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

Farajian, Mostafa; Sharafi, Pezhman; Bigdeli, Ali; Eslamnia, Hadi; Rahnamayiezekavat, Payam

doi:10.3390/buildings12050587

Cited by 9 publications

(4 citation statements)

References 39 publications

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“…It is noted that the studies mentioned are by no means a comprehensive overview, however those discussed are highly relevant to the present effort. Amongst the most closely related, in a study conducted by Farajian et al., 1 a half‐scaled three‐story modular steel structure was tested under randomly generated vibrations, and different output‐only system identification techniques based on both frequency and time domains were employed. This effort focused on analyzing the recorded acceleration response of the structure, and extracting natural frequencies, mode shapes, and damping ratios.…”

Section: Introductionmentioning

confidence: 99%

Modal characterization of a three‐story buckling‐restrained braced frame steel building by non‐destructive field testing

Morano,

Lin,

Hutchinson

et al. 2024

Earthq Engng Struct Dyn

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A full‐scale, reconfigurable, three‐story steel building was constructed and its modal properties identified prior to shake table testing on the UC San Diego Large High Performance Outdoor Shake Table (LHPOST6). The aim of this pre‐shake table test erection was to demonstrate the rapid constructability of the building and identify construction fit issues prior to its assembly on LHPOST6. This posed a unique opportunity to characterize the building's modal properties using a variety of non‐destructive, low‐amplitude techniques. To this end, two novel, non‐destructive methods were used, namely: (1) impact tests conducted by swinging a tire from a crane to impact strategically selected locations, and (2) dynamic base vibration tests, induced by driving heavy machinery in the vicinity of the base of the structure. A system of accelerometers located throughout the structure captured waves propagating from each test to characterize the as‐built dynamic properties of the building. Results from various system identification methods are presented and compared to theoretical and numerical analysis. Comparisons indicate that the theoretical, numerical, and experimentally determined periods are nominally within 15% of each other. The erection of the structure was complete over the course of 3 days and construction fit‐up issues were addressed. The structure was then rapidly deconstructed and stored prior to erection for full‐scale shake table testing. This pre‐shake table test exercise demonstrated the viability of two, simple, low‐amplitude excitation approaches for use in the dynamic characterization of full‐scale buildings, with results consistent with theoretical and numerical models.

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Section: Introductionmentioning

confidence: 99%

Modal characterization of a three‐story buckling‐restrained braced frame steel building by non‐destructive field testing

Morano,

Lin,

Hutchinson

et al. 2024

Earthq Engng Struct Dyn

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“…Modular steel buildings (MSBs) have become increasingly popular in the construction industry due to their numerous advantages, including cost-effectiveness, speed of construction period, and flexibility. Modular buildings are built upon the Lego matter construction approach, in which its components (modules) are fabricated in industrial units (off-site) in a factory-controlled environment system based on the customer's request and then transferred and assembled at the construction site (on-site) in a desired configuration to form an entire building [1][2][3][4][5][6][7]. Compared to the traditional onsite technique, the entire modular building's on-site construction time is limited to assembly modules with suitable inter-module connections (IMCs).…”

Section: Introductionmentioning

confidence: 99%

Optimising Plate Thickness in Interlocking Inter-Module Connections for Modular Steel Buildings: A Finite Element and Machine Learning Approach

Elsayed,

Mutalib,

Elsayed

et al. 2024

Preprint

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Modular steel buildings (MSBs) interlocking inter-module connections (IMCs) have piqued researchers’ interest. However, the existing literature has not yet studied the optimisation of its plate thicknesses. This paper, therefore, focuses on optimising interlocking (IMCs) plate thickness in (MSBs), leveraging previous experimental and numerical simulation methodologies. Various numerical models for four MSBs interlocking (IMCs) with plate thicknesses (4 mm, 6 mm, 10 mm, and 12 mm) were developed under compression loading conditions. The study’s novelty lay in its comprehensive parametric analysis, which evaluated the slip phenomenon in (MSBs) connections and introduced a slip prediction model validated against empirical data. Further innovative machine learning approach was utilised to predict slip values based on applied force through a random forest regression model trained using the 'Treebagger' function. Sensitivity analysis and comparisons with alternative methods were utilised to underscore the reliability and applicability of the findings. The results showed that 11.03 mm was the optimal plate thickness for interlocking (IMCs) in modular steel buildings, with up to 8.08% reduced material costs. Increasing plate thickness boosts its deformation resistance by up to 50.75%. ‘TreeBagger’ random forest for anomaly detection and machine learning improves slip prediction up to 7% at higher force levels.

show abstract

“…Modular Steel Buildings (MSBs) have become increasingly popular in the construction industry due to their numerous advantages, including cost-effectiveness, speed of construction period, and flexibility. Modular buildings are built upon the Lego matter construction approach, in which their components (modules) are fabricated in industrial units (off-site) in a factory-controlled environment system based on the customer's request and then transferred and assembled at the construction site (on-site) in a desired configuration to form an entire building [1][2][3][4][5][6][7]. Compared to the traditional on-site technique, the entire modular building's on-site construction time is limited to assembly modules with suitable Inter-Module Connections (IMCs).…”

Section: Introductionmentioning

confidence: 99%

Optimising Plate Thickness in Interlocking Inter-Module Connections for Modular Steel Buildings: A Finite Element and Random Forest Approach

Elsayed,

Mutalib,

Elsayed

et al. 2024

Buildings

View full text Add to dashboard Cite

Interlocking Inter-Module Connections (IMCs) in Modular Steel Buildings (MSBs) have garnered significant interest from researchers. Despite this, the optimisation of plate thicknesses in such structures has yet to be extensively explored in the existing literature. Therefore, this paper focuses on optimising the thickness of interlocking IMCs in MSBs by leveraging established experimental and numerical simulation methodologies. The study developed various numerical models for IMCs with plate thicknesses of 4 mm, 6 mm, 10 mm, and 12 mm, all subjected to compression loading conditions. The novelty of this study lies in its comprehensive parametric analysis, which evaluates the slip prediction model. A random forest regression model, trained using the ‘TreeBagger’ function, was also implemented to predict slip values based on applied force. Sensitivity analysis and comparisons with alternative methods underscored the reliability and applicability of the findings. The results indicate that a plate thickness of 11.03 mm is optimal for interlocking IMCs in MSBs, achieving up to 8.08% in material cost reductions while increasing deformation resistance by up to 50.75%. The ‘TreeBagger’ random forest regression significantly enhanced slip prediction accuracy by up to 7% at higher force levels.

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

Cited by 9 publications

References 39 publications

Modal characterization of a three‐story buckling‐restrained braced frame steel building by non‐destructive field testing

Modal characterization of a three‐story buckling‐restrained braced frame steel building by non‐destructive field testing

Optimising Plate Thickness in Interlocking Inter-Module Connections for Modular Steel Buildings: A Finite Element and Machine Learning Approach

Optimising Plate Thickness in Interlocking Inter-Module Connections for Modular Steel Buildings: A Finite Element and Random Forest Approach

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