Kiyoshi Asanuma

Development of Silent Steel Railway Bridge Equipped with Floating Ladder Track and Floating Reinforced Concrete Deck

As a countermeasure against structure-borne noise of steel railway bridge, we developed a new type silent steel railway bridge equipped with floating ladder track and floating reinforced concrete deck. As a result of the train running test, it was apparent that the new steel railway bridge with double floating system has reduced vibration velocity level of 10.5dB(A) at the main girder webs as compared with a steel railway bridge which has directly fastened tracks.

Experimental Study on Contact Force between a Train Wheel and a Prestressed Concrete Sleeper

This paper describes the static and the impact experiments using a wheel shaped contact shoe and prestressed concrete sleepers (PC sleeper) to simulate the phenomenon that train wheels are expected to collide with PC sleepers when a railway vehicle is derailed by a large-scale earthquake. These experiments clarified the following items: firstly, the maximum force obtained in the static and the impact experiments were almost equal except for the case of loading at the edge side in the longer direction of the sleeper. Secondary, regarding fracture mode, it became clear that flexure fracture, delamination fracture or shear fracture could be classified, not by the loading method but by the loading position. Thirdly, regarding contact stiffness, it differs according to the loading method and loading position.