American Society of Civil Engineers


Analyses of Instability in Mobile Cranes due to Ground Penetration by Outriggers


by Satoshi Tamate, (Sr. Researcher, Constr. Safety Res. Group, Natl. Inst. of Industrial Safety (NIIS), 1-4-6 Umezono, Kiyose, Tokyo 204-0024, Japan), Naoaki Suemasa, (Assoc. Prof., Dept. of Civ. Engrg., Fac. of Engrg., Musashi Inst. of Technol., 1-28-1 Tamazutsumi, Setagaya-ku, Tokyo 158-8557, Japan), and Toshiyuki Katada, (Prof., Dept. of Civ. Engrg., Fac. of Engrg., Musashi Inst. of Technol., 1-28-1 Tamazutsumi, Setagaya-ku, Tokyo 158-8557, Japan)

Journal of Construction Engineering and Management, Vol. 131, No. 6, June 2005, pp. 689-704, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9364(2005)131:6(689))

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Document type: Journal Paper
Abstract: This study focuses on the phenomenon of ground instability causing mobile cranes to overturn. Four outriggers usually support a mobile crane in order to restrict pitching during hoisting operations. Nevertheless, the crane may become quite unstable if the outriggers should happen to sink into the bearing ground. In this paper, various types of analysis, including experiments, were performed in order to investigate the influence of ground penetration by outriggers on the stability of mobile cranes. Through study of the results of experimentation and simulation, it has been clarified that mobile cranes become highly unstable as a result of rapid penetration. It was found that an index of relative instability had a linear relationship to the common logarithm of an index for brittle failure as derived from the load–settlement curve for ground penetration. Finally, a method of evaluating the risk of mobile-crane overturning is proposed by using the maximum value of both the supporting surface’s failure risk and the kinetic risk due to ground penetration.


ASCE Subject Headings:
Brittle failures
Centrifuge models
Cranes
Load bearing capacity
Numerical analysis
Safety
Stability