地震時のロッキングを考慮したクレーンの挙動検討

抄録

We experienced much damage to travelling type cranes in the 1995 Hyogoken-Nanbu earthquakes such as derailment, bending failure of legs and collapse by the rocking motion. This paper presents a method of evaluating the strength of the structural part of the travelling crane against earthquakes taking the rocking motion into consideration. Formulas proposed for the evaluation are derived from a study of the behavior of a simple model based on its deformation and response periods of the rocking motion of the rigid body. Numerical calculation results from these formulas are found to coincide satisfactorily with that from a nonlinear transient response by FEM analysis.