System identification and modeling of a dynamically tested and gradually damaged 10‐story reinforced concrete building
System identification and modeling of a dynamically tested and gradually damaged 10‐story reinforced concrete building
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动态测试并逐渐损坏的 10 层钢筋混凝土建筑的系统识别和建模
DOI：
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发表时间：
2018
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通讯作者：
Andrea Sacco
中科院分区：
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作者：
Seyedsina Yousefianmoghadam;I. Behmanesh;A. Stavridis;B. Moaveni;A. Nozari;Andrea Sacco
本文讨论了 10 层钢筋混凝土建筑的动态测试、系统识别和建模。在测试过程中，六堵填充墙分三个阶段被拆除，以造成损坏。在每个损伤阶段，使用偏心质量振动台进行动态测试。安装了加速度计来记录建筑物对感应激励的扭转和平移响应及其环境振动。使用两种可捕获墙体拆除效果的操作模态分析方法来识别所有损坏状态下的模态特性。建筑物的有限元模型有助于模态识别。反过来，通过比较数值和实验获得的模态参数来验证模型。经过验证的模型用于参数研究，以估计结构和非结构元素对建筑物动态特性的影响，并评估建筑规范中常用经验公式的有效性。还讨论了与复杂结构系统识别的适用性和可行性相关的问题，以及开发准确而有效的有限元模型的考虑因素。
This paper discusses the dynamic tests, system identification, and modeling of a 10‐story reinforced concrete building. Six infill walls were demolished in 3 stages during the tests to introduce damage. In each damage stage, dynamic tests were conducted by using an eccentric‐mass shaker. Accelerometers were installed to record the torsional and translational responses of the building to the induced excitation, as well as its ambient vibration. The modal properties in all damage states are identified using 2 operational modal analysis methods that can capture the effect of the wall demolition. The modal identification is facilitated by a finite element model of the building. In turn, the model is validated through the comparison of the numerically and experimentally obtained modal parameters. The validated model is used in a parametric study to estimate the influence of structural and nonstructural elements on the dynamic properties of the building and to assess the validity of commonly used empirical formulas found in building codes. Issues related to the applicability and feasibility of system identification on complex structures, as well as considerations for the development of accurate, yet efficient, finite element models are also discussed.