Fiberglass and Aluminum Step Ladder Performance Under Dynamic Loading Conditions

Glancey, James L.; Snyder, G. A.; Vinson, Jack R.; Krisher, James A.; Franklin, Philip A.

doi:10.13031/2013.19534

Cited by 2 publications

(2 citation statements)

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“…This argument implies that any ladder that meets the American National Standards Institute (ANSI) safety standard (excepting when a manufacturing defect exists) is impervious to accidents unless they are caused by climber misuse. This paper refutes this argument and notes that a careful reading of the standards promulgated by ANSI concerning ladder safety (American Society of Safety Engineers 1992Engineers , 1994Engineers , 2000 reveals that there is little attempt to link ladder performance and the design verification tests to the many ways in which ladders are typically used (Glancey et al 2003(Glancey et al , 2005.…”

Section: Safety Standardsmentioning

confidence: 85%

Analysis and testing of a hidden stepladder hazard – excessive twist flexibility

Seluga¹,

Ojalvo²,

Obert³

2007

International Journal of Injury Control and Safety Promotion

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Accidental falls from stepladders are responsible for tens of thousands of injuries in the US each year. This paper augues recent research concerning excessive stepladder twist flexibility, which can lead to ladder falls. Such falls can easily occur when only three of a ladder's four legs are in contact with the ground and an unknowing climber shifts his weight, causing the ladder's raised leg to move suddenly downward and the climber to lose his balance. The static and dynamic test and analysis results presented show a major cause of this hazard, its effect on climbers and the influence of ladder design on the likelihood of its occurrence. The inadequacy of existing stepladder safety standards to protect against such accidents is noted and a call for a new testing standard is outlined. It would be prudent to develop and implement a new racking test and stiffer ladder twist requirements to reduce the likelihood of inadvertent ladder racking.

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Section: Safety Standardsmentioning

confidence: 85%

Analysis and testing of a hidden stepladder hazard – excessive twist flexibility

Seluga¹,

Ojalvo²,

Obert³

2007

International Journal of Injury Control and Safety Promotion

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“…The effect of the dynamic factors is illustrated for ratios of 2.5 to 1.75 and 2 to 1.5 are used in the simulation [19]. As the worker climbs the ladder towards the rung 13, these four parameters increase.…”

Section: Effect Of Dynamic Factorsmentioning

confidence: 99%

Failure Analysis of an Aluminum Extension Portable Ladder

Bouzid¹

2014

MSA

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The conditions of end supports of straight ladders are often the cause of major injuries. The firm and secure ladder ends against instability in general and sliding of the top and bottom ends in particular are among the check list of most ladder safety training books and manuals. However, the restraint to the free expansion of a ladder can cause a catastrophic failure due to buckling even at intermediate loads and should be presented in the latter as a serious potential hazard. This paper deals with an investigation of an extension. An analytical structural model that simulates the buckling behavior of an axially restrained ladder subjected to static and dynamic loading is developed. It compares two different ladder end conditions and shows that instability due to buckling can occur during ascension or descent in the case of an axially restrained ladder. The analytical results are supported and validated by a finite element model simulation conducted in parallel. This study may explain the root cause of similar incidents involving falls from portable ladders worldwide.

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Fiberglass and Aluminum Step Ladder Performance Under Dynamic Loading Conditions

Cited by 2 publications

References 0 publications

Analysis and testing of a hidden stepladder hazard – excessive twist flexibility

Analysis and testing of a hidden stepladder hazard – excessive twist flexibility

Failure Analysis of an Aluminum Extension Portable Ladder

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