Uncertainties and Human Errors in the Design and Execution of Steel Structures

2017 ◽  
Author(s):  
Goran Alpsten
Keyword(s):  
Human Error ◽  
Steel Structures ◽  
Steel Specimen ◽  
Strength Properties ◽  
Statistical Distribution ◽  
Rolled Steel ◽  
Cross Sectional ◽  
Human Errors ◽  
Steel Members ◽  
Numerical Integration Procedure

This paper contains a compilation of results from some 50 000 steel specimen tests and close to 5 000 measurements of the cross-sectional properties of rolled steel members. Based on the statistical distribution of these properties the statistical distribution of the sectional capacity of such steel members is evaluated using a numerical integration procedure. For standard structural steel members the variations of the strength properties are reasonably well-known and may be used in reliability assessment methods for the design of structures. However, it has been observed in many actual failures with steel structures that the cause of such failures normally is one gross human error, rather than a combination of “normal” variations in parameters affecting the actions and response of the structures. Another observation from failures experienced with steel structures is that gross human errors in execution are more critical than gross errors in the design process.

Causes of Structural Failures with Steel Structures

2017 ◽  
Author(s):  
Goran Alpsten
Keyword(s):  
Structural Damage ◽  
Human Error ◽  
Structural Reliability ◽  
Steel Structures ◽  
Fatigue Loading ◽  
Structural Instability ◽  
Human Errors ◽  
Collapse Mode ◽  
Load Carrying ◽  
Structural Failures

This paper is based on the experience from investigating over 400 structural collapses, incidents and serious structural damage cases with steel structures which have occurred over the past four centuries. The cause of the failures is most often a gross human error rather than a combination of “normal” variations in parameters affecting the load-carrying capacity, as considered in normal design procedures and structural reliability analyses. Human errors in execution are more prevalent as cause for the failures than errors in the design process, and the construction phase appears particularly prone to human errors. For normal steel structures with quasi-static (non-fatigue) loading, various structural instability phenomena have been observed to be the main collapse mode. An important observation is that welds are not as critical a cause of structural steel failures for statically loaded steel structures as implicitly understood in current regulations and rules for design and execution criteria.

scholarly journals Mechanical Behavior of Damaged H-Section Steel Structure

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Xibing Hu ◽  
Rui Chen ◽  
Yuxuan Xiang ◽  
Yafang Chen ◽  
Qingshan Li
Keyword(s):  
Cross Sections ◽  
Elastic Moduli ◽  
Mechanical Test ◽  
Steel Structure ◽  
Steel Structures ◽  
Computational Accuracy ◽  
Cross Sectional ◽  
Steel Columns ◽  
Steel Members ◽  
The Cross

Steel structures are usually damaged by disasters. According to the influence law of the damage on the elastic modulus of steel obtained by the mechanical test of damaged steel, the average elastic moduli of H-section steel members were analyzed. The equations for calculating the average elastic moduli of damaged H-section steel members at different damage degrees were obtained. By using the analytical cross-sectional method, the cross-sectional M-Φ-P relationships and the dimensionless parameter equations of the H-sections in the full-sectional elastic distribution, single-sided plastic distribution, and double-sided plastic distribution were derived. On the basis of the cross-sectional M-Φ-P relationships and dimensionless parameters of actual steel members, the approximate calculation equations for the damaged cross sections were obtained. The Newmark method was used to analyze the deformation of damaged steel columns. Analytical results show good agreement with the test results. The equations and methods proposed in this study have high computational accuracy, and these can be applied to the cross-sectional M-Φ-P relationships and deformation calculation of damaged steel members.

scholarly journals Investigation of Human Errors in Emergency Department of Imam Khomeini Hospital Emergency Department of Jiroft Using Systematic Human Error Reduction and Prediction Approach

2021 ◽  
Author(s):  
Reza JAFARI NODOUSHAN ◽  
Khalil TAHERZADEH CHENANI ◽  
Mehdi NAKHAEE NEZHAD ◽  
Sepideh SHAHSAVARI
Keyword(s):  
Emergency Department ◽  
Human Error ◽  
Error Reduction ◽  
High Concentration ◽  
Emergency Nurses ◽  
Cross Sectional ◽  
Human Errors ◽  
Medical Careers ◽  
Prediction Approach ◽  
Action Errors

