エスカレータートラス構造の復元力特性を考慮した振動解析モデルの構築

Abstract

In the 2011 off the Pacific coast of Tohoku Earthquake, four fall accidents of the escalators occurred. These accidents, the escalator that linked the third floor from second floor dropped, occurred in the commercial facilities of the low-rise, steel-frame building. In general, the escalator is installed with one side of the leg or both sides as non-fixed style in order not to restrict motion of the escalator. However, the escalator truss might come off from the beams of the building, because interlaminar deformation with more than assumption was caused in the building where the accident happened. In new public notice about the reinforcement of the falling off prevention structure of the escalator after these accidents, the structure that an escalator never fall off was determined, 1 Structure to make enough overlap allowance, 2 Structure to take backup measures for. To make enough overlap allowance for, the escalator truss come off from the beam of building and is less likely to drop. However, it is considered that a non-fixed part collides with the beam of building by the big rolling of the earthquake; the collision may give compression and residual displacement to the escalator. From the above-mentioned background, the object of this research is to construct of an analytical model grasping behavior at earthquake for an escalator, which considered collision with the beam of building. In this paper, I perform earthquake response analysis in using the restoring force characteristics model, was built by the compression experimental value using the escalator truss of the original size, and Bi-linear model in this study until now, and I examine behavior at an earthquake for an escalator.