Energy absorption of safety nets in building construction

Eulogio, Enrique Gonzalo Segovia; Más, Ramón Irles

doi:10.2495/su060411

Cited by 3 publications

(4 citation statements)

References 1 publication

(1 reference statement)

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“…The existing flexible protection system generally uses nylon net [40], which is formed by crossing high-strength nylon ropes and can be connected to the building through support ropes and covered on the holes of the building structure to provide protection, as shown in Figure 1. Research [23,24] has shown that almost all impact energy of such protective systems is dissipated by the large deformation of the protective mesh when subjected to impact. Due to its simple structure and the poor energy consumption capacity of nylon rope nets, the protective capacity of the protective system cannot exceed 30 kJ.…”

Section: Existing Protection Systemmentioning

confidence: 99%

“…Filho [22] compared two fall protection measures used in construction in Brazil and found that protective measures with safety nets are safer. Segovia [23] established a numerical model to simulate the impact test of a "V"-type safety net with an impact energy of 7 kJ, emphasizing the importance of energy absorption. Chen [24] studied the protective performance of high-strength nylon nets.…”

Section: Introductionmentioning

confidence: 99%

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Design Method and Impact Response of Energy-Consuming High-Fall Flexible Protection System for Construction

Liao

Dong³

et al. 2023

Buildings

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High-fall accidents refer to accidents where construction personnel, building materials, and equipment fall from a height, usually resulting in serious casualties and significant economic losses. This paper proposes a high-fall flexible protection system and its design approach with a tensile yield energy-consuming mechanism to solve high-fall accidents. The design approach based on component characteristics that obtained through tests contains energy matching, component internal force balance, and a two-level energy consumption mechanism. Component tests were conducted with mesh bursting tests and energy dissipator static tensile tests to obtain the characteristics of the intercepting net under the flexible boundary condition, and the force-displacement model of the ring-type energy dissipater. Combined with an actual project, we designed a high-fall flexible protection system with a protection energy level of 800 kJ for the core tube of an ultra-high-rise building construction using this method. The impact of dynamic response under multiple cases including the overall fall of the construction formwork was analyzed by dynamical numerical calculation models. The result shows that the system can effectively intercept high-falling objects and exhibit good two-stage energy dissipation characteristics to consume the impact energy. Compared with the protection system without an energy consumption mechanism, the internal force response of the steel wire rope and the suspended frame reduce by about 60%, and the energy consumption capacity increase more than six times. The protection technique proposed in this paper can effectively solve the problem of high-level impact protection such as falling construction formwork equipment, and improve construction safety.

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Section: Existing Protection Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design Method and Impact Response of Energy-Consuming High-Fall Flexible Protection System for Construction

Liao

Dong³

et al. 2023

Buildings

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“…Alternatively it can be predicted using numerical models [12,13]. Table 3 shows the deflection value in each safety system, along with the corresponding energies and maximum accelerations (and forces), as predicted by numerical models.…”

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%

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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