Introduction: In examining the unfortunate events that have taken place in the industrial and health sectors, human error is considered as the main cause of these events. Given the sensitivity and importance of medical careers, the occurrence of errors can lead to irreparable consequences. The purpose of this study was to investigate the human error in the emergency department of Imam Khomeini Hospital in Jiroft. Methods: This study was a cross-sectional and descriptive one. Emergency nurses' job duties have been analyzed by interviewing emergency nurses and studying nursing job guidelines and procedures using hierarchical task analysis. Finally, using the Systematic Human Error Reduction and Prediction Approach, human errors in nursing care were analyzed. Results: Generally, 4 tasks, 18 sub-tasks and 91 types of errors related to nursing activities were identified. Number of errors found, 27 (30%) Action errors, 18 (20%) Checking errors, 19 (21%) Retrieval errors, 12 (13%) communication errors, and 15 (16%) selection errors Were. As can be seen, the largest number of errors was related to the type of Action errors. Conclusion: Considering the results of the present study, the highest numbers of errors were related to Action and Checking errors respectively, which due to the sensitivity of nursing jobs and especially in the emergency department, require the use of highly skilled people to perform tasks that require high concentration and accuracy.

scholarly journals Assessment of Knowledge About Patient Safety Concepts Among Medical and Pharmacy Students

2021 ◽  
Author(s):  
Areeg Abumostafa ◽  
Fadwa Abu Mostafa ◽  
Khaled Al-Kattan ◽  
Rana Alkateb ◽  
Aljohara Alayesh ◽  
...  
Keyword(s):  
Patient Safety ◽  
Human Error ◽  
Cross Sectional Study ◽  
Pharmacy Students ◽  
Research Centre ◽  
Safety Education ◽  
Cross Sectional ◽  
Human Errors ◽  
School Year ◽  
Causes Of Errors

ABSTRACT Introduction Patient safety is a central principle of healthcare professional practice that requires a significant consideration within the teaching curricula; however, there is a lack of special courses that focus on patient safety concepts in an integrated way in many countries. This study aims to assess the knowledge of medical and pharmacy students regarding patient safety concepts. Methods A cross-sectional study was conducted at Alfaisal University during the 2018-2019 school year. A survey consisting of 15 questions was designed with the help of the quality and patient safety department at King Faisal Specialist Hospital and Research Centre, Riyadh (KFSHRC). The survey was validated and then electronically distributed to all students enrolled in the College of Medicine and College of Pharmacy. Results A total of 304 (22%) of 1368 students completed the survey. The survey revealed that 51% of students had an acceptable understanding of the types of human error; however, 53% of students had little knowledge about the factors that lead to these errors and 61% did not know how to report an error. Many students (41%) reported being directly involved in an unsafe situation that may cause patient harm, such as a healthcare-related error, adverse event, or inconsistent care. Most students (90%) agreed that hiding errors to avoid further implications is unethical and reporting errors is the responsibility of every healthcare provider. Conclusion Most Alfaisal University students understand the significance of patient safety education and understand the types of human errors, yet the causes of errors and the protocols for reporting them were not well understood by most students.

scholarly journals Identification and Evaluation of Human Error by Human Error Assessment and Reduction Technique Technique in Overhead Cranes Operators : A case study in a steel industy in Khuzestan

2020 ◽  
Author(s):  
Zeinab Alsadat Nezamodini ◽  
Behnoush Jafari ◽  
Seyd Amin Jazayeri
Keyword(s):  
Steel Industry ◽  
Human Error ◽  
Reduction Technique ◽  
Sleep Cycle ◽  
Main Role ◽  
Error Assessment ◽  
Cross Sectional ◽  
Probability Of Error ◽  
Human Errors ◽  
Overhead Cranes

