scholarly journals Experimental Analysis of Guardrail Structures for Occupational Safety in Construction

2021 ◽  
Vol 15 (1) ◽  
pp. 141-151
Author(s):  
Diniane Baruffi ◽  
Marcelo Fabiano Costella ◽  
Zacarias Martin Chamberlain Pravia
Keyword(s):  
Occupational Safety ◽  
Static Load ◽  
Experimental Tests ◽  
Experimental Models ◽  
Impact Testing ◽  
International Standards ◽  
Construction Sites ◽  
Static Testing ◽  
Brazilian Standard ◽  
Construction Works

Background: Guardrails are structures that protect workers from falling from heights at construction sites. Objective: The objective is to evaluate experimental models by applying static and impact loads to wood and steel guardrails. Methods: Brazilian and international standards were consulted to define the actions applied to guardrails, which were tested experimentally in three models of each material in a full-size prototype. Results: The experimental results indicate that the models studied could support the applied loads, and no local or global system rupture occurred. However, the displacements for the static load of 1500 N/m required by Brazilian RTP 01 for both models did not comply with Brazilian standard NBR 14718 because they had displacements above 20 mm, despite meeting other international standards for static testing and impact testing. Conclusion: From the results obtained in the experimental tests, it was possible to verify that the structures withstood the applied loads and could be used safely in civil construction works. However, the load requirements of RTP 01 are excessive, and NBR 14718 is not suitable for checking temporary guardrail structures. This demonstrates the need for the Brazilian standard to be revised to guide the dimensioning and verification of structures in order to adapt to international standards.

An Analysis to the Understanding of Safety Equipment for Construction Workers

2014 ◽  
Vol 1044-1045 ◽  
pp. 228-231
Author(s):  
Yoon Seok Shin ◽  
Gwang Hee Kim
Keyword(s):  
Occupational Safety ◽  
Deep Understanding ◽  
Health Agency ◽  
Construction Workers ◽  
Safety Equipment ◽  
Construction Sites ◽  
Safety And Health ◽  
Actual Use ◽  
Accident Statistics ◽  
Construction Works

According to the industrial accident statistics reported by the Korea Occupational Safety and Health Agency, about 10 percent of accidental work site deaths were caused by defect or misuse of safety equipment [1]. For this reason, safety equipment should be understood properly to prepare a plan for its appropriate use [2]. Therefore, this study aims to identify the related problems by studying the understanding of safety equipment for construction works at sites. To conduct this study, a questionnaire survey of 100 construction workers in apartment building construction sites in Jeolla-do was carried out. This study reveals that the education on safety equipment is of help for construction workers, but they do not have a deep understanding of it in actual use.

scholarly journals Análise da Segurança do Trabalho nos canteiros de obras do município de Guanambi-BA

2020 ◽  
Vol 15 (2) ◽  
pp. 287-299
Author(s):  
Carlos Eduardo Lopes Fagundes ◽  
Harley Prado Neves ◽  
Thomas Leonardo Marques de Castro Leal
Keyword(s):  
Environmental Risk ◽  
Prevention Program ◽  
Occupational Safety ◽  
Worker Safety ◽  
Risk Prevention ◽  
Construction Sites ◽  
Qualitative And Quantitative ◽  
Regulatory Standards ◽  
Exploratory Survey ◽  
Construction Works

RESUMO:  O desígnio principal da segurança do trabalho é garantir que ele seja realizado da forma como estava previsto, isento de perigo aos trabalhadores envolvidos. Por conseguinte, o objetivo desta pesquisa é analisar o (des)cumprimento normativo diante das obras de construção civil de canteiros no município de Guanambi-BA, no que se refere à segurança do trabalhador. Para isso, foi realizada uma pesquisa de caráter exploratório em cinco canteiros de obras de Guanambi entre janeiro e fevereiro de 2018, com responsáveis técnicos e empregados, por meio da aplicação de questionários de cunho qualitativo e quantitativo, em um total de 12 (doze) entrevistados. Os dados obtidos foram agrupados de acordo aspectos das Normas Regulamentadoras (NRs). Através da pesquisa constataram-se situações irregulares, como a falta do Programa de Prevenção de Riscos Ambientais (PPRA) e do Programa de Condições e Meio Ambiente de Trabalho na Indústria da Construção (PCMAT) em todos os canteiros, além de apresentar situações irregulares no que diz respeito ao trabalho em altura, dentre outros. Porém, também foram observadas algumas medidas corretas e em consonância com as normas regulamentadoras, mostrando que, a situação dos canteiros no município de Guanambi-BA, embora ainda tenha muito a se fazer, existem potencialidades que podem ser aproveitadas e exploradas. Abstract: The main purpose of occupational safety is to ensure that it is carried out as intended, without danger to the workers concerned. Therefore, the objective of this research is to analyze the normative (non) compliance with the construction works of construction sites in the municipality of Guanambi-BA, with regard to worker safety. To this end, an exploratory survey was conducted at five construction sites in Guanambi between January and February 2018, with technical managers and employees, through the application of qualitative and quantitative questionnaires, in a total of 12 (twelve). interviewed. The data obtained were grouped according to aspects of the Regulatory Standards (NRs). The survey found irregular situations, such as the lack of the Environmental Risk Prevention Program (PPRA) and the Construction Conditions and Environment Program (PCMAT) in all construction sites, in addition to presenting irregular situations in the regards work at height, among others. However, some correct measures were also observed and in line with the regulatory norms, showing that the situation of the beds in the municipality of Guanambi-BA, although there is still much to do, there are potentials that can be harnessed and exploited.

