Influence of dynamic properties on scaffoldings safety

Błazik‐Borowa, Ewa; Bęc, Jarosław

doi:10.1007/s43452-021-00295-3

Cited by 6 publications

(4 citation statements)

References 41 publications

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“…This might lead to a loss of focus on the task at hand (A Hola et al, 2017). Due to their lack of attention, workers get exhausted rapidly (Błazik-Borowa & Bęc, 2021). This is because alcohol has a sedative effect on the central nervous system.…”

Section: Worker's Unsafe Behaviourmentioning

confidence: 99%

[RETRACTED] Current State of Scaffolding Unsafe Factor: A Thematic Review

Mohammad,

Ja’afar

2023

IJSCET

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Construction industry plays a significant part in the growth of Malaysia's economy, and it is one of the country's most vital industries. Therefore, falling from a scaffolding is one of the most prevalent construction hazards. Scaffolding accidents are increased by factors such as inadequate capacity and incorrect usage of Personal Protective Equipment. Based on the previous studies, none of the researcher has reviewed scaffolding safety issues by using systematic literature review method. As a result, this review was driven to emphasize thecurrent state of scaffolding unsafe factors in order to close this research gap. The purpose of this systematic review is to summarize the available research from 2012 to 2022 about the current state of scaffolding unsafe factors. The research used Atlas.ti 8, a keyword search, and a snowballing approach to filter for inclusion criteria from SCOPUS, Science Direct, and Web of Science. However, following the inclusion and exclusion procedure, only 29 papers were utilized to assess the final articles. A thematic assessment of these 29 papers identified initial codes identifying and categorizing them as follows: worker behavior, worker skill, site condition, design fault, insufficient equipment, management problem, and Personal Protective Equipment. The discovery is likely to enhance scaffolding safety on construction sites. For future research, other researcher can use primary method such as qualitative or quantitative method focusing on specific location to determine scaffolding unsafe factors for a particular type of scaffoldings

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Section: Worker's Unsafe Behaviourmentioning

confidence: 99%

[RETRACTED] Current State of Scaffolding Unsafe Factor: A Thematic Review

Mohammad,

Ja’afar

2023

IJSCET

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“…The first graph shows the auto power spectrum of accelerations for horizontal vibrations along the scaffolding façade, while the second one represents vibrations perpendicular to the façade. Low natural frequencies make scaffolding susceptible to wind-induced vibrations [7,8] and vibrations generated by the movement of users on the scaffolding [2]. The movement of the structure is perceptible to users when walking on the scaffolding.…”

Section: Vibration Sources Acting On Scaffoldingmentioning

confidence: 99%

“…Scaffolding is a lightweight structure made of slender elements used many times, i.e., assembled and disassembled. The dynamic characteristics of such a structure are represented by low natural frequencies (see [1,2]). Scaffoldings are mainly used at construction sites as temporary support structures and therefore are influenced by all dynamic actions present at the place (cf.…”

Section: Introductionmentioning

confidence: 99%

Analysis of scaffolding harmonic excitation

Bęc,

Błazik-Borowa,

Szer

2023

Bulletin of the Polish Academy of Sciences Technical Sciences

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Scaffolding is equipment usually used at construction sites. A scaffolding structure is lightweight and made of elements used many times. The characteristics of scaffolding make it susceptible to dynamic actions present at the structure or occurring nearby. A scaffolding structure of medium size was subjected to analysis in this paper. The structure FEM model was loaded with single force harmonic excitation with various frequencies ranging from 1 Hz to 12 Hz applied in one of many selected points on the scaffolding façade. In the first step, natural frequencies and mode shapes of the analyzed structure were calculated. Then the full dynamic analysis was carried out to obtain maximum displacements of selected control points. The relation of excitation force frequency and location to the amplitudes of generated displacement was observed. It was found that low excitation frequencies close to the natural frequencies of the structure produced vibrations ranging to large areas of the scaffolding surface. Higher excitation frequencies are usually less propagated at the scaffolding but still may produce some discomfort to the structure users in the vicinity of the excitation force location. Scaffolding is equipment usually used at construction sites. A scaffolding structure is lightweight and made of elements used many times. The characteristics of scaffolding make it susceptible to dynamic actions present at the structure or occurring nearby. A scaffolding structure of medium size was subjected to analysis in this paper. The structure FEM model was loaded with single force harmonic excitation with various frequencies ranging from 1 Hz to 12 Hz applied in one of many selected points on the scaffolding façade. In the first step, natural frequencies and mode shapes of the analyzed structure were calculated. Then the full dynamic analysis was carried out to obtain maximum displacements of selected control points. The relation of excitation force frequency and location to the amplitudes of generated displacement was observed. It was found that low excitation frequencies close to the natural frequencies of the structure produced vibrations ranging to large areas of the scaffolding surface. Higher excitation frequencies are usually less propagated at the scaffolding but still may produce some discomfort to the structure users in the vicinity of the excitation force location.

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“…Strong vibrations are caused during working at scaffolding and by horizontal and vertical communication of scaffolding users. These vibrations are strongly affecting the workers' comfort and may endanger their safety [12,13].…”

Section: Vibrational Characteristics Of Façade Scaffoldingmentioning

confidence: 99%

Influence of anchoring and bracing system on dynamic characteristics of façade scaffolding

2023

Archives of Civil Engineering

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The basic dynamic characteristics of façade scaffolding are natural frequencies of vibrations and corresponding mode shapes. These properties affect the scaffolding safety, as well as comfort and safety of its users. Many of the dynamic actions present at scaffolding are in the low frequency range, i.e. below 10-15 Hz. The first natural frequency of a structure is usually in the range of 0.7 to 4 Hz which corresponds to resonant frequencies of human body and it means that vibrations induced at scaffolding may strongly affect the human comfort. The easiest way of increasing the rigidity of the structure is by ensuring correct boundary conditions (support, anchorage) and bracing of the structure. The numerical analysis was performed for the real scaffolding structure of medium size. The analysis consisted of natural frequencies calculation for the original structure and for models with modified bracing and anchoring systems. The bracing modifications were introduced by reducing or increasing the number of vertical bracing shafts. The anchor system was modified by reduction of the 6 anchors in the top right corner of the scaffolding in three stages or by evenly removing nearly 1/3 of the total number of anchors. The modifications of bracing and anchor systems resulted in changing the natural frequencies. The increase of natural frequencies due to higher number of anchors and more bracing is not even for all mode shapes. Bracing is more effective in acting against longitudinal vibrations, while anchoring against vibrations perpendicular to the façade.

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Influence of dynamic properties on scaffoldings safety

Cited by 6 publications

References 41 publications

[RETRACTED] Current State of Scaffolding Unsafe Factor: A Thematic Review

[RETRACTED] Current State of Scaffolding Unsafe Factor: A Thematic Review

Analysis of scaffolding harmonic excitation

Influence of anchoring and bracing system on dynamic characteristics of façade scaffolding

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