DEVELOPMENT OF SIMPLE AND EASY ASSEMBLING TIMBER TRUSS BRIDGE

Abstract

 The authors are developing a timber truss bridge as an emergency bridge for life saving and transportation of daily necessities. It is possible that the assembling the bridge by hands and quickly is executed. Long term durability is not necessary because this bridge will be used temporarily for only recovery time. In the Warren truss bridge developed as emergency bridge in 2010, there was a problem of heat strain by welding in the steel connection plates. In another Warren truss bridge developed in 2019, the problem was removed without welding, however, deformation and vibration for the direction perpendicular to bridge axis occurred easily. To improve these problems, this study develops the bridge with the following characteristics ; (1) Using two steel plates with 3.2mm thickness for the connection, (2) Attaching the portal members to the intermediate part of the bridge as well as the end part of the bridge. (3) Using connection plates with folding processing, not welding processing.As the results, the bridge developed here became light and simple, and the construction time was only 3 hours and 8 minutes.