Introduction: Studies in the field of industrial accidents show that human errors have the most important and main role in the occurrence of accidents. According to the literature, 60 to 90% of accidents occur due to the human errors and mistakes. Therefore, in this study, human errors among overhead cranes' operators working in steel industry were identified and analyzed by Human Error Assessment and Reduction Technique (HEART). Methods and Materials: This cross-sectional study examined the operators of overhead cranes in a steel industry in Khuzestan for 5 months. In this study, the tasks of the operators of 18 cabin control overhead cranes were analyzed by HTA method. Later, using the HEART method, the probability of human error for each task was calculated quantitatively. Results: The results showed that the most important contributors to human error in both types of cabin and pendant overhead cranes included failure to understand the risk, the operators' inadequate physical and mental conditions, and disruption of the normal sleep cycle.   Conclusion: Based on the results, it can be concluded that the HEART method was successful in ranking tasks due to the magnitude probability of errors. In order to reduce human error, the authorities are recommended to improve the employees' performance, prevent error caused by human factors, control strategies such as proper working guidelines, improve the quality of staff training, emphasize compliance with rules and regulations, plan regular work shifts, and develop programs to reduce the stress probability of error.

scholarly journals Identification and evaluation of human errors of Epoxy control room operators of a pipe Mill company using HEC technique

2022 ◽  
Author(s):  
GH Shirali ◽  
B Jafari ◽  
F Raoufian
Keyword(s):  
Human Error ◽  
Cross Sectional Study ◽  
Vital Role ◽  
Control Room ◽  
Cross Sectional ◽  
Human Errors ◽  
Factors Affecting ◽  
Job Tasks ◽  
Pipe Mill ◽  
Job Task

Introduction: In many workplaces today, the incidence of human error can lead to catastrophic accidents in which human error is the main cause of accidents. Due to the vital role of the control room in guiding and controlling various sites of the pipe industry, especially the outer coating sector, the incidence of any error can lead to human accidents, damage to machinery, interruption in production. This study aimed to identify and evaluate human error by Human Error Calculator (HEC) method in the epoxy control room of a pipe mill company.  Materials and Methods: In the present descriptive cross-sectional study, the HEC method was used to identify and evaluate human errors. The HEC technique is provided by Risk Map Company, in which the probability of human error is based on five factors affecting the occurrence of human error, including a degree of urgency, complexity, importance, degree of individual skill, and task repetition, using a disk-shaped tool called Risk Disk is determined through direct observation, available instructions and interview with the head of the mentioned unit. Results: According to the results of this study, out of 11 identified tasks, five job tasks with a risk number of 70% have a high probability of human error, four job tasks with a risk number of 50%, and one job task with a number There is a 40% risk of moderate human error, And a job task with a 20% risk number has an increased chance of human error. Conclusion: The results of the present study showed that the HEC method is easy to use and is a simple and useful tool for professionals to calculate the probability of human error. In addition, HEC is a practical, effective and beneficial method for managers to reduce human error.

Shear strength properties of plain and spirally profiled cable bolts

2015 ◽  
Vol 52 (10) ◽  
pp. 1490-1495 ◽  
Author(s):  
Naj Aziz ◽  
Ali Mirzaghorbanali ◽  
Jan Nemcik ◽  
Kay Heemann ◽  
Stefan Mayer
Keyword(s):  
Shear Strength ◽  
Testing Machine ◽  
Peak Load ◽  
Strength Properties ◽  
Shear Displacement ◽  
Vertical Shear ◽  
Cross Sectional ◽  
Cable Bolts ◽  
Strength Capacity ◽  
Cable Bolt

An experimental investigation into the performance of two 22 mm diameter, 60 t tensile strength capacity Hilti cable bolts in shear was conducted using the double-shear testing apparatus at the laboratory of the School of Civil, Mining and Environmental Engineering, Faculty of Engineering and Information Sciences, University of Wollongong. The tested cable bolts were (i) Hilti 19 wire HTT-UXG plain strand and (ii) Hilti 19 wire HTT-IXG spirally profiled (smaller cross-sectional area than the plain one) cable bolt, with indentation only on the surface of the outer strands. These cable bolts are of sealed wire construction type, consisting of an outer 5.5 mm diameter wire layer overlying the middle 3 mm diameter wire strands. Both layers are wrapped around a single solid 7 mm diameter strand wire core. The double-shearing test was carried out in 40 MPa concrete blocks, contained in concrete moulds. Cable bolts were encapsulated in concrete using Orica FB400 pumpable grout. Prior to encapsulation, each cable bolt was pre-tensioned initially to 50 kN axial force. A 500 t capacity servocontrolled compression testing machine was used for both tests, and during each test the vertical shear displacement was limited to 70 mm of travel. The rate of vertical shear displacement was maintained constant at 1 mm/min. The maximum shear load achieved for the plain strand cable was 1024 kN, while the spiral cable peak load was 904 kN, before the cable bolt wires began to individually snap, leading to the cable bolt break-up into two sections. It is apparent that spiral profiles of the outer wires weaken both the tensile and shearing strength. Finally, another set of tests was undertaken using the British Standard single-shear approach, producing lower shear strength values.