Creep Parameters for Pile Settlement Equations

1989 ◽  
Vol 111 (4) ◽  
pp. 258-263
Author(s):  
D. Stelzer ◽  
O. B. Andersland
Keyword(s):  
Static Load ◽  
Experimental Tests ◽  
Sand Particle ◽  
Shear Stresses ◽  
Frozen Ground ◽  
Creep Equation ◽  
Frozen Sand ◽  
Pile Settlement ◽  
Ice Content ◽  
Friction Pile

Friction pile settlement in frozen ground is tyically predicted on the basis of a creep equation relating shear stresses at the soil/pile interface to pile displacement rates. Creep parameters are used to characterize soil type, soil/ice structure, temperature, and loading conditions. Experimental tests involving model steel piles embedded in frozen sand provided data showing that change in a given test variable can alter the numerical value for some of the creep parameters. The test variables included static, incremental, and dynamic loading; pile surface roughness; soil ice content; and sand particle size. Changes observed included the apparent effect on creep rate when a small dynamic load was superimposed on the static load. A tabulation of observed creep parameter changes is included.

On-Site Experimental Testing to Study the Vibration of Composite Floors

2014 ◽  
Vol 601 ◽  
pp. 231-234
Author(s):  
Cristian Lucian Ghindea ◽  
Dan Cretu ◽  
Monica Popescu ◽  
Radu Cruciat ◽  
Elena Tulei
Keyword(s):  
Dynamic Characteristics ◽  
Experimental Testing ◽  
Concrete Slab ◽  
Human Perception ◽  
Experimental Tests ◽  
International Standards ◽  
Structural Element ◽  
Element Analysis ◽  
Floor Slabs ◽  
Composite Floors

As a general trend, in order to reduce material consumption or to reduce the mass of the structures, composite floor slabs solutions are used to achieve large spans floor slabs. This solutions led to floors sensitive to vibrations induced generally by human activities. As a verification of the design concepts of the composite floors, usually, it is recommended a further examination of the floor after completion by experimental tests. Although the experimental values of the dynamic response of the floor are uniquely determined, the processing can take two directions of evaluation. The first direction consist in determining the dynamic characteristics of the floor and their comparison with the design values. Another way that can be followed in the processing of the experimental results is to consider the human perception and comfort to the vibration on floors. The paper aims to present a case study on a composite floor, with steel beams and concrete slab, tested on-site. Both aspects of data processing are analyzed, in terms of the structural element, and in terms of the effect on human perception and comfort. Experimentally obtained values for the dynamic characteristics of the floor are compared with numerical values from finite element analysis, while the second type of characteristic values are compared with various human comfort threshold values found in international standards.

The Specific Characteristics of Shock and Blast Impacts on Construction Sites

2021 ◽  
pp. 81-88
Author(s):  
A.A. Komarov ◽  
Keyword(s):  
Dynamic Load ◽  
Static Load ◽  
Dynamic Loads ◽  
Potential Hazard ◽  
Construction Sites ◽  
Static Loads ◽  
Equivalent Static Loads ◽  
Plane Crash ◽  
Nuclear Plants ◽  
The Impact

The practices of hazardous and unique facilities’ construction imply that specific attention is paid to the issues of safety. Threats associated with crash impacts caused by moving cars or planes are considered. To ensure safety of these construction sites it is required to know the potential dynamic loads and their destructive capacity. This article considers the methodology of reducing dynamic loads associated with impacts caused by moving collapsing solids and blast loads to equivalent static loads. It is demonstrated that practically used methods of reduction of dynamic loads to static loads are based in schematization only of the positive phase of a dynamic load in a triangle forms are not always correct and true. The historical roots of this approach which is not correct nowadays are shown; such approach considered a detonation explosion as a source of dynamic load, including TNT and even a nuclear weapon. Application of the existing practices of reduction of dynamic load to static load for accidental explosions in the atmosphere that occur in deflagration mode with a significant vacuumization phase may cause crucial distortion of predicted loads for the construction sites. This circumstance may become a matter of specific importance at calculations of potential hazard of impacts and explosions in unique units — for instance, in the nuclear plants. The article considers a situation with a plane crash, the building structure load parameters generated at the impact caused by a plane impact and the following deflagration explosion of fuel vapors are determined.

scholarly journals A Narrative Review of Libidibia ferrea: Botanical Aspects, Ethnopharmacological Properties, Phytochemical Characteristics, Toxicity, and Experimental Tests

