Experimental Study on the Natural Dynamic Characteristics of Steel-Framed Modular Structures

Buildings

Payam Rahnamayiezekavat¹  Pejman Sharafi¹  Mostafa Farajian¹  Hadi Eslamnia²  Ali Bigdeli³ 

[1]Centre for Infrastructure Engineering, School of Engineering, Design and Built Environment, Western Sydney University, Penrith 2747, Australia

[2]Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran 15875-4413, Iran

[3]Department of Civil and Environmental Engineering, Tarbiat Modares University, Tehran 14115-111, Iran

关键词: modular structures;    natural frequency;    experimental study;    inter-connection;    damping ratio;    mode shape;   

DOI  :  10.3390/buildings12050587

来源: DOAJ

【 摘 要 】

Corner-supported modular structures are made of repetitive prefurnished, prefinished modular units, which are fabricated in a factory and transported to the site of a building to form a permanent building block. The modular units are then tied together through the use of so-called inter-modular connections, or inter-connections, which form a different configuration at joints compared to conventional steel structures. The presence of inter-connections in these structures, in addition to beam-to-column connections or intra-connections, may change their dynamic characteristics, including natural frequencies, mode shapes, and damping ratios. This paper aims to investigate the dynamic characteristics of a modular building through the use of operational modal analysis (OMA). A half-scaled three-storey modular structure, designed and instrumented with highly sensitive accelerometers, was experimentally tested under pure and randomly generated vibrations. The time history of the response acceleration of the structure was recorded using a data acquisition system. Different output-only techniques of OMA, based on both frequency and time domains, were employed to analyse the recorded response acceleration of the structure and extract the natural frequencies, mode shapes, and damping ratios. These techniques are peak picking (PP), enhanced frequency-domain decomposition (EFDD), and stochastic subspace identification (SSI). The outcomes in this paper can be used for further research on the development of an experimental formula for the design of multistorey modular buildings against lateral loads.

【 授权许可】

Unknown