Experimental measure of impact in temporary handrails

Pomares, Juan Carlos; Mas, David; Lozano, C.; Bresó, S.; Irles, R.

doi:10.2495/su120111

Cited by 3 publications

(8 citation statements)

References 3 publications

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“…Dynamic dynamometers, strain gages, accelerometers and high speed cameras have been used in experiments with volunteers or with a ballast [14,15]. Figure 5 shows the modulus of acceleration obtained in an experimental study of the C-type guardrail.…”

Section: Measurementmentioning

confidence: 99%

“…In this case, the concentrated developed forces are tremendous; they might kill the injured person or cause irreversible damage to them. Some of authors have developed [14,15] an ergonomic system without straight supports to avoid direct impact on this edge protection system. Moreover, the authors highlight satisfactory behaviour in various real accidents involving falls on V-type safety nets in Spain and although data on accelerations was not obtained they are numerically evaluated to be around 6 g ( fig.…”

Section: Measurementmentioning

confidence: 99%

“…Moreover, the lack of information, together with the findings from recent detailed studies point to the fact that some of these values are questionable or even inadequate [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Soft retention in height fall safety devices

Irles¹,

Pomares²,

Segovia³

et al. 2014

WIT Transactions on the Built Environment

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Height falls in construction work cause fatal or serious accidents every year. Safety devices used to avoid this are supposed to stop the falling worker by developing forces that are low enough to prevent serious injury being caused during the retention process.In this paper three safety systems are analysed: collective protection such as safety nets (V-type) or provisory edge protection (C-class guardrails) and personal fall arrest systems (with a harness).There are many biological and mechanical variables involved in the retention process. Maximum or minimum values are needed for kinetic energy to be absorbed; the forces against a retained worker or system deflection, respectively, are required by certain codes governing the safety systems. Other codes only establish limits for some of these variables. Code criteria about cited requirements are not homogeneous and sometimes they are even inadequate due to a lack of knowledge about the relationships and implications concerning the mechanical variables. The corresponding interaction is difficult to evaluate and requires expensive experimental studies to be carried out on instrumented real size samples.Nevertheless, in the last decade, research on safety systems has been done on refined finite element models that can perform dynamic simulations of the impact. This paper contains important conclusions drawn from the original contributions of authors that suggest making relevant improvements to some of the corresponding codes. Comparisons of cheaper numerical predictions and real size experiments have proved that finite element models can be reliably used to analyse and design these safety devices.

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Section: Measurementmentioning

confidence: 99%

Section: Measurementmentioning

confidence: 99%

See 1 more Smart Citation

Soft retention in height fall safety devices

Irles¹,

Pomares²,

Segovia³

et al. 2014

WIT Transactions on the Built Environment

Self Cite

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“…These experiments were also useful to calibrate the numerical models and to design the original supports of the EPS. Ergonomic support [3] was designed to avoid direct impact when the ballast falls down directly against them, allowing sufficient deflection of the net and avoiding too major injuries on the person that falls. This is an unsolved question in point 6.4.3 of the current standard EN 13374.…”

Section: Introductionmentioning

confidence: 99%

“…To improve safety conditions regarding accidents involving falls, previous studies [1][2][3][4][5][6] have been conducted, using numerical models of EPS built with finite elements technique.…”

Section: Introductionmentioning

confidence: 99%

Previous numerical studies with deformable ballast on body impacts against building edge protection systems

Irles¹,

Carrión²,

González³

2016

Int. J. CMEM

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Recent studies with numerical models regarding edge protection systems (EPS), class C according to standard EN 13374, showed that some requirements are inadequate for human safety. This problem mainly arises when a person is injured by falling directly against the EPS supports.To analyse this subject, three series of numerical models, in accordance with EN 13374, have been produced. The paper describes these studies, which have been carried out using straight supports, different weight ballasts and also a deformable ballast.In the first series, impacts against straight supports have been analyzed and a standard EN 13374 ballast has been used. These first studies showed too many high impact factors on the ballast. The obtained values are absolutely inadequate and dangerous to the integrity of the human body. The second series was conducted to know how different weights and shapes of ballast affect the maximum accelerations suffered by the human body. Finally, in the third series, a more deformable ballast has been used to simulate impacts of workers against straight supports, nearest to the real behaviour of a human body.Results confirm and measure an excessive impact factor suffered by the falling person. Mainly in the first series, with direct impacts of standard ballast against straight supports, acceleration values have been generated that could seriously injure the body or even could kill workers.The second series showed that different weights and shapes -cylinder or sphere -of ballast affect the acceleration values calculated.Finally, in the third series, the deformable ballast has achieved results truer than previous studies with the more rigid ballast established by EN 13374.

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Acceleration and Deflection Analysis for Class C Edge Protection Systems in Construction Work

Pomares

Irles

Segovia

2014

J. Constr. Eng. Manage.

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13The requirements for class C edge protection systems in construction works (according 14 to EN 13374 code) are studied in this paper. Maximum acceleration suffered by a 15 falling body and maximum deflection of the protection system were analyzed through 16 some finite element models and real size experiments. The aim of this work is to 17 determine which value for deflection system entails an acceleration that is safe for the 18 human body. This value is compared with the requirements given by current version of 19 EN 13374 and an additional series of experiment were done to determine the 20 acceleration linked to minimum deflection required by code. According to obtained 21 results, a modification of this value is recommended. Additionally, a simple design 22 formula for a falling protection system is proposed as a quick tool for the initial steps of 23 design. 24

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Experimental measure of impact in temporary handrails

Cited by 3 publications

References 3 publications

Soft retention in height fall safety devices

Soft retention in height fall safety devices

Previous numerical studies with deformable ballast on body impacts against building edge protection systems

Acceleration and Deflection Analysis for Class C Edge Protection Systems in Construction Work

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