findings could be applied to the seismic protection design of non-structural components.

中文翻译：

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隔离前后博物馆建筑楼层响应谱分析与拟合

研究了某博物馆建筑隔离前后的楼层响应和设计谱；这些用于估计对加速度敏感的非结构部件的响应和抗震设计。首先，建立了建筑物隔震前后两个有限元模型，并通过环境振动试验进行验证。其次，选择了七个地震运动来分析模型；基于峰值加速度和频谱分析地板响应曲线和地震运动之间的差异。最后，以楼层响应曲线为输入，计算隔离前后的楼层加速度响应谱，拟合设计谱。分析结果表明，有限元模型的动态特性与试验值吻合较好，隔离结构的峰值加速度比非隔离结构低75%左右。地板响应曲线的主要频率与结构的固有频率一致。此外，地板加速度响应谱受地震运动和结构的影响，反映了两者的特性。楼板设计响应谱被划分为不同的部分，并开发了数学公式。研究结果可应用于非结构部件的抗震设计。楼板加速度响应谱受地震运动和结构的影响，反映了两者的特点。楼板设计响应谱被划分为不同的部分，并开发了数学公式。研究结果可应用于非结构部件的抗震设计。楼板加速度响应谱受地震运动和结构的影响，反映了两者的特点。楼板设计响应谱被划分为不同的部分，并开发了数学公式。研究结果可应用于非结构部件的抗震设计。