A New Type of Bridge, Mobilebridge&amp;#174; to Super-Quickly Recover a Bridge

Yuki Chikahiro,Ichiro Ario

doi:10.4236/wjet.2015.33c025

Abstract

Many natural disasters cause not only critical situations for facilities and resident’s residents’ life, but also significant damage to economy. It is obvious that quick rescue action must be undertaken and that there are many problems due to the occurrence of secondary disasters at rescue worksite. Basing Based on the previous study of deployable structures and the concept of the multi-folding micro-structures, we propose a new type of foldable bridge in form of scissor structure called the Mobile-bridge?. In this paper, we discuss the vehicle passing test performed on the real-scale Mobile-bridge in order to evaluate its mechanical characteristics and application limits. Moreover, we verified the compatibility between the result of calculations and experiments by means of theoretical modelling. The results show that it is sufficient to treat the load as equivalent nodal forces applied at the joints without including the stiffness of the deck.

Highlights

In recent years, the world has seen many kinds of natural disasters such as earthquakes, floods and tsunamis
In a case of our floods investigation, many residents suffered from bridge and road damage caused by very strong rains along several river branches in the northern Kyushu of Japan in 2012
Based on the previous study of the previous study of deployable structures and the concept of the multi-folding micro-structures [1]-[4], we propose a new type of emergency bridge-the MobilebridgeTM which can expand and store for concrete disaster recovery system [5]

Summary

Introduction

The world has seen many kinds of natural disasters such as earthquakes, floods and tsunamis. The joint which connects the members of scissors is a pin-junction in form of a flexible hinge, and the pin joining sections called a “pivot” which exists in the central portion of a scissors member intersect. Provides several advantages: 1) even if there are few members for constructing, deployment and storage work are quickly, 2) assembling, transportation and disassembling is easy 3) it has high deployment performance because the scissors structure can deploy and store all units by one control force,. We verify the compatibility between the result of analysis, and experiments by means of theoretical approach

Outline of the Real-Scaled Mobilebridge

Mechanics of a Unit Scissors Structure

Mechanics of a Scissors Structure in the Consideration of Deck

Outline of the Aluminum Alloy Deck

Experiment Conditions

Experimental Results

Distribution of the Stress in the Central Cross-Section Position

Vehicles Outline

Vehicles Stop Position and Loading Condition

Results of the Experiment

Conclusions