Some Aspects of Overturning Mechanisms of Pile Driving Machine on Soft Foundation
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361
130
American Journal of Civil Engineering (Science Publishing Group)
2022
World
English
Japan, USA
Abstract
Many overturning accidents of cranes and pile driving machines have occurred in recent years. Overturning mechanisms of those accidents have been studied by the author, et al., based on theory of structural stability by using the rotational spring-rigid bar model. A summary of the theoretical study is first described in this paper including the concept of the structural stability, the category of the overturning mechanisms and the preliminary model test. Then, using the same structural model, the computer structural analysis, in which software TDAPIII (Time-domain Dynamic Analysis Program in 3-dimension) is used, is explained in order to compare with the previous theoretical study. Consequently, the computer analysis confirms a good coincidence with the theoretical results. Further, by the computer analysis, the effect of the rotational stiffness of the foundation and the eigenvalue analysis to find the critical load are studied. In general, the computer analysis is a more practical tool to study the overturning mechanism than the theoretical analysis which is based on the equilibrium equations. The computer analysis would be possible to consider the material non-linearity of the foundation and 3-dimensional effect. In order to avoid this kind of overturning accident in the future, the results in this paper will give useful information to study further in details.
Overturning Mechanism, Pile Driving Machine, Crane, Structural Stability, Soft Foundation, Computer Structural Analysis, Effect of Initial Imperfections
Many overturning accidents of cranes and pile driving machines have occurred in recent years. Overturning mechanisms of those accidents have been studied by the author, et al., based on theory of structural stability by using the rotational spring-rigid bar model. A summary of the theoretical study is first described in this paper including the concept of the structural stability, the category of the overturning mechanisms and the preliminary model test. Then, using the same structural model, the computer structural analysis, in which software TDAPIII (Time-domain Dynamic Analysis Program in 3-dimension) is used, is explained in order to compare with the previous theoretical study. Consequently, the computer analysis confirms a good coincidence with the theoretical results. Further, by the computer analysis, the effect of the rotational stiffness of the foundation and the eigenvalue analysis to find the critical load are studied. In general, the computer analysis is a more practical tool to study the overturning mechanism than the theoretical analysis which is based on the equilibrium equations. The computer analysis would be possible to consider the material non-linearity of the foundation and 3-dimensional effect. In order to avoid this kind of overturning accident in the future, the results in this paper will give useful information to study further in details.
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