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Evolution of Dynamic Properties of a 5-Story RC Building During Construction

机译：施工期间五层RC建筑动态特性的演变

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A full scale five-story reinforced concrete building was built and tested on the NEES-UCSD shake table. The purpose of this experimental program was to study the response of the structure and nonstructural systems and components (NCSs) and their dynamic interaction during seismic excitation of different intensities. The building specimen was tested under base-isolated and fixed-based conditions. Furthermore, as the structure was being built, an accelerometer array was deployed in the specimen to study the evolution of its modal parameters during the construction process and due to placement of major NCSs. A sequence of dynamic tests, including daily ambient vibration tests, impact/free vibration and forced vibration (white noise base excitation) tests, were performed on the structure at different stages of construction. Several state-of-the-art system identification methods, including two output-only (SSI-DATA and NExT-ERA) and one input-output (OKID-ERA), were used to estimate the modal properties of the structure (natural frequencies, damping ratios and mode shapes). The results obtained allow to compare the modal parameters obtained from different methods as well as the performance of these methods and to investigate the effects of the construction process and NCSs on the dynamic properties of the building specimen.
机译：在NEES-UCSD摇动台上建造并测试了全规模的五层钢筋混凝土建筑。该实验计划的目的是研究结构和非结构系统和组分（NCSS）的响应及其在不同强度的地震激发过程中的动态相互作用。在基于碱基和固定的条件下测试建筑物标本。此外，随着结构的构建，在试样中部署了加速度计阵列，以研究其在施工过程中的模态参数的演变，并且由于处于主要NCSS的位置。在不同阶段的结构上对结构进行了一系列动态测试，包括日常环境振动试验，冲击/自由振动和强制振动（白色噪声基础激发）测试。包括两个最先进的系统识别方法，包括仅输出（SSI-DATA和NEXT-ERA）和一个输入输出（OKID-ERA）来估计结构的模态属性（自然频率，阻尼比率和模式形状）。获得的结果允许比较从不同方法获得的模态参数以及这些方法的性能，并研究建筑过程和NCS对建筑物标本的动态性质的影响。

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