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Natural dynamic characteristics of volumetric steel modules with gypsum sheathed LSF walls: Experimental study
Structures ( IF 4.1 ) Pub Date : 2021-05-01 , DOI: 10.1016/j.istruc.2021.04.068
M. Alembagheri , P. Sharafi , M. Rashidi , A. Bigdeli , M. Farajian

As part of a research on structural response of modular buildings and assemblages, this experimental study investigates the effects of gypsum sheathed light-gauge steel stud walls on the natural dynamic characteristics of modular steel frames. A full-scale volumetric steel module is instrumented with sensitive accelerometers connected to a data acquisition system, to study the effects of different infill wall configurations. To this end, the module’s sides are covered with bare light gauge steel frames and then different configurations and arrangements of gypsum plasterboard linings. The module’s acceleration responses are recorded during free and ambient vibration tests for each case. Then the operational modal analysis is conducted on the recorded data using output-only algorithms to extract the main dynamic characteristics of the steel module, including natural frequencies, mode shapes, and modal damping ratios. The contribution of different configurations and arrangements of infill walls to the response are examined and their effects are discussed. It is observed that the infill walls can change the dynamic characteristics of the modular steel frame more than the level suggested by the design specifications, such as 30–50% reduction by ASCE7-16.



中文翻译:

石膏铠装低烟无卤墙体的体积钢模件的自然动力特性:实验研究

作为对模块化建筑物和组合件的结构响应进行研究的一部分,该实验研究旨在研究石膏护套轻型钢栓钉墙对模块化钢框架的自然动力特性的影响。完整的体积钢模块配有与数据采集系统连接的灵敏加速度计,以研究不同填充墙配置的影响。为此,模块的侧面覆盖有裸露的轻型钢框架,然后覆盖了石膏石膏板衬里的不同配置和布置。在每种情况下,在自由振动和环境振动测试期间都会记录模块的加速度响应。然后使用仅输出算法对记录的数据进行操作模态分析,以提取钢模块的主要动态特性,包括固有频率,模态形状和模态阻尼比。检查了填充墙的不同配置和布置对响应的贡献,并讨论了其影响。可以观察到,填充墙可以改变模块化钢框架的动态特性,其程度超过了设计规范所建议的水平,例如ASCE7-16将其降低了30%至50%。

更新日期:2021-05-02
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