2021 ◽  
pp. 16-30
Author(s):  
Nayanne C. O. da S. Almeida ◽  
Silvania da C. Furtado ◽  
José F. M. Barcellos
Keyword(s):  
Urban Areas ◽  
Folk Medicine ◽  
Experimental Studies ◽  
Experimental Tests ◽  
Stem Bark ◽  
Experimental Models ◽  
Narrative Review ◽  
In Vivo Models ◽  
Methodological Guidelines

Introduction: Jucá or pau-ferro (Libidibia ferrea) is an arboreal plant from the Fabaceae family. It is commonly used in traditional medicine in the treatment of various diseases, including inflammatory process. Aims: The objective of this narrative review is to present botanical aspects, ethnopharmacological properties, phytochemical characteristics, toxicity highlighting, and experimental models with L. ferrea. Results: Botanical Aspects: Jucá has several uses such as in landscaping (stem and canopy), in arborization of urban areas. Ethnopharmacological Properties: It is used in the treatment of various diseases such as diabetes, flu, asthma and, inflammatory processes of which different parts are used (root, stem bark, leaves, fruits, seeds). Phytochemical Characteristics: Phenolic compounds, fatty acids, and terpenoids are among the compounds monthly used. Toxicity: In vivo models have been used to verify toxicity and in most studies the plant presented no toxicity in its use. Experimental studies: Animals, such as mice, dogs, rats, etc. and different models of studies to analyze the action of the plant were used. Conclusions: Such low toxicity, associated with its widespread use in folk medicine and its various effects demonstrated in the studies included in this Review have corroborated for the continuity of the research with L. ferrea. New studies, however, ought to follow methodological guidelines, such as the Animal Research: reporting in vivo Experiments (ARRIVE) so that, a methodological design secures more homogeneous studies capable of quantifying the actual size of the effect in the plant may have in clinical studies.  

Crane Lift-Off Control of Inclined Payloads

2017 ◽  
Author(s):  
Michael J. Toth ◽  
Colby F. Lewallen ◽  
Joseph C. Hanson ◽  
Shenghai Wang ◽  
William Singhose
Keyword(s):  
Pid Controller ◽  
Experimental Tests ◽  
Peak Amplitude ◽  
Level Surface ◽  
Proportional Integral Derivative ◽  
Construction Sites ◽  
Residual Vibration ◽  
Proportional Integral ◽  
Lift Off ◽  
Inclined Surface

It is difficult for crane operators to lift and maneuver payloads without causing significant, uncontrolled motion. Consequently, research in the area of crane operation has focused on designing controllers to minimize payload swing. However, lifting long and slender payloads (e.g., steel I-beams) from a non-level surface (e.g., like many outdoor construction sites) has not been addressed in much detail. This paper evaluates the amplitude of residual swing and robustness of two different control methodologies while hoisting a slender payload up into the air from an inclined surface. A semi-automatic approach, where the crane operator controls the lift direction and a proportional-integral-derivative (PID) controller adjusts the overhead trolley position, was developed. Experimental tests demonstrate that this method reduces the peak amplitude of residual vibration by about 80% for most non-zero incline angles.

IMPAK PERISIAN IM-SMARTSAFETY TERHADAP PEKERJA ASING DALAM INDUSTRI PEMBINAAN

2015 ◽  
Vol 77 (4) ◽  
Author(s):  
Nurul Azita Salleh ◽  
Mohd Nasrun Mohd Nawi ◽  
Norazah Mohd Nordin ◽  
Abdul Khalim Abdul Rashid
Keyword(s):  
Quantitative Research ◽  
Occupational Safety ◽  
Health And Safety ◽  
Foreign Workers ◽  
Construction Sites ◽  
Quantitative Research Methods ◽  
Teaching Aids ◽  
Safety Regulations ◽  
Safety Belts ◽  
The Impact

This paper focuses on the discussion of the impact of IM-SmartSAFETY courseware on foreign workers in the construction industry. This courseware was developed as an alternative media of information delivery in bilingual multimedia and two directional teaching aids for foreign workers in Health and Safety Induction Course (HSIC). The study discovered that the IM-SmartSAFETY courseware have contributed a great impact and meets the needs of the foreign workers on construction sites as well as one of the mechanism to help tackle the language problem. The study was conducted quantitative research methods supported by qualitative research is found a parallel in terms of data acquisition which is seen IM-SmartSAFETY courseware has helped meet the needs of foreign workers regarding personal protective equipment (PPE) in terms of knowledge about the types and uses of PPE, safety regulations related to PPE, proper wear of PPE and the effect of the proper usage of PPE which include safety helmets, safety boots, protective clothing or safety jackets, ear protection, eye and face protection, safety belts, protective glove and protective breathing after using the courseware. The findings also exhibits that the overall of helpfulness of courseware also found that language issues have been resolved. In fact, the acquisition of knowledge foreign workers on safety at construction sites and the way of delivery information by the trainers to foreign workers have been enhanced while reducing the rate of accidents on construction sites and increase foreign workers awareness about the hazard and improve occupational safety of foreign workers in Malaysia.

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