A Method for Marine Human Error Probability Estimate: APJE-SLIM

2011 ◽  
Vol 97-98 ◽  
pp. 825-830 ◽  
Author(s):  
Yong Tao Xi ◽  
Chong Guo
Keyword(s):  
Collision Avoidance ◽  
Human Error ◽  
Shipping Industry ◽  
Human Reliability ◽  
Combined Method ◽  
Probability Estimate ◽  
Human Errors ◽  
Performance Shaping Factors ◽  
Industry Research ◽  
Human Error Probability

Safety is the eternal theme in shipping industry. Research shows that human error is the main reason of maritime accidents. Therefore, it is very necessary to research marine human errors, to discuss the contexts which caused human errors and how the contexts effect human behavior. Based on the detailed investigation of human errors in collision avoidance behavior which is the most key mission in navigation and the Performance Shaping Factors (PSFs), human reliability of mariners in collision avoidance was analyzed by using the integration of APJE and SLIM. Result shows that this combined method is effective and can be used for the research of maritime human reliability.

Identification of Human Errors During Early Design Stage Functional Failure Analysis

2018 ◽  
Author(s):  
Lukman Irshad ◽  
Salman Ahmed ◽  
Onan Demirel ◽  
Irem Y. Tumer
Keyword(s):  
Failure Analysis ◽  
Human Error ◽  
System Level ◽  
Design Stage ◽  
Human Factors Engineering ◽  
Human Errors ◽  
Functional Failure ◽  
Early Design ◽  
Early Design Stage ◽  
Early Design Stages

Detection of potential failures and human error and their propagation over time at an early design stage will help prevent system failures and adverse accidents. Hence, there is a need for a failure analysis technique that will assess potential functional/component failures, human errors, and how they propagate to affect the system overall. Prior work has introduced FFIP (Functional Failure Identification and Propagation), which considers both human error and mechanical failures and their propagation at a system level at early design stages. However, it fails to consider the specific human actions (expected or unexpected) that contributed towards the human error. In this paper, we propose a method to expand FFIP to include human action/error propagation during failure analysis so a designer can address the human errors using human factors engineering principals at early design stages. To explore the capabilities of the proposed method, it is applied to a hold-up tank example and the results are coupled with Digital Human Modeling to demonstrate how designers can use these tools to make better design decisions before any design commitments are made.

scholarly journals Experimental Study on the Behavior of Tension Member Under Rupture

2021 ◽  
Keyword(s):  
Experimental Study ◽  
Tensile Force ◽  
Steel Structure ◽  
Steel Structures ◽  
Structural Members ◽  
Steel Members ◽  
Tension Member ◽  
Strong Relation ◽  
Almost All ◽  
Tension Members

Abstract. A steel structure is naturally lighter than a comparable concrete construction because of the higher strength and firmness of steel. Nowadays, the growth of steel structures in India is enormous. There are so many advantages in adopting the steel as structural members. Almost all high-rise buildings, warehouses & go-downs are steel structures and even some of the commercial buildings are made of steel. Tension members are the elements that are subjected to direct axial load which tends in the elongation of the structural members. Even today bolted connections play a major role in the connection of hot rolled structural steel members. In this experimental study the behavior of tension members (TM) such as plates, angles & channels have been studied under axial tensile force. There is strong relation between pitch and gauge (with in the specified limit as per IS 800:2007) in determining the rupture failure plane. In this study we intensively tested the behaviour of TM for different fasteners pattern by changing the pitch, gauge, end & edge distance and by adopting the different patterns or arrangements of bolted connection in it.

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